Tin Oxide Nanowires Decorated with Ag Nanoparticles for Visible Light-Enhanced Hydrogen Sensing at Room Temperature: Bridging Conductometric Gas Sensing and Plasmon-Driven Catalysis

Anno: 2018

Autori: Cattabiani N., Baratto C., Zappa D., Comini E., Donarelli M., Ferroni M., Ponzoni A., Faglia G.

Affiliazione autori: Univ Brescia, Dept Informat Engn, SENSOR Lab, Via Branze 38, I-25123 Brescia, Italy; CNR INO, SENSOR Lab, Via Branze 45, I-25123 Brescia, Italy.

Abstract: We demonstrate that conductometric gas sensing at room temperature with SnO2 nanowires (NWs) is enhanced by visible and supraband gap UV irradiation when and only when the metal oxide NWs are decorated with Ag nanoparticles (NPs) (diameter < 20 nm); no enhancement is observed for the bare SnO2 case. We combine the spectroscopic techniques with conductometric gas sensing to study the wavelength dependency of the sensors' response, showing a strict correlation between the Ag-loaded SnO2 optical absorption and its gas response as a function of irradiation wavelength. Our results lead to the hypothesis that the enhanced gas response under UV vis light is the effect of plasmonic hot electrons populating the Ag NPs surface. Finally, we discuss the chemiresistive properties of Ag-loaded SnO2 sensor in parallel with the theory of plasmon-driven catalysis, to propose an interpretative framework that is coherent with the established paradigma of these two separated fields of study. Giornale/Rivista: JOURNAL OF PHYSICAL CHEMISTRY C

Volume: 122 (9)      Da Pagina: 5026  A: 5031

Maggiori informazioni: The research leading to these results was funded by the NATO Science for Peace and Security Programme under grant no. 9085043. We also acknowledge Prof. V. Golovanov for the fruitful discussion.
Parole chiavi: Electronic Interaction; Sno2 Nanowires; Sensors; Oxidation; Additives; Nanostructures
DOI: 10.1021/acs.jpcc.7b09807

Citazioni: 27
dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-10-27
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