Nanostructured materials based on a mixture of CuOx and WOx nanoparticles for hydrogen-gas sensing

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23520%2F22%3A43965841" target="_blank" >RIV/49777513:23520/22:43965841 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Nanostructured materials based on a mixture of CuOx and WOx nanoparticles for hydrogen-gas sensing

Original language description

In this work, we report on the preparation and properties of high-purity hydrogen-gas sensing thin-films materials based on a mixture of CuOx and WOx nanoparticles and with their top surface decorated by PdOx nanoparticles. The films were prepared using the Nanogen-Trio NP source (Mantis Deposition Ltd) equipped with three 1′′ magnetrons mounted on a custom-built deposition chamber. Each magnetron was equipped with a corresponding metallic target (Cu, W, or Pd) and sputtered by a DC power supply (Genesys 750 W, TDK Lambda) in Ar + O2 gas mixture. During the deposition, the operation of individual magnetrons (only one magnetron was operated at a time) was controlled using custom software allowing the preparation of a mixture of nanoparticles of different materials with a defined volumetric ratio of the individual materials. The sensorial response of the prepared films to hydrogen was measured in a small reaction chamber (total volume of 9 cm^3) at a continuous flow of background gas of specific composition (synthetic air + H2 + H2O) using a custom-made four-point probe system. We show that the sensorial response of the mixture of nanoparticles is significantly enhanced as compared to the response of single-phase materials (i.e., made of CuOx or WOx nanoparticles only). We explain this observation based on the formation of nano-sized p-n junctions in between p-type CuOx and n-type WOx nanoparticles. We further search for an optimum ratio of CuOx and WOx nanoparticles to maximize the sensorial response of the film.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

20506 - Coating and films

Project

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Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů