文献类型：期刊文献

英文题名：Sensing characterization of Sn/In/Ti nanocomplex oxides for CO, CH 4 and NO2

作者：Bai, Shouli[1]; Tong, Zhangfa[2]; Li, Dianqing[1]; Huang, Xiaowei[3]; Luo, Ruixian[1]; Chen, Aifan[1]

第一作者：Bai, Shouli

通讯作者：Li, D.

机构：[1] State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China; [2] School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China; [3] College of Biochemical Engineering, Beijing Union University, Beijing 100023, China

第一机构：State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China

通讯机构：[1]State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China

年份：2007

卷号：50

期号：1

起止页码：18-26

外文期刊名：Science in China, Series E: Technological Sciences

收录：EI(收录号：20070910456755);Scopus(收录号：2-s2.0-33847194697)

语种：英文

外文关键词：Carbon monoxide - Chemical sensors - Complexation - Particle size analysis - pH effects - Precipitation (chemical) - X ray diffraction - X ray photoelectron spectroscopy

摘要：The nanocomplex oxides of Sn-In and Sn-In-Ti were prepared by controlled co-precipitation method as sensing materials of semiconductor gas sensors for detection of CO, CH4 and NO2. Through manipulating the Sn/In cation ratio, metal salt total concentration, precipitation pH value and aging time, the nanocrystalline powders were successfully derived with chemical homogeneity and superior thermal stability, compared with the single component oxides. The particle size and morphology, surface area, and thermal and phase stabilities were characterized using TEM, TG-DTA, BET and XRD. The sensing tests showed that the Sn-In composites exhibit high sensitivity and selectivity for CO and NO2. The introduction of TiO2 enhanced CH 4 sensitivity and selectivity, particularly, additives of Pd and Al2O3 as a dopant and surface modification greatly enhanced the sensing properties. The sensitivity depended on the composition of composites, calcination temperature and operating temperature. The optimal values were (25%In2O3-75%SnO2)-20%TiO 2 for temary composite, 600 and 300°C, respectively. Temperature-programmed desorption (TPD) studies were employed to explain the gas adsorption behavior displayed by the surface of nanocomposites and X-ray photoelectron spectroscopic (XPS) analysis was used to confirm the electronic interactions existing between oxide components. The sensing mechanism of the nanocomposites was attributed to chemical and electronic synergistic effects. ? Science in China Press 2007.