热氧化法制备α-Fe_2O_3纳米线的气敏特性及其机理  

Gas-sensing and mechanism of α-Fe_2O_3 nanowires synthesized by thermal oxidation

作　　者：钟明龙[1,2] 

机构地区：[1]江西理工大学工程研究院,江西赣州341000 [2]华南理工大学材料科学与工程学院,广州510640

出　　处：《有色金属科学与工程》2014年第4期55-58,共4页Nonferrous Metals Science and Engineering

基　　金：江西省教育厅青年科学基金资助项目(GJJ14442);江西理工大学博士启动基金资助项目(jxxjbs13017)

摘　　要：家用燃气事故、汽车尾气和工业废气等问题日趋严重,传统气敏材料已很难满足对气体监测越来越高的要求,纳米结构α-Fe2O3因其热稳定性好、选择性好,以及无毒、抗腐蚀性强、环境友好、价格低廉等已成为最重要的气敏材料之一.采用简单的热氧化法成功制备了α-Fe2O3纳米线.纳米线平均直径为20～50 nm,长度可达1～5μm;以制备的α-Fe2O3纳米线为探测材料的气敏元件在50×10-6乙醇气氛中的最佳工作温度为383°C,灵敏度可达2.4,响应和恢复时间分别为13 s和6 s.基于α-Fe2O3纳米线制备的气敏元件在乙醇中的气敏机理为表面电阻控制型.The traditional gas-sensitive materials has been difficult to meet the increasing demands in gas monitoring because of the more and more serious problems in domestic gas, vehicle exhaust and industrial emissions. α-Fe2O3 nanostructures become one of the most important gas-sensitive materials due to its good thermal stability, high selectivity, non-toxic, anti-corrosive, environmental friendliness and low price.Herein, single monoclinic crystalline α-Fe2O3 nanowires are synthesized by simple thermal oxidation. α-Fe2O3 nanowires have an average 20 ～50 nm in diameters, and a length up to 1 ～5 μm. The optimum working temperature is about 383 ° C and sensitivity is up to 2.4 in 50 ppm ethanol atmosphere. The corresponding recovery and response time were 13 s and 6 s, respectively. Gas sensing mechanism in ethanol for the sensor based on α-Fe2O3 nanowires are surface resistivity controlled type.

关 键 词：Α-FE2O3 纳米线 气敏特性 乙醇 

分 类 号：TG141[一般工业技术—材料科学与工程] TB383[金属学及工艺—金属材料]