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    <issue/>
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    <publisherName>Deutsche Physikalische Gesellschaft</publisherName>
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    <title language="eng">Bare and Pd-doped ceria thin films prepared by ALD and EBE for hydrogen detection</title>
    <abstract language="eng">The need to store and use hydrogen safely as part of green economy based on renewable energy evokes a necessity to reliably detect it at ambient conditions. The majority of currently used sensors are working at elevated temperatures (200-500 °C). In this work, we demonstrate that ceria films deposited on a commercial electrode by atomic layer deposition (ALD) and electron beam evaporation (EBE) electrically respond to hydrogen (from 20 to 500 ppm) at much lower temperatures (50-200 °C). The results reveal that &lt;1.5 nm thin Pd adlayer increases the electrical response by several orders of magnitude for both ceria films. The NAP-XPS study under changing oxidative/reductive atmospheres sheds light on the mechanism of Pd-CeOx thermal activation and the role of the deposition technique in the reactivity of the oxide.</abstract>
    <parentTitle language="eng">Verhandlungen der DPG</parentTitle>
    <identifier type="issn">0420-0195</identifier>
    <identifier type="url">https://www.dpg-verhandlungen.de/year/2024/conference/berlin/part/o/session/59/contribution/5</identifier>
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    <enrichment key="Fprofil">1 Energiewende und Dekarbonisierung / Energy Transition and Decarbonisation</enrichment>
    <enrichment key="Fprofil">4 Künstliche Intelligenz und Sensorik / Artificial Intelligence and Sensor Technology</enrichment>
    <author>
      <firstName>Yuliia</firstName>
      <lastName>Kosto</lastName>
    </author>
    <submitter>
      <firstName>Karsten</firstName>
      <lastName>Henkel</lastName>
    </submitter>
    <author>
      <firstName>Paulina</firstName>
      <lastName>Kapuscik</lastName>
    </author>
    <author>
      <firstName>Rudi</firstName>
      <lastName>Tschammer</lastName>
    </author>
    <author>
      <firstName>Dominic</firstName>
      <lastName>Guttmann</lastName>
    </author>
    <author>
      <firstName>Ewa</firstName>
      <lastName>Mankowska</lastName>
    </author>
    <author>
      <firstName>Peter</firstName>
      <lastName>Matvija</lastName>
    </author>
    <author>
      <firstName>Carlos</firstName>
      <lastName>Morales</lastName>
    </author>
    <author>
      <firstName>Michał</firstName>
      <lastName>Mazur</lastName>
    </author>
    <author>
      <firstName>Karsten</firstName>
      <lastName>Henkel</lastName>
    </author>
    <author>
      <firstName>Iva</firstName>
      <lastName>Matolinova</lastName>
    </author>
    <author>
      <firstName>Jarosław</firstName>
      <lastName>Domaradzki</lastName>
    </author>
    <author>
      <firstName>Jan Ingo</firstName>
      <lastName>Flege</lastName>
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    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Hydrogen sensor</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Atomic layer deposition (ALD)</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>ceria</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Near-ambient pressure X-ray photoelectron spectroscopy (NAP-XPS)</value>
    </subject>
    <collection role="institutes" number="1503">FG Angewandte Physik und Halbleiterspektroskopie</collection>
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    <pageNumber>12</pageNumber>
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    <issue/>
    <volume>417</volume>
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    <completedDate>2024-07-03</completedDate>
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    <title language="eng">Low temperature hydrogen sensor with high sensitivity based on CeOx thin film</title>
    <abstract language="eng">In this work, a 500 nm-thick cerium oxide thin film was prepared by electron beam evaporation. It was found that the deposition of 7 nm thick Pd catalyst was required for obtaining a sensor response to hydrogen. The Pd/CeOx sensing structure has a high response of 5000 towards 25 ppm H2 at a working temperature of 200 °C and exhibits a sensor response of 1.3 at temperatures near ambient. Furthermore, the sensing structure exhibited excellent response/recovery kinetics. The results confirm that the CeOx-based materials are a promising material for the fabrication of room-temperature hydrogen sensors.</abstract>
    <parentTitle language="eng">Sensors and Actuators B: Chemical</parentTitle>
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    <author>
      <firstName>Paulina</firstName>
      <lastName>Kapuścik</lastName>
    </author>
    <submitter>
      <firstName>Karsten</firstName>
      <lastName>Henkel</lastName>
    </submitter>
    <author>
      <firstName>Damian</firstName>
      <lastName>Wojcieszak</lastName>
    </author>
    <author>
      <firstName>Patrycja</firstName>
      <lastName>Pokora</lastName>
    </author>
    <author>
      <firstName>Ewa</firstName>
      <lastName>Mańkowska</lastName>
    </author>
    <author>
      <firstName>Jarosław</firstName>
      <lastName>Domaradzki</lastName>
    </author>
    <author>
      <firstName>Michał</firstName>
      <lastName>Mazur</lastName>
    </author>
    <author>
      <firstName>Piotr</firstName>
      <lastName>Mazur</lastName>
    </author>
    <author>
      <firstName>Yuliia</firstName>
      <lastName>Kosto</lastName>
    </author>
    <author>
      <firstName>Carlos</firstName>
      <lastName>Morales</lastName>
    </author>
    <author>
      <firstName>Małgorzata</firstName>
      <lastName>Kot</lastName>
    </author>
    <author>
      <firstName>Jan Ingo</firstName>
      <lastName>Flege</lastName>
    </author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Cerium oxide</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Thin film</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Hydrogen sensing</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Low operating temperature</value>
    </subject>
    <collection role="institutes" number="1503">FG Angewandte Physik und Halbleiterspektroskopie</collection>
  </doc>
  <doc>
    <id>30703</id>
    <completedYear/>
    <publishedYear>2023</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue>8</issue>
    <volume>23</volume>
    <type>articler</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2023-04-12</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Hydrogen Gas Sensing Properties of Mixed Copper–Titanium Oxide Thin Films</title>
    <abstract language="eng">Hydrogen is an efficient source of clean and environmentally friendly energy. However, because it is explosive at concentrations higher than 4%, safety issues are a great concern. As its applications are extended, the need for the production of reliable monitoring systems is urgent. In this work, mixed copper–titanium oxide ((CuTi)Ox) thin films with various copper concentrations (0–100 at.%), deposited by magnetron sputtering and annealed at 473 K, were investigated as a prospective hydrogen gas sensing material. Scanning electron microscopy was applied to determine the morphology of the thin films. Their structure and chemical composition were investigated by X-ray diffraction and X-ray photoelectron spectroscopy, respectively. The prepared films were nanocrystalline mixtures of metallic copper, cuprous oxide, and titanium anatase in the bulk, whereas at the surface only cupric oxide was found. In comparison to the literature, the (CuTi)Ox thin films already showed a sensor response to hydrogen at a relatively low operating temperature of 473 K without using any extra catalyst. The best sensor response and sensitivity to hydrogen gas were found in the mixed copper–titanium oxides containing similar atomic concentrations of both metals, i.e., 41/59 and 56/44 of Cu/Ti. Most probably, this effect is related to their similar morphology and to the simultaneous presence of Cu and Cu2O crystals in these mixed oxide films. In particular, the studies of surface oxidation state revealed that it was the same for all annealed films and consisted only of CuO. However, in view of their crystalline structure, they consisted of Cu and Cu2O nanocrystals in the thin film volume.</abstract>
    <parentTitle language="eng">Sensors</parentTitle>
    <identifier type="issn">1424-8220</identifier>
    <identifier type="doi">10.3390/s23083822</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="Artikelnummer">3822</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="Publikationsweg">Open Access</enrichment>
    <enrichment key="Fprofil">1 Energiewende und Dekarbonisierung / Energy Transition and Decarbonisation</enrichment>
    <enrichment key="Fprofil">4 Künstliche Intelligenz und Sensorik / Artificial Intelligence and Sensor Technology</enrichment>
    <author>
      <firstName>Ewa</firstName>
      <lastName>Mańkowska</lastName>
    </author>
    <submitter>
      <firstName>Karsten</firstName>
      <lastName>Henkel</lastName>
    </submitter>
    <author>
      <firstName>Michał</firstName>
      <lastName>Mazur</lastName>
    </author>
    <author>
      <firstName>Jarosław</firstName>
      <lastName>Domaradzki</lastName>
    </author>
    <author>
      <firstName>Piotr</firstName>
      <lastName>Mazur</lastName>
    </author>
    <author>
      <firstName>Małgorzata</firstName>
      <lastName>Kot</lastName>
    </author>
    <author>
      <firstName>Jan Ingo</firstName>
      <lastName>Flege</lastName>
    </author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>mixed copper–titanium oxides</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Cu2O</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>TiO2</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>(CuTi)Ox</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>hydrogen gas sensing</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>thin films</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>magnetron sputtering</value>
    </subject>
    <collection role="institutes" number="1503">FG Angewandte Physik und Halbleiterspektroskopie</collection>
  </doc>
</export-example>
