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Indexed by:期刊论文

Date of Publication:2011-04-01

Journal:13th International Meeting on Chemical Sensors (IMCS-13)

Included Journals:CPCI-S、SCIE、EI、Scopus

Volume:9

Issue:2

Page Number:665-669

ISSN No.:1546-198X

Key Words:Gas Sensor; Formaldehyde; In2O3; Microemulsion

Abstract: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.