Enhanced C2H5OH sensing characteristics of nano-porous In2O3 hollow spheres prepared by sucrose-mediated hydrothermal reaction

被引：90

作者：

Kim, Sun-Jung ^{[1
]}

Hwang, In-Sung ^{[1
]}

Choi, Joong-Ki ^{[1
]}

Kang, Yun Chan ^{[2
]}

Lee, Jong-Heun ^{[1
]}

机构：

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

[2] Konkuk Univ, Dept Chem Engn, Seoul 143701, South Korea

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2011年 / 155卷 / 02期

关键词：

Gas sensors; In2O3; Hollow spheres; C2H5OH sensors; GAS SENSORS; GRAIN-SIZE; SOLVOTHERMAL SYNTHESIS; MICROSPHERES; SENSITIVITY; SHELL;

D O I：

10.1016/j.snb.2010.12.055

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

In2O3 hollow spheres with shell thicknesses of similar to 150 nm and similar to 300 nm were prepared by the one-pot synthesis of indium-precursor-coated carbon spheres via hydrothermal reaction and subsequent removal of core carbon by heat treatment. The gas response (R-a/R-g, R-a: resistance in air, R-g: resistance in gas) of the thin hollow spheres to 100 ppm C2H5OH was 137.2 at 400 degrees C, which was 1.86 and 3.84 times higher than that of the thick hollow spheres and of the nanopowders prepared by precipitation, respectively. The gas sensing characteristics are discussed in relation to the shell configuration of the hollow spheres. The enhanced gas response of the hollow spheres was attributed to the effective diffusion of analyte gas toward the entire sensor surface via very thin and nano-porous shells. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：512 / 518

页数：7

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