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The UV Effect on the Chemiresistive Response of ZnO Nanostructures to Isopropanol and Benzene at PPM Concentrations in Mixture with Dry and Wet Air

Solomatin, Maksim A.; Glukhova, Olga E.; Fedorov, Fedor S.; Sommer, Martin 1; Shunaev, Vladislav V.; Varezhnikov, Alexey S.; Nasibulin, Albert G.; Ushakov, Nikolay M.; Sysoev, Victor V.
1 Institut für Mikrostrukturtechnik (IMT), Karlsruher Institut für Technologie (KIT)


Towards the development of low-power miniature gas detectors, there is a high interest in the research of light-activated metal oxide gas sensors capable to operate at room temperature (RT). Herein, we study ZnO nanostructures grown by the electrochemical deposition method over Si/SiO$_{2}$ substrates equipped by multiple Pt electrodes to serve as on-chip gas monitors and thoroughly estimate its chemiresistive performance upon exposing to two model VOCs, isopropanol and benzene, in a wide operating temperature range, from RT to 350 °C, and LED-powered UV illumination, 380 nm wavelength; the dry air and humid-enriched, 50 rel. %, air are employed as a background. We show that the UV activation allows one to get a distinctive chemiresistive signal of the ZnO sensor to isopropanol at RT regardless of the interfering presence of H$_{2}$O vapors. On the contrary, the benzene vapors do not react with UV-illuminated ZnO at RT under dry air while the humidity’s appearance gives an opportunity to detect this gas. Still, both VOCs are well detected by the ZnO sensor under heating at a 200–350 °C range independently on additional UV exciting. We employ quantum chemical calculations to explain the differences between these two VOCs’ interactions with ZnO surface by a remarkable distinction of the binding energies characterizing single molecules, which is −0.44 eV in the case of isopropanol and −3.67 eV in the case of benzene. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000135665
Veröffentlicht am 21.07.2021
DOI: 10.3390/chemosensors9070181
Zitationen: 9
Web of Science
Zitationen: 8
Zitationen: 9
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2227-9040
KITopen-ID: 1000135665
HGF-Programm 43.31.02 (POF IV, LK 01) Devices and Applications
Erschienen in Chemosensors
Verlag MDPI
Band 9
Heft 7
Seiten Art. Nr.: 181
Bemerkung zur Veröffentlichung This article belongs to the Special Issue Recent Advances in Multifunctional Sensing Technology for Gas Analysis
Vorab online veröffentlicht am 14.07.2021
Schlagwörter electrochemical deposition; zinc oxide; chemiresistive effect; gas sensor; DFTB; microarray
Nachgewiesen in Web of Science
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