Equivalence between thermal and room temperature UV light-modulated responses of gas sensors based on individual SnO2 nanowires

被引：188

作者：

Prades, J. D. ^{[1
]}

Jimenez-Diaz, R. ^{[1
]}

Hernandez-Ramirez, F. ^{[2
]}

Barth, S. ^{[3
]}

Cirera, A. ^{[1
]}

Romano-Rodriguez, A. ^{[1
]}

Mathur, S. ^{[3
,4
]}

Morante, J. R. ^{[1
]}

机构：

[1] Univ Barcelona, Dept Elect, EME XaRMAE IN2UB, Barcelona, Spain

[2] Elect Nanosyst SL, Barcelona, Spain

[3] Leibniz Inst New Mat, Saarbrucken, Germany

[4] Univ Cologne, Dept Inorgan Chem, Cologne, Germany

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2009年 / 140卷 / 02期

关键词：

Monocrystalline; Metal oxide; SnO2; Nanowire; Photoactivation; Gas Sensor; TIN OXIDE; SENSING PROPERTIES; AB-INITIO; ACTIVATION; ADSORPTION; NO2; SURFACE; FILMS;

D O I：

10.1016/j.snb.2009.04.070

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

We demonstrate that illuminating metal oxide gas sensors with ultra-violet light is a viable alternative not only to activate but also to modulate their response towards oxidizing gases. Here, the performance of individual monocrystalline SnO2 nanowires to NO2 at room temperature as function of the flux and the energy of photons is studied. The results reveal that nearly identical responses, similar to thermally activated sensor surfaces, can be achieved by choosing the optimal illumination conditions. On the basis these results, a qualitative model to explain the response of these sensors towards oxidizing gases is proposed. This finding paves the way to the development of conductometric gas sensors operating at room temperature. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：337 / 341

页数：5

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