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On the Role of Oxygen Vacancies in the Determination of the Gas-Sensing Properties of Tin-Oxide Nanowires

Published online by Cambridge University Press:  01 February 2011

Roberto Mosca ,
Mingzheng Zha ,
Davide Calestani ,
Laura Lazzarini ,
Giancarlo Salviati ,
Andrea Zappettini ,
Lucio Zanotti ,
Elisabetta Comini  and
Giorgio Sberveglieri
Roberto Mosca
Affiliation:
[email protected] N/A43100Italy
Mingzheng Zha
Affiliation:
[email protected], CNR-IMEM, Parma, N/A, 43100, Italy
Davide Calestani
Affiliation:
[email protected], CNR-IMEM, Parma, N/A, 43100, Italy
Laura Lazzarini
Affiliation:
[email protected], CNR-IMEM, Parma, N/A, 43100, Italy
Giancarlo Salviati
Affiliation:
[email protected], CNR-IMEM, Parma, N/A, 43100, Italy
Andrea Zappettini
Affiliation:
[email protected], CNR-IMEM, Parma, N/A, 43100, Italy
Lucio Zanotti
Affiliation:
[email protected], CNR-IMEM, Parma, N/A, 43100, Italy
Elisabetta Comini
Affiliation:
[email protected], Sensor Lab., INFM-Università di Brescia, Brescia, N/A, 25133, Italy
Giorgio Sberveglieri
Affiliation:
[email protected], Sensor Lab., INFM-Università di Brescia, Brescia, N/A, 25133, Italy
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Abstract

SnO2 nanowires have been recently employed in the “gas-sensors” field and excellent results of conductometric and optical tests on SnO2 nanowires-based gas sensors have been reported.

However, the mechanism that controls the gas-sensing effect in metal oxides nanowires is not fully understood yet. Here the authors present the first results of an in-depth study about the influence of post growth treatments on the physical and gas sensing properties of SnO2 nanowires.

In particular, SnO2 nanowires grown by a vapour transport technique were annealed in a oxygen-rich atmosphere and then characterized by different techniques to assess the influence of the treatment on the nanowires properties.

The annealing in oxygen atmosphere is shown to strongly affect the PL and CL spectra, the electrical resistivity as well as the gas sensing properties of the nanowires. The obtained results are consistent with a reduction of the oxygen vacancies concentration induced by the O2 treatment and seem to confirm the role of these defects in affecting the gas response of SnO2 nanowires-based sensors.

Keywords

sensornanostructureO
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 915: Symposium R – Nanostructured Materials and Hybrid Composites for Gas Sensors and Biomedical Applications , 2006 , 0915-R04-06
Copyright
Copyright © Materials Research Society 2006

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