Nd_(1-x)Zn_xFeO_3纳米材料的甲烷气体气敏性研究  

The CH_4 gas sensing properties of Nd_(1-x)Zn_xFeO_3 nano-materials

作　　者：黄善兴[1] 秦宏伟[1] 刘杏[1] 张瑞[1] 胡季帆[1] 蒋民华[1] 

机构地区：[1]山东大学物理与微电子学院,山东济南250100

出　　处：《山东大学学报（理学版）》2007年第3期36-39,43,共5页Journal of Shandong University(Natural Science)

摘　　要：采用Sol-gel法制备出Nd1-xZnxFeO3（x=0，0．04，0．08，0．2）粉体．XRD图谱表明Nd1-xZnxFeO3粉体为正交钙钛矿结构，产物为纳米级颗粒（16～17．5nm），平均粒径随x的增大有所减小．用Nd1-xZnxFeO3纳米粉体制成气敏元件，测试了材料对甲烷气体的气敏特性．测试结果表明Zn的适量掺入可提高对甲烷的灵敏度．其中以Nd0.92Zn0.08FeO3对甲烷的灵敏度最大，在最佳工作温度200℃下对4×10^-6mol／L的甲烷气体灵敏度最大值为3．87．对2×10^-5mol／L的甲烷气体中灵敏度最大值为16．Nd0.92Zn0.08FeO3还表现出了极好的响应恢复时间特性，工作温度200oC时对2×10。mol／L的甲烷响应、恢复时间分别为25s和45s．Nd1-xZnxFeO3（x = 0, 0.04, 0.08, 0.2） powders with an orthogonal perovskite structure were prepared using the sol-gel method. The average grain sizes of powders are 16- 17.5 nm. The addition of Zn can decrease the grain size. The CH4 gas-sensing properties of Nd1-xZnxFeO3 nano-powders were studied. Among all the investigated materials, Nd0.92Zn0.08FeO3 show maximum sensitivity to CH4 gas. The sensitivity S of Nd0.92Zn0.08FeO3 at optimal working temperature 200 ℃ is 3.87, and 16 for 4×10^-6 mol/L and 2 ×10^-5 mol/L CH4 respectively. The response and recovering time under 2 ×10^-5 mol/L CH4 for Nd0.92Zn0.08FeO3 at 200 ℃ are 25 s and 45 s respectively.

关 键 词：溶胶凝胶法 钙钛矿结构 纳米材料 气敏特性 

分 类 号：TG146.4[一般工业技术—材料科学与工程]