WO3/CuWO4 nanocomposite thin films for humidity resilient acetone gas sensing

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23520%2F25%3A43976717" target="_blank" >RIV/49777513:23520/25:43976717 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1016/j.apsadv.2025.100894" target="_blank" >https://doi.org/10.1016/j.apsadv.2025.100894</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.apsadv.2025.100894" target="_blank" >10.1016/j.apsadv.2025.100894</a>

Result language
angličtina
Original language name
WO3/CuWO4 nanocomposite thin films for humidity resilient acetone gas sensing
Original language description
We demonstrate a high-performing and selective acetone gas sensor based on WO3/CuWO4 nanocomposites produced by sequentially sputter-deposited WO3 thin films and CuO nanoparticles, engineered to reduce the humidity interference. By optimizing deposition order and layer thicknesses, we harnessed synergistic p-n/n-n heterojunctions and the formation of a catalytic CuWO4 ternary phase. The best performing configuration (20 nm of tungsten oxide film on top of nanoparticles) exhibits a high response (S = 23) to 10 ppm acetone at 300 °C, fast response in dry/humid conditions (38 s/58 s), and low detection limit (0.6 ppm). More importantly, the sensor exhibited > 95 % retention of its response in 90 % relative humidity compared to a loss of >50 % for pristine WO3. The reduced humidity interference is assigned to heterojunction formation at the WO3/CuWO4 interface, Lewis acid sites that allow for acetone selective adsorption, and bulk-dominated conduction. This noble-metal-free acetone sensor overcomes a known shortcoming of metal oxide-based sensors, enabling accurate acetone detection in humid environments for breath-based disease diagnosis (e.g., diabetes) and industrial safety monitoring.
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/EH22_008%2F0004572" target="_blank" >EH22_008/0004572: Quantum materials for applications in sustainable technologies</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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