TY - JOUR A1 - Dittmar, Paul A1 - Voigtsberger, Paul A1 - Conrad, Dietrich T1 - Entwicklung und Anwendung eines Verfahrens zur Ermittlung der Zündgrenzen brennbarer Gase und Dämpfe in Mischung mit Luft oder Sauerstoff PY - 1965 SN - 0003-7788 IS - 3 SP - 58 EP - 63 PB - Kohlhammer CY - Stuttgart AN - OPUS4-10447 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Dietrich, Paul A1 - Horlacher, T. A1 - Girard-Lauriault, P.-L. A1 - Gross, Thomas A1 - Lippitz, Andreas A1 - Min, H. A1 - Wirth, Thomas A1 - Castelli, R. A1 - Seeberger, P. H. A1 - Unger, Wolfgang T1 - Carbohydrate-functionalized surfaces: Analysis by a multi-method approach T2 - 6. Senftenberger Innovationsforum: Multiparameteranalytik mit zellulären Assays CY - Senftenberg, Germany DA - 2012-03-16 PY - 2012 AN - OPUS4-25683 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Dietrich, Paul A1 - Funk, Ch. A1 - Gross, Thomas A1 - Weigel, W. A1 - Unger, Wolfgang T1 - Epoxy-functionalized Surfaces: Surface chemical analysis and fluorescence labeling of surface species T2 - 6. Senftenberger Innovationsforum: Multiparameteranalytik mit zellulären Assays CY - Senftenberg, Germany DA - 2012-03-16 PY - 2012 AN - OPUS4-25684 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Dietrich, Paul A1 - Unger, Wolfgang T1 - How successful is surface chemical analysis in the characterization of (model) diagnostic devices exploiting probe-target interaction? T2 - 65th IUVSTA Workshop "Measuring molecular adsorption at the solid liquid interface" CY - Peckforton, England DA - 2012-05-14 PY - 2012 AN - OPUS4-25968 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Funk, C. A1 - Dietrich, Paul A1 - Gross, Thomas A1 - Min, Hyegeun A1 - Unger, Wolfgang A1 - Weigel, W. T1 - Epoxy-functionalized surfaces for microarray applications: surface chemical analysis and fluorescence labeling of surface species N2 - Methods for characterization of epoxy-functionalized substrates used for microarray applications, prepared by silanization with 3-glycidoxypropyltrimethoxysilane, have been developed. Contact angle measurements, X-ray photoelectron spectroscopy, time of flight secondary ion mass spectrometry and fluorescence based methods have been applied to investigate these epoxy-functionalized microarray substrates. The surface density of epoxy-functionalized glass slides was investigated by fluorescence labeling of surface species utilizing Rhodamine 110 as fluorescence probe. KW - Epoxy silane KW - Microarrays KW - Fluorescence KW - XPS KW - ToF-SIMS KW - Surface analysis PY - 2012 U6 - https://doi.org/10.1002/sia.3856 SN - 0142-2421 SN - 1096-9918 VL - 44 IS - 8 SP - 890 EP - 894 PB - Wiley CY - Chichester AN - OPUS4-26342 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Girard-Lauriault, P.-L. A1 - Dietrich, Paul A1 - Gross, Thomas A1 - Wirth, Thomas A1 - Unger, Wolfgang T1 - Chemical characterization of the long-term ageing of nitrogen-rich plasma polymer films under various ambient conditions N2 - Nitrogen rich plasma polymer films (L-PPE:N) were prepared by low-pressure RF plasma using a 1:1 mixture of ethylene and ammonia and aged for 345 d in four different ambient conditions: (i) at room temperature (RT) in air; (ii) at RT in nitrogen; (iii) at -20?°C in air and; (iv) at –20 °C in nitrogen. The films were analyzed by X-ray photoelectron spectroscopy (XPS) and by time-of-flight secondary ion mass spectrometry (ToF-SIMS) at various intervals over the duration of the experiment. The ageing of primary amines, NH2, was followed by chemical derivatization with 4-trifluoromethyl benzaldehyde. Storage at –20 °C, mostly independently of ambient atmosphere, slowed down ageing to almost undetectable levels as evaluated by the analytical methods used for this study. KW - Ageing KW - Plasma polymers KW - Primary amines KW - ToF-SIMS KW - XPS PY - 2013 U6 - https://doi.org/10.1002/ppap.201200118 SN - 1612-8850 SN - 1612-8869 VL - 10 IS - 4 SP - 388 EP - 395 PB - Wiley-VCH Verl. CY - Weinheim AN - OPUS4-28006 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Dietrich, Paul A1 - Gross, Thomas A1 - Horlacher, T. A1 - Girard-Lauriault, Pierre-Luc A1 - Lippitz, Andreas A1 - Min, Hyegeun A1 - Wirth, Thomas A1 - Castelli, R. A1 - Seeberger, P.H. A1 - Unger, Wolfgang T1 - Surface analytical investigations (XPS, NEXAFS and ToF-SIMS) of carbohydrate-functionalized surfaces T2 - SIMS XVIII, 18th International Conference on Secondary Ion Mass Spectrometry CY - Trento, Italy DA - 2011-09-18 PY - 2011 AN - OPUS4-24445 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Dietrich, Paul A1 - Horlacher, T. A1 - Girard-Lauriault, Pierre-Luc A1 - Gross, Thomas A1 - Lippitz, Andreas A1 - Min, Hyegeun A1 - Wirth, Thomas A1 - Castelli, R. A1 - Seeberger, P. H. A1 - Unger, Wolfgang T1 - Surface chemical characterization of carbohydrate films on gold T2 - ECASIA '11 CY - Cardiff, Wales DA - 2011-09-09 PY - 2011 AN - OPUS4-24239 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Dietrich, Paul A1 - Funk, Christian A1 - Gross, Thomas A1 - Unger, Wolfgang A1 - Weigel, W. T1 - Epoxy-functionalized Surfaces: Surface chemical analysis and fluorescence labeling of surface species T2 - ECASIA '11 CY - Cardiff, Wales DA - 2011-09-09 PY - 2011 AN - OPUS4-24242 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Dietrich, Paul A1 - Horlacher, T. A1 - Gross, Thomas A1 - Castelli, R. A1 - Wirth, Thomas A1 - Seeberger, P. H. A1 - Unger, Wolfgang T1 - Surface chemical Analysis of Microarrays: Problems and Perspectives T2 - ECASIA'11 CY - Cardiff, Wales DA - 2011-09-09 PY - 2011 AN - OPUS4-24243 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Dietrich, Paul A1 - Horlacher, T. A1 - Girard-Lauriault, Pierre-Luc A1 - Gross, Thomas A1 - Lippitz, Andreas A1 - Min, Hyegeun A1 - Wirth, Thomas A1 - Castelli, R. A1 - Seeberger, P. A1 - Unger, Wolfgang T1 - Multimethod chemical characterization of carbohydrate-functionalized surfaces N2 - A combined XPS, NEXAFS, and ToF-SIMS chemical surface characterization of carbohydrate-functionalized gold and glass surfaces is presented. Spot shape and chemical composition across a spot surface are provided by surface-sensitive methods as ToF-SIMS and XPS, used in their imaging modes. Moreover, the feasibility of this multimethod approach to control relevant production steps of a carbohydrate microarray prototype is demonstrated. KW - Carbohydrates KW - Microarrays KW - Self-assembled monolayers KW - XPS KW - NEXAFS KW - ToF-SIMS PY - 2011 U6 - https://doi.org/10.1080/07328303.2011.615181 SN - 0732-8303 VL - 30 IS - 4-6 SP - 361 EP - 372 PB - Taylor & Francis CY - London [u.a.] AN - OPUS4-24874 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Dietrich, Paul A1 - Horlacher, T. A1 - Gross, Thomas A1 - Castelli, R. A1 - Wirth, Thomas A1 - Seeberger, P. H. A1 - Unger, Wolfgang T1 - Microarrays - Surface Chemical Characterization T2 - Functional Genomics and Proteomics - Applications, Molecular Diagnostics & Next Generation Sequencing CY - Frankfurt am Main, Germany DA - 2012-02-02 PY - 2012 AN - OPUS4-25529 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Song, X. A1 - Ma, Y. A1 - Wang, C. A1 - Dietrich, Paul A1 - Unger, Wolfgang A1 - Luo, Y. T1 - Effects of protonation, hydrogen bonding, and photodamaging on X-ray spectroscopy of the amine terminal group in aminothiolate monolayers N2 - The amine headgroup, NH2, in aminothiolate monolayers can often generate unexpectedly rich structures in its N K-edge X-ray photoelectron spectra (XPS) and near-edge X-ray absorption fine structure (NEXAFS) spectra that are difficult to assign. We have carried out density functional theory (DFT) calculations to study the XPS and NEXAFS of amine headgroup in four different aminothiolate monolayers, namely, aliphatic 11-aminoundecane-1-thiol (AUDT), aromatic 4-aminobenzenethiol (ABT), araliphatic 4-aminophenylbutane-1-thiol (APBT), and 3-(4''-amino-1,1':4',1''-terphenyl-4-yl)propane-1-thiol (ATPT), with the focus on structure changes caused by protonation, hydrogen bonding, and X-ray damaging. Spectra of all possible saturated and unsaturated species, as well as X-ray damage products, such as imine, nitrile, azo species, and cumulative double bonds, have been thoroughly examined. It is found that extra spectral structures observed in the experimental XPS spectra do not result from protonation but from the formation of a primary ammonium. The X-ray excitation can induce cross-linking between two neighboring molecules to form different complexes that contribute to the π* features in NEXAFS spectra. KW - Surface analysis KW - Spectrum simulation KW - X-ray absorption spectroscopy KW - Self assembling monolayer PY - 2012 U6 - https://doi.org/10.1021/jp302716w SN - 1932-7447 SN - 1089-5639 VL - 116 IS - 23 SP - 12649 EP - 12654 PB - Soc. CY - Washington, DC AN - OPUS4-26255 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Girard-Lauriault, Pierre-Luc A1 - Dietrich, Paul A1 - Gross, Thomas A1 - Unger, Wolfgang T1 - Is quantitative chemical derivatization XPS of plasma deposited organic coatings a valid analytical procedure? N2 - Functionalized organic layers prepared by plasma processes have complex surface chemistries. The problem of elucidating such chemistries is an extensively studied subject. One of the preponderant methods used to acquire information on specific functional groups is chemical derivatization XPS. In this communication, we focus on rather popular chemical derivatization XPS approaches, for instance, the quantification of amines with 4-trifluoromethyl benzaldehyde and of hydroxyl groups with trifluoroacetic anhydride. Although these procedures have been used for a long period by various laboratories, the use of varying protocols is obvious. Comparison of results is therefore difficult. We discuss steps toward a valid experimental procedure, in particular, the calculation of concentrations, the preparation of test samples, the pitfalls, and the shortcomings. KW - Organic coatings KW - Amine KW - Alcohol KW - Chemical derivatization KW - XPS PY - 2012 U6 - https://doi.org/10.1002/sia.4947 SN - 0142-2421 SN - 1096-9918 VL - 44 IS - 8 SP - 1135 EP - 1140 PB - Wiley CY - Chichester AN - OPUS4-26234 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Darlatt, Erik A1 - Nefedov, A. A1 - Traulsen, C.H.-H. A1 - Poppenberg, J. A1 - Richter, S. A1 - Dietrich, Paul A1 - Lippitz, Andreas A1 - Illgen, René A1 - Kühn, Julius A1 - Schalley, C.A. A1 - Wöll, Ch. A1 - Unger, Wolfgang T1 - Interperetation of experimental N K NEXAFS of azide, 1,2,3-triazole and terpyridyl groups by DFT spectrum simulations N2 - Experimental N K-edge NEXAFS data of surface immobilized azide, 1,2,3-triazole and terpyridyl groups are interpreted with the help of DFT spectrum simulations. Assignments of π* resonances in experimental N K-edge NEXAFS spectra to nitrogen atoms within these functional groups have been made. The azide was immobilized on gold as the head group of a thiol SAM, 1,2,3-triazole was formed on this SAM by click reaction and terpyridyl groups were introduced as substituents of the acetylene used for the click reaction. For azide-terminated molecules, DFT spectrum simulations are found to be useful to find measurement conditions delivering experimental N K-edge NEXAFS data with negligible X-ray damage. The 1,2,3-triazole group is found to be rather stable under X-ray irradiation. KW - N K-edge NEXAFS KW - XANES KW - Surface click chemistry KW - Density functional theory KW - Azide KW - 1,2,3-Triazole PY - 2012 U6 - https://doi.org/10.1016/j.elspec.2012.09.008 SN - 0368-2048 SN - 1873-2526 VL - 185 IS - 12 SP - 621 EP - 624 PB - Elsevier CY - Amsterdam AN - OPUS4-27774 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Hecht, Mandy A1 - Fischer, Tobias A1 - Dietrich, Paul A1 - Kraus, Werner A1 - Descalzo López, Ana Belén A1 - Unger, Wolfgang A1 - Rurack, Knut T1 - Fluorinated Boron-Dipyrromethene (BODIPY) dyes: bright and versatile probes for surface analysis N2 - A family of bright boron-dipyrromethene-type fluorophores with a high number of fluorine atoms (F-BODIPYs) has been developed and characterized by X-ray crystallography and optical spectroscopy. The introduction of 3,5-bis(trifluoromethyl)phenyl and pentafluorophenyl moieties significantly enhances the photostability of such dyes, yielding for instance photostable near-infrared (NIR) fluorophores that show emission maxima>750 nm, when the BODIPY's π system is extended with two (dimethylamino)styryl and (dimethylamino)naphthastyryl moieties, or green-emitting BODIPYs with fluorescence quantum yields of unity. When equipped with a suitable group that selectively reacts for instance with amines, F-BODIPYs can be used as potent dual labels for the quantification of primary amino groups on surfaces by X-ray photoelectron spectroscopy (XPS) and fluorescence, two powerful yet complementary tools for the analysis of organic surface functional groups. The advantage of reactive F-BODIPYs is that they allow a fast and non-destructive mapping of the labelled supports with conventional fluorescence scanners and a subsequent quantification of selected areas of the same sample by the potentially traceable XPS technique. The performance is exemplarily shown here for the assessment of the amino group density on SiO2 supports, one of the most common reactive silica supports, in particular, for standard microarray applications. KW - Amino groups KW - Dyes KW - Fluorescence KW - Surface analysis KW - X-ray photoelectron spectroscopy KW - Amino-Gruppen KW - Farbstoffe KW - Fluoreszenz KW - Oberflächenanalytik KW - Röntgen-Photoelektronen-Spektroskopie PY - 2013 U6 - https://doi.org/10.1002/open.201200039 SN - 2191-1363 VL - 2 IS - 1 SP - 25 EP - 38 PB - Wiley-VCH-Verl. CY - Weinheim AN - OPUS4-27783 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Voigtsberger, Paul A1 - Conrad, Dietrich T1 - Sicherheitstechnische Untersuchungen an Hydraulikölen und Verdichterschmierstoffen PY - 1965 SN - 0340-9481 IS - 9 SP - 329 EP - 333 PB - Schmidt CY - Berlin AN - OPUS4-10449 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Voigtsberger, Paul A1 - Conrad, Dietrich T1 - Sicherheitstechnische Untersuchungen an Druckzerstäuberdosen PY - 1965 SN - 0003-7788 IS - 11 SP - 304 EP - 311 PB - Kohlhammer CY - Stuttgart AN - OPUS4-10450 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Dietrich, Paul A1 - Nietzold, Carolin A1 - Gross, Thomas A1 - Wirth, Thomas A1 - Holzweber, Markus A1 - Panne, Ulrich A1 - Unger, Wolfgang A1 - Weigel, W. T1 - Characterization of lectin carbohydrate interactions by XPS and NEXAFS T2 - ECASIA´13 - 15th European Conference on Applications of Surface and Interface Analysis 2013 CY - Cagliari, Italy DA - 2013-10-13 PY - 2013 AN - OPUS4-29578 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Dietrich, Paul A1 - Unger, Wolfgang T1 - Charakterisierung von Microarrays durch Anwendung physikalischer Methoden der chemischen Oberflächenanalytik KW - Oberflächenmodifizierungen KW - Self-assemblierende Monolagen KW - Thiole KW - Aminierte Oberflächen KW - Microarrays KW - XPS KW - ToF-SIMS PY - 2010 UR - http://www.analytik-news.de/Fachartikel/Volltext/BAM1.pdf SP - 1 EP - 11 PB - Dr. Beyer Internet-Beratung CY - Ober-Ramstadt AN - OPUS4-21834 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Dietrich, Paul A1 - Horlacher, T. A1 - Girard-Lauriault, Pierre-Luc A1 - Gross, Thomas A1 - Lippitz, Andreas A1 - Min, Hyegeun A1 - Wirth, Thomas A1 - Castelli, R. A1 - Seeberger, P.H. A1 - Unger, Wolfgang T1 - Adlayers of dimannoside thiols on gold: surface chemical analysis N2 - Carbohydrate films on gold based on dimannoside thiols (DMT) were prepared, and a complementary surface chemical analysis was performed in detail by X-ray photoelectron spectroscopy (XPS), time-of-flight secondary ion mass spectrometry (ToF-SIMS), near-edge X-ray absorption fine structure (NEXAFS), FT-IR, and contact angle measurements in order to verify formation of ω-carbohydrate-functionalized alkylthiol films. XPS (C 1s, O 1s, and S 2p) reveals information on carbohydrate specific alkoxy (C–O) and acetal moieties (O–C–O) as well as thiolate species attached to gold. Angle-resolved synchrotron XPS was used for chemical speciation at ultimate surface sensitivity. Angle-resolved XPS analysis suggests the presence of an excess top layer composed of unbound sulfur components combined with alkyl moieties. Further support for DMT attachment on Au is given by ToF-SIMS and FT-IR analysis. Carbon and oxygen K-edge NEXAFS spectra were interpreted by applying the building block model supported by comparison to data of 1-undecanethiol, poly(vinyl alcohol), and polyoxymethylene. No linear dichroism effect was observed in the angle-resolved C K-edge NEXAFS. KW - Carbohydrates KW - Self-assembled monolayer KW - XPS KW - NEXAFS KW - ToF-SIMS KW - Surface chemical analysis PY - 2011 U6 - https://doi.org/10.1021/la104038q SN - 0743-7463 SN - 1520-5827 VL - 27 IS - 8 SP - 4808 EP - 4815 PB - American Chemical Society CY - Washington, DC AN - OPUS4-23554 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Dietrich, Paul A1 - Horlacher, T. A1 - Gross, Thomas A1 - Wirth, Thomas A1 - Castelli, R. A1 - Shard, A.G. A1 - Alexander, M. A1 - Seeberger, P. H. A1 - Unger, Wolfgang T1 - Optimization of the performance of carbohydrate microarrays by surface chemical analysis T2 - 12th Status Seminar "Chip Technologies, Sequencing and Functional Genomics" der DECHEMA e. V. CY - Frankfurt am Main, Germany DA - 2010-02-04 PY - 2010 AN - OPUS4-20806 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Dietrich, Paul A1 - Graf, Nora A1 - Gross, Thomas A1 - Lippitz, Andreas A1 - Schüpbach, B. A1 - Bashir, A. A1 - Wöll, Ch. A1 - Terfort, A. A1 - Unger, Wolfgang T1 - Self-assembled monolayers of aromatic omega-aminothiols on gold: surface chemistry and reactivity N2 - Amino-terminated self-assembled monolayers on gold substrates were studied by X-ray photoelectron spectroscopy (XPS), near-edge X-ray absorption fine structure (NEXAFS) measurements, and atomic force microscopy (AFM). Two different ω-amino-4,4'-terphenyl substituted alkanethiols of the general structure H2N-(C6H4)3-(CH2)n-SH (ATPn) were used: 2-(4''-amino-1,1':4',1''-terphenyl-4-yl)ethane-1-thiol (n = 2, ATP2) and 3-(4''-amino-1,1':4',1''-terphenyl-4-yl)propane-1-thiol (n = 3, ATP3). Moreover, the addressability of amino groups within the films was investigated by chemical derivatization of ATPn SAMs with 3,5-bis(trifluoromethyl)phenyl isothiocyanate (ITC) forming fluorinated thiourea ATPn-F films. Evaluation of high-resolution C 1s and N 1s XPS data revealed successful derivatization of at least 50% of surface amino species. Furthermore, it could be demonstrated by angle-resolved NEXAFS spectroscopy that chemical derivatization with ITC has no noticeable influence on the preferential upright orientation of the molecules in the SAMs. KW - Gold KW - Self-assembled monolayer KW - Thiols KW - Amino surfaces KW - XPS KW - NEXAFS PY - 2010 U6 - https://doi.org/10.1021/la903293b SN - 0743-7463 SN - 1520-5827 VL - 26 IS - 6 SP - 3949 EP - 3954 PB - American Chemical Society CY - Washington, DC AN - OPUS4-20990 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Dietrich, Paul A1 - Unger, Wolfgang T1 - Surface chemical analysis for the characterization of (bio)interfaces for diagnostic devices T2 - IUVSTA ECM 114 Highlight Seminar CY - Bratislava, Slovakia DA - 2012-10-01 PY - 2012 AN - OPUS4-27157 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Min, Hyegeun A1 - Girard-Lauriault, Pierre-Luc A1 - Gross, Thomas A1 - Lippitz, Andreas A1 - Dietrich, Paul A1 - Unger, Wolfgang T1 - Ambient-ageing processes in amine self-assembled monolayers on microarray slides as studied by ToF-SIMS with principal component analysis, XPS, and NEXAFS spectroscopy N2 - We investigated the ageing of amine-terminated self-assembled monolayers (amine-SAMs) on different silica substrates due to exposure to different ambient gases, pressures, and/or temperatures using time-of-flight secondary ion mass spectrometry (ToF-SIMS) with principal component analysis and complementary methods of surface analysis as X-ray photoelectron spectroscopy (XPS) and near edge X-ray absorption fine structure (NEXAFS). The goal of this study is to examine the durability of primary amine groups of amine-SAMs stored in a user laboratory prior to being used as supports for biomolecule immobilization and other applications. We prepared amine-SAMs on the native oxides of silicon wafers and glass slides using 3- aminopropyl triethoxysilane, by using optimized conditions such as anhydrous organic solvent and reaction time scale of hours to avoid multilayer growth. Selected commercial amine-SAM slides have been investigated, too. When the amine-SAMs are exposed to air, oxygen incorporation occurs, followed by formation of amide groups. The formation of oxygen species due to ageing was proved by ToFSIMS, XPS, and NEXAFS findings such as CNO- secondary ion emission at m/z 42, observation of the N 1s HNC=O component peak at 400.2–400.3 eV in XPS, and, last but not least, by formation of a π*(HNC=O) resonance at 401 eV in the N K-edge X-ray absorption spectrum. It is concluded that the used multi-method approach comprising complementary ToF-SIMS, XPS, and NEXAFS analyses is well suited for a thorough study of chemical aspects of ageing phenomena of amine-SAM surfaces. KW - Amine-SAM KW - Ageing process KW - ToF-SIMS KW - NEXAFS KW - XPS PY - 2012 U6 - https://doi.org/10.1007/s00216-012-5862-5 SN - 1618-2642 SN - 1618-2650 VL - 403 IS - 2 SP - 613 EP - 623 PB - Springer CY - Berlin AN - OPUS4-25829 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Dietrich, Paul A1 - Unger, Wolfgang T1 - Surface Characterization of Biomaterials T2 - Plenary Meeting ISO TC 201 CY - Naha, Japan DA - 2013-11-07 PY - 2013 AN - OPUS4-29867 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Dietrich, Paul A1 - Holzweber, Markus A1 - Nietzold, Carolin A1 - Panne, Ulrich A1 - Ivanov-Pankov, S. A1 - Weigel, W. A1 - Unger, Wolfgang T1 - XPS studies of epoxy surfaces used for carbohydrate reference surfaces and arrays T2 - Potsdam Days on Bioanalysis 2013 CY - Potsdam-Golm, Germany DA - 2013-11-07 PY - 2013 AN - OPUS4-29875 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Dietrich, Paul A1 - Unger, Wolfgang T1 - The "Area of View" Project: XPS, SIMS and AES T2 - Plenary Meeting ISO TC 201 CY - Naha, Japan DA - 2013-11-07 PY - 2013 AN - OPUS4-29866 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Dietrich, Paul A1 - Nietzold, Carolin A1 - Ivanov-Pankov, S. A1 - Blanchard, V. A1 - Kamalakumar, A. A1 - Holzweber, Markus A1 - Weigel, W. A1 - Panne, Ulrich A1 - Unger, Wolfgang T1 - Development of biosensor standard surfaces with carbohydrate probes T2 - 15th European Conference on Applications of Surface and Interface Analysis 2013 - ECASIA 13 CY - Cagliari, Italy DA - 2013-10-13 PY - 2013 AN - OPUS4-30111 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Dietrich, Paul A1 - Unger, Wolfgang T1 - Oberflächenanalytische Verfahren ur Charakterisierung von Microarrays T2 - Workshop "Qualität und Reproduzierbarkeit von Microarrays CY - Berlin, Germany DA - 2013-06-13 PY - 2013 AN - OPUS4-28797 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Nietzold, Carolin A1 - Dietrich, Paul A1 - Lippitz, Andreas A1 - Panne, Ulrich A1 - Unger, Wolfgang T1 - Cyclodextrin – ferrocene host – guest complexes on silicon oxide surfaces N2 - Research on carbohydrate based interactions with proteins, nucleic acids or antibodies has gained increased interest in the last years especially in clinical diagnosis or drug development. The efficiency of diagnostic interfaces depends upon the number of probe molecules, e.g. carbohydrates. The control of surface parameters as density and distribution of immobilized carbohydrates is essential for a reliable interaction with protein analytes. A controlled production of biomolecular interfaces can be reached by a stepwise quality control during buildup of these biointerfaces. Here, ß-amino-cyclodextrin molecules were attached to amine-reactive silicon oxide surfaces via click chemistry to construct a model biosensor surface. The amount of surface bound carbohydrates was determined indirectly after chemical derivatization with 4-(trifluoromethyl)-benzylamine (TFMBA). Moreover, these surfaces were used to form host-guest complexes of ferrocene (guest) and β-cyclodextrin (host) moieties to mimic the target binding (sensing) of the model biosensor. Surface chemical analysis of all steps during biosensor construction was performed using X-ray photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine structure spectroscopy (NEXAFS). Our approach widens the possibilities to generate switchable surfaces based on ß-Cyclodextrin surfaces for biosensor applications. KW - ß-amino-cyclodextrin KW - Ferrocene KW - Guest complexe KW - XPS KW - NEXAFS PY - 2016 U6 - https://doi.org/10.1002/sia.5958 SN - 0142-2421 SN - 1096-9918 VL - 48 IS - 7 SP - 606 EP - 610 PB - Wiley AN - OPUS4-36856 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Dietrich, Paul A1 - Nietzold, Carolin A1 - Weise, Matthias A1 - Unger, Wolfgang A1 - Alnabulsi, Saad A1 - Moulder, John T1 - XPS depth profiling of an ultrathin bioorganic film with an argon gas cluster ion beam N2 - The growing interest in artificial bioorganic Interfaces as a platform for applications in emerging Areas as personalized medicine, clinical diagnostics, biosensing, biofilms, prevention of biofouling, and other fields of bioengineering is the origin of a need for in Detail multitechnique characterizations of such layers and interfaces. The in-depth analysis of biointerfaces is of special interest as the properties of functional bioorganic coatings can be dramatically affected by in-depth variations of composition. In worst cases, the functionality of a device produced using such coatings can be substantially reduced or even fully lost. KW - XPS KW - Ar gas cluster gun KW - Depth profiling KW - Bioorganic film PY - 2016 UR - http://scitation.aip.org/content/avs/journal/bip/11/2/10.1116/1.4948341 U6 - https://doi.org/10.1116/1.4948341 SN - 1934-8630 VL - 11 IS - 2 SP - 029603-1 EP - 029603-5 PB - American Vacuum Society CY - New York AN - OPUS4-36218 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Lange, Nele A1 - Dietrich, Paul M. A1 - Lippitz, Andreas A1 - Kulak, N. A1 - Unger, Wolfgang T1 - New azidation methods for the functionalization of silicon nitride and application in copper-catalyzed azide-alkyne cycloaddition (CuAAC) N2 - In this study, a new direct functionalization method of silicon nitride (Si3N4) using azidation and click chemistry is presented. First, amino groups (NHx) were created on a Si3N4 substrate by fluoride etching. These NHx-terminated Si3N4 surfaces were analyzed by chemical derivatization X-ray photoelectron spectroscopy (CD-XPS) with 4-trifluoromethylbenzaldehyde (TFBA) and a derivatization yield of 20% was concluded. In the second step freshly prepared NHx surfaces were transformed into azides which were used immediately in a click reaction with halogenated alkynes. The presented combination of amination, azidation and click reaction is a promising alternative for common silane-based Si3N4 functionalization methods. T2 - 16th European Conference on Applications of Surface and Interface Analysis CY - Granada, Spain DA - 28.09.2015 KW - XPS KW - Azidation KW - Click chemistry KW - Silicon nitride KW - Chemical derivatization PY - 2016 UR - http://onlinelibrary.wiley.com/doi/10.1002/sia.5950/full U6 - https://doi.org/10.1002/sia.5950 VL - 48 SP - 621 EP - 625 PB - John Wiley & Sons, Ltd AN - OPUS4-36841 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Dietrich, Paul A1 - Hennig, Andreas A1 - Holzweber, Markus A1 - Thiele, T. A1 - Borcherding, H. A1 - Lippitz, Andreas A1 - Schedler, U. A1 - Resch-Genger, Ute A1 - Unger, Wolfgang T1 - Surface analytical study of poly(acrylic acid)-grafted microparticles (beads): characterization, chemical derivatization, and quantification of surface carboxyl groups N2 - We report a surface analytical study of poly(methyl methacrylate) (PMMA) microparticles (beads) with a grafted shell of poly(acrylic acid) (PAA) with thicknesses up to 4 nm using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), time-of-flight secondary ion mass spectrometry (ToF-SIMS), and near-edge X-ray adsorption fine structure (NEXAFS) spectroscopy. These polymer microparticles were analyzed before and after reaction of the surface carboxyl (CO2H) groups with 2,2,2-trifluoroethylamine (TFEA) to gain a better understanding of methods with use of covalently bound probe molecules for surface group analysis. The results obtained with chemical derivatization XPS using TFEA are discussed in terms of surface quantification of reactive CO2H groups on these PAA-coated microparticles. A labeling yield of about 50% was found for TFEA-derivatized particles with amounts of surface-grafted CO2H groups of 99 µmol/g or more, which is consistent with predicted reaction yields for homogeneously dispersed PAA hydrogels. KW - Polymer microparticles KW - Poly(acrylic acid)-grafted microparticles KW - Beads KW - XPS KW - SEM KW - NEXAFS KW - Surface analysis KW - Fluorine labeling PY - 2014 U6 - https://doi.org/10.1021/jp505519g SN - 1932-7447 SN - 1089-5639 VL - 118 IS - 35 SP - 20393 EP - 20404 PB - Soc. CY - Washington, DC AN - OPUS4-31326 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Mozetic, M. A1 - Ostrikov, K. A1 - Ruzic, D.N. A1 - Curreli, D. A1 - Cvelbar, U. A1 - Vesel, A. A1 - Primc, G. A1 - Leisch, M. A1 - Jousten, K. A1 - Malyshev, O.B. A1 - Hendricks, J.H. A1 - Kövér, L. A1 - Tagliaferro, A. A1 - Conde, O. A1 - Silvestre, A.J. A1 - Giapintzakis, J. A1 - Buljan, M. A1 - Radic, N. A1 - Drazic, G. A1 - Bernstorff, S. A1 - Biedermann, H. A1 - Kylián, O. A1 - Hanus, J. A1 - Milosevic, S. A1 - Galtayries, A. A1 - Dietrich, Paul A1 - Unger, Wolfgang A1 - Lehocky, M. A1 - Sedlarik, V. A1 - Stana-Kleinschek, K. A1 - Drmota-Petric, A. A1 - Pireaux, J.J. A1 - Rogers, J.W. A1 - Anderle, M. T1 - Recent advances in vacuum sciences and applications N2 - Recent advances in vacuum sciences and applications are reviewed. Novel optical interferometer cavity devices enable pressure measurements with ppm accuracy. The innovative dynamic vacuum standard allows for pressure measurements with temporal resolution of 2 ms. Vacuum issues in the construction of huge ultra-high vacuum devices worldwide are reviewed. Recent advances in surface science and thin films include new phenomena observed in electron transport near solid surfaces as well as novel results on the properties of carbon nanomaterials. Precise techniques for surface and thin-film characterization have been applied in the conservation technology of cultural heritage objects and recent advances in the characterization of biointerfaces are presented. The combination of various vacuum and atmospheric-pressure techniques enables an insight into the complex phenomena of protein and other biomolecule conformations on solid surfaces. Studying these phenomena at solid–liquid interfaces is regarded as the main issue in the development of alternative techniques for drug delivery, tissue engineering and thus the development of innovative techniques for curing cancer and cardiovascular diseases. A review on recent advances in plasma medicine is presented as well as novel hypotheses on cell apoptosis upon treatment with gaseous plasma. Finally, recent advances in plasma nanoscience are illustrated with several examples and a roadmap for future activities is presented. KW - Vacuum KW - Surface KW - Plasma KW - Interface KW - Nanoscience PY - 2014 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-304884 SN - 0022-3727 SN - 1361-6463 VL - 47 IS - 15 SP - 153001-1 EP - 153001-23 PB - IOP Publ. CY - Bristol AN - OPUS4-30488 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Heinrich, Thomas A1 - Traulsen, Christoph Hans-Henning A1 - Darlatt, Erik A1 - Richter, S. A1 - Poppenberg, J. A1 - Traulsen, N.L. A1 - Linder, I. A1 - Lippitz, Andreas A1 - Dietrich, Paul A1 - Dib, B. A1 - Unger, Wolfgang A1 - Schalley, C.A. T1 - The versatility of 'Click' reactions at surfaces: Molecular recognition at interfaces N2 - In order to investigate molecular recognition on surfaces, an azide-functionalized monolayer was deposited on gold. The monolayer was characterized by X-ray photoelectron spectroscopy (XPS) and angle-resolved near-edge X-ray absorption fine structure (NEXAFS) experiments and the decomposition of the azide upon irradiation with X-ray beams was investigated. Subsequently, various alkyne-functionalized host and guest molecules were attached to the azide by 1,3-dipolar cycloaddition. These modified surfaces and their host–guest chemistry were analysed by XPS and angle-resolved NEXAFS. The reversibility of guest binding was shown for one example as a proof of principle. KW - 'Click' reaction KW - Azide-terminated surfaces KW - SAMs KW - Host guest molecules KW - Molecular recognition at interfaces PY - 2014 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-306463 SN - 2046-2069 VL - 4 IS - 34 SP - 17694 EP - 17702 PB - RSC Publishing CY - London AN - OPUS4-30646 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Nietzold, Carolin A1 - Dietrich, Paul A1 - Ivanov-Pankov, S. A1 - Lippitz, Andreas A1 - Gross, Thomas A1 - Weigel, W. A1 - Unger, Wolfgang T1 - Functional group quantification on epoxy surfaces by chemical derivatization (CD)-XPS N2 - In this study, epoxy-terminated silicon oxide surfaces were chemically derivatized with trifluoroacetic anhydride (TFAA) and 4-(trifluoromethyl)-benzylamine (TFMBA) and analyzed by X-ray photoelectron spectroscopy, near-edge X-ray absorption fine structure spectroscopy and water contact angle measurements. TFAA was used for quantitative derivatization to determine the amount of reactive epoxy groups on these surfaces. Furthermore, epoxy-terminated surfaces were derivatized with TFMBA (a model compound for biomolecules with an amino linker) yielding secondary amines because of formation of covalent C–N bonds between TFMBA and the epoxy films. Fluorine being part of TFAA and TFMBA composition was used to follow the progress of the chemical derivatization reaction. Both derivatization agents – TFAA and TFMBA – gave comparable reaction yields of ~60% on epoxy silicon surfaces, whereas on epoxy glass slides, the derivatization yields were considerably lower (30–40%).The protocol for attachment of TFMBA (model compound) on epoxy-modified surfaces was adapted to (bio)molecules with an amino linker, e.g. carbohydrates to prepare carbohydrate-functionalized biointerfaces. KW - Biomolecular interfaces KW - Epoxy-functionalized surfaces KW - CD-XPS KW - Functional group quantification KW - Contact angle measurements PY - 2014 U6 - https://doi.org/10.1002/sia.5433 SN - 0142-2421 SN - 1096-9918 VL - 46 IS - 10-11 SP - 668 EP - 672 PB - Wiley CY - Chichester AN - OPUS4-31605 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Dietrich, Paul A1 - Graf, Nora A1 - Gross, Thomas A1 - Lippitz, Andreas A1 - Krakert, S. A1 - Schüpach, B. A1 - Terfort, A. A1 - Unger, Wolfgang T1 - Different Omega-aminothiols and self-assembled monolayers thereof on gold T2 - 13th European Conference on Applications of Surface and Interface Analysis, ECASIA 09 CY - Antalya, Turkey DA - 2009-10-18 PY - 2009 AN - OPUS4-19815 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - RPRT A1 - Dietrich, Paul A1 - Graf, Nora A1 - Gross, Thomas A1 - Lippitz, Andreas A1 - Schüpbach, B. A1 - Terfort, A. A1 - Unger, Wolfgang T1 - Characterization of self-assembled monolayers of terphenylthiols with amine head groups KW - Terphenylthiolate SAMs KW - Gold KW - Microarray KW - NEXAFS PY - 2008 SP - 195 EP - 197 AN - OPUS4-22909 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Dietrich, Paul A1 - Horlacher, T. A1 - Gross, Thomas A1 - Wirth, Thomas A1 - Castelli, R. A1 - Shard, A.G. A1 - Alexander, M. A1 - Seeberger, P. H. A1 - Unger, Wolfgang T1 - Improved quality of microarray platforms by using combined surface analytical tools (XPS, NEXAFS, ToF-SIMS, Water Contact Angle Goniometry) T2 - 13th European Conference on Applications of Surface and Interface Analysis ECASIA 09 CY - Antalya, Turkey DA - 2009-10-18 PY - 2009 AN - OPUS4-19944 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Dietrich, Paul A1 - Gross, Thomas A1 - Graf, Nora A1 - Wirth, Thomas A1 - Unger, Wolfgang A1 - Horlacher, T. A1 - Castelli, R. A1 - Seeberger, P. H. T1 - Surface chemical imaging (ToF-SIMS and XPS) of carbohydrate microarray prototypes T2 - SIMS XVII, 17th International Conference on Secondary Ion Mass Spectrometry CY - Toronto, Canada DA - 2009-09-14 PY - 2009 AN - OPUS4-19930 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Dietrich, Paul A1 - Graf, N. A1 - Gross, Thomas A1 - Lippitz, Andreas A1 - Krakert, S. A1 - Schüpbach, B. A1 - Terfort, A. A1 - Unger, Wolfgang T1 - Different w-aminothiols and self-assembled monolayers thereof on gold T2 - First Joint Ber II and Bessy II Users Meeting, WISTA Adlershof CY - Berlin, Germany DA - 2009-11-12 PY - 2009 AN - OPUS4-20417 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Dietrich, Paul A1 - Gross, Thomas A1 - Graf, N. A1 - Wirth, Thomas A1 - Unger, Wolfgang A1 - Horlacher, T. A1 - Castelli, R. A1 - Seeberger, P. H. T1 - Surface chemical imaging (ToF - SIMS and XPS) of carbohydrate microarray prototypes T2 - ECASIA'09 - 13th European Conference on Applications of Surface and Interface Analysis CY - Antalya, Turkey DA - 2009-10-18 PY - 2009 AN - OPUS4-20418 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Dietrich, Paul A1 - Graf, Nora A1 - Gross, Thomas A1 - Lippitz, Andreas A1 - Krakert, S. A1 - Schüpbach, B. A1 - Terfort, A. A1 - Unger, Wolfgang T1 - Amine species on self-assembled monolayers of omega-aminothiolates on gold as identified by XPS and NEXAFS spectroscopy N2 - Functionalised surfaces are of interest in many fields, e.g. in biomedicine, materials science and molecular electronics. In this study a series of self-assembled aliphatic and aromatic monolayers on gold substrates with terminal amino groups was investigated. Four different thiol molecules were used: aliphatic 11-aminoundecane-1-thiol (AUDT), aromatic 4-aminobenzenethiol (ABT) and aromatic ω-amino thiols with an alkyl spacer as 4-aminophenylbutane-1-thiol (APBT) and 3-(4''-amino-1,1':4',1''-terphenyl-4-yl)propane-1-thiol (ATPT). Evaluation of N 1s XPS data revealed that on the aromatic self-assembled monolayers (SAMs) amino groups exist preferentially as primary amines, whereas on the aliphatic SAM protonated and/or hydrogen-bonded amines are the major species. This result is crosschecked by N K edge near edge X-ray absorption fine structure (NEXAFS) spectroscopy and can be rationalised by the different basicity of aliphatic and aromatic amines. KW - Self-assembled monolayer KW - Amines KW - XPS KW - NEXAFS KW - Surface analysis PY - 2010 U6 - https://doi.org/10.1002/sia.3224 SN - 0142-2421 SN - 1096-9918 VL - 42 SP - 1184 EP - 1187 PB - Wiley CY - Chichester AN - OPUS4-21498 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Dietrich, Paul A1 - Horlacher, T. A1 - Gross, Thomas A1 - Wirth, Thomas A1 - Castelli, R. A1 - Shard, A.G. A1 - Alexander, M. A1 - Seeberger, P.H. A1 - Unger, Wolfgang T1 - Surface analytical characterization of carbohydrate microarrays N2 - Microarrays are a versatile platform for diagnostics and high-throughput analysis. Carbohydrate microarrays are valuable tools to investigate interactions with other molecules since many glycans are involved in fundamental biological processes. A combined X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS) surface analysis was used to investigate the basic steps in the production of carbohydrate microarrays. The preparation included coupling of a thiol-terminated mannoside to maleimide-functionalized glass surfaces derived from γ-aminopropyl silane (GAPS) slides. XPS results clearly demonstrate successful chemical modification in each fabrication step, and ToF-SIMS imaging revealed immobilized carbohydrates in the spotted regions of the final microarray. KW - Carbohydrates KW - Microarrays KW - XPS KW - ToF-SIMS KW - Nona-mannoside KW - Maleimide surfaces KW - Surface analysis PY - 2010 U6 - https://doi.org/10.1002/sia.3255 SN - 0142-2421 SN - 1096-9918 VL - 42 SP - 1188 EP - 1192 PB - Wiley CY - Chichester AN - OPUS4-21500 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Dietrich, Paul A1 - Unger, Wolfgang T1 - Entwicklung einer normativen analytischen Infrastruktur für die Qualitätssicherung von Mikroarrays T2 - 3. Berlin-Brandenburger Technologieforum In Vitro-Diagnostik und Bioanalytik CY - Potsdam, Germany DA - 2011-06-09 PY - 2011 AN - OPUS4-23965 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Dietrich, Paul A1 - Horlacher, T. A1 - Girard-Lauriault, Pierre-Luc A1 - Gross, Thomas A1 - Lippitz, Andreas A1 - Castelli, R. A1 - Min, Hyegeun A1 - Seeberger, P.H. A1 - Unger, Wolfgang T1 - Carbohydrate-functionalized surfaces: Analysis by an multi-method approach T2 - 5th Glycan Forum CY - Berlin, Germany DA - 2011-03-10 PY - 2011 AN - OPUS4-23344 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Dietrich, Paul A1 - Horlacher, T. A1 - Gross, Thomas A1 - Castelli, R. A1 - Rurack, Knut A1 - Seeberger, P. H. A1 - Unger, Wolfgang T1 - Optimization of carbohydrate microarray performances T2 - Bunsentagung 2010 "Interfacial Systems Chemistry: Out of the Vacuumm, Through the Liquid, Into the Cell" CY - Bielefeld, Germany DA - 2010-05-13 PY - 2010 AN - OPUS4-21366 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Unger, Wolfgang A1 - Swaraj, S. A1 - Dietrich, Paul M. T1 - X-ray spectromicroscopy of nanoparticulate iron oxide phases N2 - Soft x-ray spectromicroscopy techniques have seen great amount of development in the recent years, and with the development of new diffraction limited synchrotron source, many new nanoscale and mesoscale characterization opportunities of applied materials are foreseen. In this perspective, the authors present some examples that illustrate the capabilities of spectromicroscopy techniques, namely, 2D and 3D spatially resolved chemical quantification, surface and bulk sensitive measurements, and polarization dependent measurements as applied to iron oxide nanoparticulate materials of biological, geological, and other origins. KW - X-ray spectromicroscopy KW - STXM KW - Iron oxide PY - 2016 U6 - https://doi.org/10.1116/1.4966654 SN - 1934-8630 SN - 1559-4106 VL - 11 IS - 4 SP - 04B402-1 EP - 04B402-6 PB - AVS: Science & Technology of Materials, Interfaces, and Processing AN - OPUS4-38274 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Belsey, N. A. A1 - Cant, D. J. H. A1 - Minelli, C. A1 - Araujo, J. R. A1 - Bock, B. A1 - Brüner, P. A1 - Castner, D. G. A1 - Ceccone, G. A1 - Counsell, J. D. P. A1 - Dietrich, Paul M. A1 - Engelhardt, M. H. A1 - Fearn, S. A1 - Galhardo, C. E. A1 - Kalbe, H. A1 - Kim, J. W. A1 - Lartundo-Rojas, L. A1 - Luftman, H. S. A1 - Nunney, T. S. A1 - Pseiner, J. A1 - Smith, E. F. A1 - Spampinato, V. A1 - Sturm, J. M. A1 - Thomas, A. G. A1 - Treacy, J. P. W. A1 - Veith, L. A1 - Wagstaffe, M. A1 - Wang, H. A1 - Wang, M. A1 - Wang, Y.-C. A1 - Werner, W. A1 - Yang, L. A1 - Shard, A. G. T1 - Versailles Project on Advanced Materials and Standards Interlaboratory Study on Measuring the Thickness and Chemistry of Nanoparticle Coatings Using XPS and LEIS N2 - We report the results of a Versailles Project on Advanced Materials and Standards (VAMAS) interlaboratory study on the measurement of the shell thickness and chemistry of nanoparticle coatings. Peptide-coated gold particles were supplied to laboratories in two forms: a colloidal suspension in pure water and particles dried onto a silicon wafer. Participants prepared and analyzed these samples using either X-ray photoelectron spectroscopy (XPS) or low energy ion scattering (LEIS). Careful data analysis revealed some significant sources of discrepancy, particularly for XPS. Degradation during transportation, storage, or sample preparation resulted in a variability in thickness of 53%. The calculation method chosen by XPS participants contributed a variability of 67%. However, variability of 12% was achieved for the samples deposited using a single method and by choosing photoelectron peaks that were not adversely affected by instrumental transmission effects. The study identified a need for more consistency in instrumental transmission functions and relative sensitivity factors since this contributed a variability of 33%. The results from the LEIS participants were more consistent, with variability of less than 10% in thickness, and this is mostly due to a common method of data analysis. The calculation was performed using a model developed for uniform, flat films, and some participants employed a correction factor to account for the sample geometry, which appears warranted based upon a simulation of LEIS data from one of the participants and comparison to the XPS results. KW - VAMAS KW - Interlaboratory Study KW - Nanoparticle coating KW - XPS KW - LEIS KW - shell thicknss and chemistry PY - 2016 UR - http://pubs.acs.org/doi/pdf/10.1021/acs.jpcc.6b06713 U6 - https://doi.org/10.1021/acs.jpcc.6b06713 IS - 120 SP - 24070 EP - 24079 PB - ACS Publications AN - OPUS4-38428 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -