Enhanced CO sensing characteristics of hierarchical and hollow In2O3 microspheres

被引：131

作者：

Choi, Kwon-Il ^{[1
]}

Kim, Hae-Ryong ^{[1
]}

Lee, Jong-Heun ^{[1
]}

机构：

[1] Korea Univ, Dept Mat Sci & Engn, Seoul 136713, South Korea

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2009年 / 138卷 / 02期

关键词：

In2O3; Hierarchical nanostructures; Hollow spheres; Gas sensing kinetics; SEMICONDUCTOR GAS SENSORS; COBALT OXIDE; THIN-FILM; SURFACE; NO2; NANOSTRUCTURES; SENSITIVITY; MORPHOLOGY; NANOWIRES; MECHANISM;

D O I：

10.1016/j.snb.2009.02.016

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Hierarchical and hollow In2O3 miciospheres were prepared by a solvothemal self-assembly reaction and their CO sensing characteristics were compared to those of an agglomerated counterpart. Upon exposure to 10-50 ppm CO at 400 degrees C, the gas responses (R-a/R-g; R-a: resistance in air, R-g: resistance in gas) of the hierarchical and hollow Structures were 1.6-2.7 times higher than that of the agglomerated sample. In addition, their 90% responses and recovery speeds were 23 times and 7.7 times higher, respectively. Their significantly improved gas responses and sensing/recovery kinetics were concluded to be Mated to the nanoporous and well-aligned nanostructures, which allow effective and rapid gas diffusion toward the sensing surfaces. (C) 2009 Elseviei B.V. All rights reserved.

引用

页码：497 / 503

页数：7

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