Light-activated resistive ozone sensing at room temperature utilizing nanoporous In2O3 particles: Influence of particle size

被引：35

作者：

Klaus, Dominik ^{[1
]}

Klawinski, Danielle ^{[1
]}

Amrehn, Sabrina ^{[1
]}

Tiemann, Michael ^{[1
]}

Wagner, Thorsten ^{[1
]}

机构：

[1] Univ Paderborn, Fac Sci, Dept Chem, Warburger Str 100, D-33098 Paderborn, Germany

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2015年 / 217卷

关键词：

Ordered mesoporous In2O3; Resistive gas sensing; Light enhanced; Ozone sensing; Room temperature sensing; MESOPOROUS IN2O3;

D O I：

10.1016/j.snb.2014.09.021

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Ordered mesoporous In2O3 particles of variable size synthesized by the nanocasting method are used for preparation of resistive gas-sensing layers. Light activation by a LED (blue light, 460 nm) permits room-temperature ozone sensing. Apart from differences in base-line resistance in sensing layers containing small (diameter approx. 170nm) or large particles (approx. 870 nm), differences in the response amplitude and response time constant are also observed. Signal stabilization is achieved faster for small particles. In addition, sensors show a particle size-dependent reaction threshold for low ozone concentration. Larger particles show negligible response to 50 ppb ozone whereas a significant response is observed for the small-particle sensors. A simple model based on geometrical properties and formation of depletion layers explaining the observed behavior is presented. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：181 / 185

页数：5

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