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论文类型：期刊论文

发表时间：2011-04-01

发表刊物：13th International Meeting on Chemical Sensors (IMCS-13)

收录刊物：CPCI-S、SCIE、EI、Scopus

卷号：9

期号：2

页面范围：665-669

ISSN号：1546-198X

关键字：Gas Sensor; Formaldehyde; In2O3; Microemulsion

摘要：Nanometer-sized indium oxide (In2O3) powders were synthesized by a microemulsion method. By increasing the calcination temperature from 300 degrees C to 700 degrees C, the average crystallite size grew from 7 nm to 25 nm. The material was characterizes by XRD and TEM. When the heating temperature was approximately 170 degrees C, the In2O3 based gas sensor has the highest response to formaldehyde. In comparison to gas sensor prepared by larger crystallite size In2O3, the one prepared by smaller crystallite size In2O3 has a higher response to formaldehyde on the same gas concentration. Mixture of with other metal oxides was also investigated. It will be shown that CdO-In2O3 (molar ratio is 1:1) gas sensor has the highest response to formaldehyde in this report. The lowest formaldehyde concentration which is detected by CdO-In2O3 gas sensor is 0.3 ppm.