In_2O_3基纳米氨敏传感器材料的制备、结构及气敏特性  

Preparation, structure and sensitivity of In_2O_3 based nanomaterials as ammonia sensor

作　　者：郭鹏峰[1] 潘海波[1] 

机构地区：[1]福州大学功能材料研究所,福建福州350002

出　　处：《福州大学学报（自然科学版）》2005年第3期305-308,共4页Journal of Fuzhou University(Natural Science Edition)

基　　金：福建省自然科学基金计划资助项目(项目编号:E0210012)

摘　　要：以InCl3·4H2O为源物质,采用溶胶-凝胶法制备了纳米级的In2O3及其掺杂Ti(Ⅳ)、Cr(Ⅵ)和Mo(Ⅵ)的粉体,并进行了热分析、多晶粉末衍射等表征.作为一种氨敏传感器,离子掺杂明显增强了传感器对另外2种还原性气体H2和CO的选择性.其传感器的敏感机理可能是由于材料对不同气体分子的吸附和活化造成的,掺杂减少了材料表面与H2和CO发生反应的活性位,从而提高了此类材料对氨气的选择性.Nanoscale powders for pure In_2O_3 and In_2O_3 doped with Ti(Ⅳ) , Cr(Ⅵ) and Mo(Ⅵ) were prepared by sol-gel process using InCl_3·4H_2O as a source matter. Characterization of the materials was performed by thermoanalysis, XRD. Using this material as the ammonia sensor, the doped In_2O_3 sensor shows obvious enhancement of selectivity to the other two reducing gases, H_2 and CO. The mechanism of gas-sensing selectivity is proposed on the basis of the different molecule adsorption and activation, along with doping the foreign ions the chemisorption sites decrease for H_2 and CO, so the selectivity for NH_3 is enhanced.

关 键 词：掺杂In2O3 溶胶-凝胶法 氨敏传感器 选择性机理 

分 类 号：TB381[一般工业技术—材料科学与工程]