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Effect of MgO Doping on the Conductance and Gas-sensing Properties of In2 O3
Ge Xiutao*,Ni Shouchun
Author NameAffiliationE-mail
Ge Xiutao* Department of Chemistry, Chuzhou Normal College, Chuzhou 239012 gxt59228@mail.cz.ah163.net 
Ni Shouchun Department ofPhysics, Chuzhou Normal College, Chuzhou 239012  
Abstract:
Micro-powder of In2O3 doped with MgO is prepared by chemical coprecipitation, effects of Mg2+ on the conductance and gas-sensing properties of In2O3 was investigated. The results demonstrated that limite solid solution In2-xMgxO3(0≤x≤0.40) can be formed between MgO and In2O3. Positive protons produced i the ionization process of MgIn×can null the electrons in the conductive gap and this decrease the electrical conductance of the micro-powder significantly. The sensor based on then(Mg2+)∶n(In3+)=1∶2 chemical coprecip tation raw powder sintered at 900℃ for 4 h, to 45μmol/L C2H5OH can be 102.5 at 320~370℃. This is twelve times more than that of same concentration petrol.
Key words:  Mg2+, In2-xMgxO3, Conductance, Ethanol-sensing sensor
FundProject:安徽省教育厅自然科学基金资助项目(2001kj183
镁掺杂对In2O3电导和气敏性能的影响
葛秀涛*,倪受春
摘要:
用共沉淀法制备了Mg2+掺杂的In2O3纳米粉,研究了镁掺杂对In2O3电导和气敏性能的影响.结果表明:MgO和In2O3间可形成有限固溶体In2-xMgxO3(0≤x≤0.40);MgIn×电离的空穴对材料导带电子的湮灭,使掺镁纳米粉的电导变得很小;n(Mg2+):n(In3+)=1:2共沉淀物于900℃下热处理4 h,用所得的纳米粉制作的传感器在320~370℃下,对45μmol/L C2H5OH的灵敏度达102.5,为相同浓度干扰气体Petrol的12倍多.
关键词:  Mg2+  In2-xMgxO3  电导  酒敏传感器
DOI:10.1088/1674-0068/15/2/157-160
分类号: