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Gas sensitive ZnO structures with reduced humidity-interference
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SYSNO ASEP 0509556 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Gas sensitive ZnO structures with reduced humidity-interference Author(s) Vallejos, S. (ES)
Gràcia, I. (ES)
Pizúrová, Naděžda (UFM-A) RID, ORCID
Figueras, E. (ES)
Čechal, J. (CZ)
Hubálek, J. (CZ)
Cané, C. (ES)Number of authors 7 Article number 127054 Source Title Sensors and Actuators B - Chemical. - : Elsevier - ISSN 0925-4005
Roč. 301, DEC (2019)Number of pages 9 s. Language eng - English Country CH - Switzerland Keywords Gas sensor ; Humidity ; Nanostructures ; Zinc oxide Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) R&D Projects EF16_013/0001823 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support UFM-A - RVO:68081723 UT WOS 000489529300042 EID SCOPUS 85072074152 DOI https://doi.org/10.1016/j.snb.2019.127054 Annotation The Authors Gas microsensors based on zinc oxide structures with rod- and needle-like morphology, both integrated via a non-catalyzed vapor-solid mechanism enabled using aerosol-assisted chemical vapor deposition, are developed. Analyses of the films via SEM, TEM, XPS, and water contact angle indicate a higher concentration of oxygen vacancies, higher aspect ratio and higher roughness factor for the needles than for the rods. Gas sensing tests towards hydrogen and carbon monoxide demonstrate reduced humidity-interference, and higher responses to the analytes for the needle-based systems compared to the rods. These results are attributed to the morphology of the sensitive materials, which not only affects the surface-area-to-volume-ratio of the films but also their surface chemistry. These findings indicate that a thorough optimization of morphology, structure and surface properties of gas sensitive metal oxides could allow for more reliable sensor operation in humid conditions. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2020 Electronic address https://doi.org/10.1016/j.snb.2019.127054
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