铁酸镧纳米材料的制备表征及气敏性研究  

Preparation and Characterization of LaFeO_3 Nanomaterial and Its Gas Sensitivity

作　　者：付文娟[1] 王丽斐[1] 郑最胜[1] 陆维昌[1] 陈邦林[1] 

机构地区：[1]华东师范大学化学系,上海200062

出　　处：《化学世界》2009年第4期193-196,204,共5页Chemical World

摘　　要：以凝胶网格法合成LaFeO3纳米气敏材料,用DTA-TG、XRD对材料进行了表征,DTA-TG分析结果显示LaFeO3最佳处理温度为800℃,XRD测定结果显示为钙钛矿型,由XRD图谱及Scherrer公式计算LaFeO3的表观晶粒大小约为15.3nm。气敏性测试表明LaFeO3测定三甲胺的最佳加热电压为5.5V,气敏元件的灵敏度随着气体浓度的增大而增大,但趋势变缓,并对三甲胺具有较高的选择性。LaFeO3 nanomaterial was prepared by gelatin gel-gridding method. DTA-TG and XRD were used to characterize the materials. DTA-TG showed the best treatment temperature of nano-LaFeO3 was 800℃. The result of XRD showed the material was perovskite-type and the apparent size o~ the grains was about 15.3 nm. The sensitivity test to TMA showed that the best heating voltage of LaFeOa nanomaterial was 5. 5 V. The sensitivity was affected by concentration of TMA, The nanomaterial had a gcod sensitivity to TMA.

关 键 词：铁酸镧纳米材料 凝胶网格法 气敏性能 甲硫醇 三甲氨 

分 类 号：TP212.2[自动化与计算机技术—检测技术与自动化装置]