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Proceedings Paper

Tin oxide nanowires decorated with Ag nanoparticles for plasmon-driven chemical sensing at room temperature (Conference Presentation)
Author(s): Camilla Baratto; Nicola Cattabiani; Maurizio Donarelli; Andrea Ponzoni; Dario Zappa; Elisabetta Comini; Guido Faglia; Nicolò Bontempi

Paper Abstract

We demonstrate that conductometric gas sensing at room temperature with SnO2 nanowires is enhanced by visible and supra bandgap UV irradiation when and only when the metal oxide nanowires are decorated with Ag nanoparticles (r < 20 nm); no enhancement is observed for the bare SnO2 case. We combine 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 nanoparticles surface. Finally we discuss the chemoresistive 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 actually separated fields of study.

Paper Details

Date Published: 14 March 2018
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Proc. SPIE 10541, Photonic and Phononic Properties of Engineered Nanostructures VIII, 105411P (14 March 2018); doi: 10.1117/12.2290057
Show Author Affiliations
Camilla Baratto, Istituto Nazionale di Ottica (Italy)
Univ. degli Studi di Brescia (Italy)
Nicola Cattabiani, Istituto Nazionale di Ottica (Italy)
Consiglio Nazionale delle Ricerche (Italy)
Univ. degli Studi di Brescia (Italy)
Maurizio Donarelli, Univ. degli Studi di Brescia (Italy)
Consiglio Nazionale delle Ricerche (Italy)
Istituto Nazionale di Ottica (Italy)
Andrea Ponzoni, Istituto Nazionale di Ottica (Italy)
Dario Zappa, Univ. degli Studi di Brescia (Italy)
Istituto Nazionale di Ottica (Italy)
Elisabetta Comini, Univ. degli Studi di Brescia (Italy)
Istituto Nazionale di Ottica (Italy)
Guido Faglia, Univ. degli Studi di Brescia (Italy)
Istituto Nazionale di Ottica (Italy)
Nicolò Bontempi, Istituto Nazionale di Ottica (Italy)
Univ. degli Studi di Brescia (Italy)


Published in SPIE Proceedings Vol. 10541:
Photonic and Phononic Properties of Engineered Nanostructures VIII
Ali Adibi; Shawn-Yu Lin; Axel Scherer, Editor(s)

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