42951 2017 eng 474002, 1 474002, 9 47 29 article IOP Publishing UK Insitute of Physics 1 -- -- -- Two systems of suspended nanoparticles have been studied with near-ambient pressure x-ray photoelectron spectroscopy: silver nanoparticles in water and strontium fluoride—calcium fluoride core-shell nanoparticles in ethylene glycol. The corresponding dry samples were measured under ultra high vacuum for comparison. The results obtained under near-ambient pressure were overall comparable to those obtained under ultra high vacuum, although measuring silver nanoparticles in water requires a high pass energy and a long acquisition time. A shift towards higher binding energies was found for the silver nanoparticles in aqueous Suspension compared to the corresponding dry sample, which can be assigned to a change of surface potential at the water-nanoparticle interface. The shell-thickness of the core-shell nanoparticles was estimated based on simulated spectra from the National Institute of Standards and Technology database for simulation of electron spectra for surface analysis. With the instrumental set-up presented in this paper, nanoparticle suspensions in a suitable Container can be directly inserted into the analysis chamber and measured without prior sample preparation. Journal of Physics: Condensed Matter 10.1088/1361-648X/aa8b9d 1361-648X 0953-8984 Geburtsname von Müller, Anja: Hermanns, A. - Birth name of Müller, Anja: Hermanns, A. 17.11.2017 Marit Kjaervik Anja Müller P. Dietrich A. Thissen S. Bahr B. Ritter E. Kemnitz Wolfgang Unger eng uncontrolled Nanoparticles eng uncontrolled Suspensions eng uncontrolled Core-shell nanoparticles eng uncontrolled NAP-XPS Analytische Chemie Verlagsliteratur Datei im Netzwerk der BAM verfügbar ("Closed Access")