Nanostructured CuWO4/WO3-x films prepared by reactive magnetron sputtering for hydrogen sensing

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23520%2F20%3A43959071" target="_blank" >RIV/49777513:23520/20:43959071 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1016/j.ijhydene.2020.04.203" target="_blank" >https://doi.org/10.1016/j.ijhydene.2020.04.203</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.ijhydene.2020.04.203" target="_blank" >10.1016/j.ijhydene.2020.04.203</a>

Result language
angličtina
Original language name
Nanostructured CuWO4/WO3-x films prepared by reactive magnetron sputtering for hydrogen sensing
Original language description
High-purity films consisting of copper tungstate (CuWO4) and sub-stoichiometric tungsten oxide (WO3-x) were prepared by reactive sputter deposition. An original two-step deposition process was applied for their synthesis. First, a tungsten oxide thin film was deposited by dc magnetron sputtering from a W target in an Ar + O2 gas mixture, afterward, rf sputtering of a Cu target in an Ar + O2 gas mixture was employed to form a discontinuous CuWO4 layer at the top. This results in a formation of nanostructured branched islands of the tungstate. Bilayers with various layer thicknesses were investigated for the sensitivity to hydrogen gas as a conductometric sensor. The sensitivity changes remarkably with the thicknesses of individual layers. The maximum sensitivity was observed for the films with a layer thickness ratio of 5 nm/20 nm. The response was enhanced more than eight times compared to a 20 nm-thick tungsten oxide alone film. An explanation based on the formation of nano-sized n-n junctions is provided. In addition, a microscopy study of the bilayer growth is presented in detail.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20506 - Coating and films

Project
<a href="/en/project/GA19-13174S" target="_blank" >GA19-13174S: Advanced hydrogen-gas sensing nanomaterials with a tailored architecture</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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