纳米NdFeO_3和GdFeO_3的制备及其气敏性能  

Preparation and gas-sensing property of nano-NdFeO_3 and GdFeO_3

作　　者：蒋东丽[1] 白先群[1] 刘汉甫[1] 

机构地区：[1]桂林医学院药学院,桂林541004

出　　处：《化工新型材料》2014年第1期71-72,76,共3页New Chemical Materials

基　　金：广西青年科学基金资助项目(桂科青0991086)

摘　　要：以Nd2O3或Gd2O3和FeCl3·6H2O为主要原料,以NaCl为助熔剂,利用固相反应法制备了NdFeO3和GdFeO3纳米晶。用XRD、TEM分别对产品进行了物相和形貌表征,将获得的纯相样品制成烧结型气敏元件,研究了其对丙酮、甲醛、乙醛、乙醇和乙酸的敏感性能。结果表明:纯相纳米NdFeO3和GdFeO3的制备条件分别为900℃煅烧2h与1000℃煅烧4h;其气敏性能测试结果显示,基于NdFeO3材料的元件对被试气体在310℃时均有较强的响应,其中对1000ppm(10-6)酒精灵敏度高达187,基于GdFeO3材料的元件对1000ppm的丙酮、乙酸和甲醛最佳工作温度为260℃,其中对1000ppm甲醛灵敏度达67.1,且该元件在315℃时对1000ppm酒精和乙醛有较强的响应,其中对酒精的灵敏度达90.8。Nanocrystalline NdFeO3 and GdFeO3 were prepared by a simple molten-salt method with Nd2Oa or Gd2 03, FeCla ~ 6H20 as main raw materials. The samples were characterized by X ray diffraction（XRD） and transmission electron microscopy （TEM）. Their gas-sensing properties to CH3 COCH3, H CHO, CH3 CHO, C2 Hs OH and CH3 COOH were investigated. The results showed that pure NdFeO3 and GdFeO3 nanocrystalline could be obtained after calcined at 900℃ for 2h and at 1000℃ for 4h, respectively. The gas sensor based on the nanocrystalline NdFeOa exhibited responding to all the tested gases, and the maximal sensitivity was 187 to 1000ppm CH3COOH at 310℃. It was found that the optimal operating temperature of the GdFeO3 sensors to 1000ppm CH3 COCH3 ,c H3 COOH and HCHO was 260℃, and the highest response was to 1000ppm HCHO （S= 67. 1） in this case. Meanwhile, the GdFeO3 sensors showed strong responses to 1000ppm C4 Hs OH and CH3 CHO （the sensitivity values being 90.8 and 30. 3, respectively） and good selectivity at 315℃.

关 键 词：NdFeO2 GdFeO3 固相反应法 气敏性能 

分 类 号：TB383.1[一般工业技术—材料科学与工程]