热分解法制备纳米NdFeO_3气敏材料的研究

Thermal decomposition method to prepare gas sensing material NdFeO_3 compound oxide nanopowder

以分析纯的K3[Fe(CN)6]和NdCl3为原料,利用室温固相反应法制备纳米NdFeO3的前驱体Nd[Fe(CN)6],通过热分解前驱体得到气敏材料NdFeO3.用TG-DSC,XRD,TEM对产物进行了表征,并对其气敏性能进行了初步研究.结果表明:热分解法与溶胶-凝胶法相比可降低复合氧化物的生成温度及煅烧时间,形成的钙钛矿型NdFeO3粉体呈现圆柱状晶形,直径约为30 nm,长度为40 nm^50 nm.用热分解法制得的NdFeO3气敏元件呈现P型半导体特性,对H2S气体具有一定的灵敏度.

Gas sensing material NdFeO3 is prepared with K3 [Fe（CN）6 ] and NdCl3 by the thermal decomposing method to decompose Nd[Fe（CN）6]. Its capacity is studied by TG-DSC, XRD and TEM. The thermal decomposing method could decrease the prepared temperature and calcined time of compound oxide. Compared to solgel method, the powders of NdFeO3 is columned crystalline. The diameter is 30 min, and the length is 40 nm-50 nm. NdFeO3 prepared by thermal decomposing method has the properties of P-type semiconductor, and has good gas sensing properties to H2S gas.