Optical sensing of NO2 in tin oxide nanowires at sub-ppm level
Year: 2008
Authors: Setaro A., Bismuto A., Lettieri S., Maddalena P., Comini E., Bianchi S., Baratto C., Sberveglieri G.
Autors Affiliation: Univ Naples Federico 2, CNR, INFM Coherentia, I-80126 Naples, Italy; Univ Naples Federico 2, Dipartimento Sci Fis, I-80126 Naples, Italy; Univ Brescia, CNR, INFM, SENSOR, I-25133 Brescia, Italy.
Abstract: Tin oxide nanostructures are currently considered as promising materials for gas sensing. Some of their physical properties, such as visible light photoluminescence, are still not fully understood and require further investigations. In this work we report on the quenching of tin oxide nanowires photoluminescence induced by nitrogen dioxide adsorption at the ppm and sub-ppm level. The recombination dynamics was investigated by means of time-resolved photoluminescence, finding non-exponential decay profiles. Neither the photoluminescence spectral shape nor the decay rates are found to depend significantly on the nitrogen dioxide concentration, suggesting that the gas-nanostructure interaction resides in a net reduction of the density of states which are responsible for the radiative transitions. (C) 2007 Elsevier B.V All rights reserved.
Journal/Review: SENSORS AND ACTUATORS B-CHEMICAL
Volume: 130 (1) Pages from: 391 to: 395
KeyWords: metal oxide nanostructures; tin dioxide; photoluminescence; gas sensingDOI: 10.1016/j.snb.2007.09.015Citations: 30data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-10-20References taken from IsiWeb of Knowledge: (subscribers only)