摘要
以钙钛矿结构SmFeO3薄膜材料为研究对象,以可溶性无机盐Sm(NO3)3.6H2O和Fe(NO3)3.9H2O等为主要原料,利用改进的溶胶-凝胶技术首先制备了纳米晶结构的SmFeO3薄膜材料,并以此为基础制备了旁热式气敏传感器。以TG-DSC分析讨论了前驱体热处理过程中的变化,用X射线衍射(XRD)分析了晶相结构,用扫描电子显微镜(SEM)表征了薄膜的表面形貌。试验发现利用该工艺在750℃烧结温度下,可以得到颗粒度均匀,尺寸在30 nm左右的钙钛矿结构SmFeO3薄膜材料。通过传感器对汽油-甲醇混合气体测试表明,SmFeO3材料对含15%～85%甲醇的汽油-甲醇混合气体具有较高的灵敏度,响应与恢复时间小于5 s。该研究工作对推动汽油-甲醇混合燃料在汽车等方面的应用奠定了基础。
Perovskite type SmFeO3 film was synthesized by a modified sol-gel method using soluble inorganic salts of Sm（NO3）3·6H2O and Fe（NO3）3·9H2O as raw materials.Based on the synthesized nano-crystalline SmFeO3 films,indirectly heated gas sensors were fabricated.The changes of precursor during sintering were analyzed by TG-DSC.The crystal phases were characterized by XRD,and the film surface topography were performed by SEM.The experiments showed 30 nm-crystal-size SmFeO3 of perovskite type with uniform particle size was obtained when the sintering temperature was 750℃.The sensitivity tests of the sensors to gasoline-methanol mixture gases showed： SmFeO3 materials had a good sensitivity to gasoline-methanol mixture gases with 15%—85% methanol,and both the response time and the recover time were less than 5 seconds.This work provides the foundation to promote the applications of gasoline-methanol mixture fuel to automobile.
出处
《化学工业与工程》
CAS
2011年第4期1-4,21,共5页
Chemical Industry and Engineering
基金
国家863项目:奇瑞新一代甲醇灵活燃料汽车开发(2008AA11A148)
