溶胶-凝胶法制备掺杂稀土元素二氧化钛及其气敏性能  

Synthesis of TiO_2 Powder Doped with Rare Earth Elements by Sol–Gel Method and Its Gas Sensing Properties

作　　者：宋金玲[1,2] 周长才[3] 牟连维 郭冠铭[1] 蔡颖[1,2] 张胤[1,2] 

机构地区：[1]内蒙古科技大学稀土学院,内蒙古包头014010 [2]内蒙古科技大学,内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室,省部共建国家重点实验室培养基地,内蒙古包头014010 [3]内蒙古中煤蒙大新能源化工基地开发有限公司,内蒙古鄂尔多斯017307

出　　处：《过程工程学报》2013年第1期170-174,共5页The Chinese Journal of Process Engineering

基　　金：内蒙古科技大学创新基金资助项目(编号:81111508;81111509)

摘　　要：采用溶胶凝胶法制备了TiO2粉末和掺杂不同稀土离子的TiO2粉末,并通过XRD对制备的样品结构进行了表征,结果表明,制备的TiO2粉末为锐钛矿结构;稀土离子的掺杂抑制了TiO2晶粒生长.其次通过气敏测试仪测试所制备的样品对甲醛、甲苯和丙酮的气敏性,结果表明,掺杂铈的TiO2(TiO2:Ce)对3种气体均具有较高的灵敏性和选择性,可能是由于Ce的掺杂增强了TiO2表面对氧的吸附能力所致.通过TEM分析TiO2:Ce粉末的形貌为粒径约5～12nm的颗粒.TiO2 and TiO2 powders doped with different rare earth ions were prepared by sol-gel method, and their structures characterized by XRD. The results indicate that the prepared TiO2 powder has anatase structure, and rare earth ion doping can restrain the growth of TiO2 crystals. Moreover, its gas sensing properties towards formaldehyde, toluene and acetone gases were measured by a gas sensing instrument. The results show that the TiO2 doped with Ce （TiO2：Ce） exhibits better sensitivity and selectivity towards those gases, which may be attributed to the enhanced capability of adsorbed oxygen on the surface of Ce-doped TiO2. TEM analysis shows that the morphology of TiO2：Ce powder is particles with the diameters of5M2 nm.

关 键 词：溶胶凝胶法 TIO2 TIO2 CE XRD 气敏性能 

分 类 号：TB383[一般工业技术—材料科学与工程]