纳米SmFeO_3的合成及其H2S敏感特性研究  

Synthesis and H_2S Gas Sensing Properties of SmFeO_3 Nano-sized Powder

作　　者：王焕新[1] 徐甲强[1] 程知萱[2] 潘庆谊[2] 

机构地区：[1]郑州轻工业学院材料与化学工程学院,河南郑州450002 [2]上海大学理学院,上海200444

出　　处：《传感技术学报》2006年第05B期2138-2141,共4页Chinese Journal of Sensors and Actuators

基　　金：河南省高校杰出科研人才创新工程资助(2003KYCX008);河南省杰出青年科学基金资助(03120000800)

摘　　要：以无机物K3[Fe(CN)6]和Sm2O3为原料,用热分解配合物前驱体法制备了复合氧化物SmFeO3纳米粉体.用X-射线粉末衍射仪(XRD)和透射电镜(TEM)对产物的物相、形貌进行了表征.结果显示:热分解法在煅烧温度为600℃即可生成纳米晶SmFeO3,TEM显示产物为均匀的椭球形颗粒,充分表明该方法制备的材料具有良好分散性,且纯度较高.将合成材料制备成旁热式气敏元件,气敏性能测试结果表明:合成材料对H2S具有高的灵敏度和选择性,在最佳工作电压4V时对50μL/LH2S气体的灵敏度可达21.3倍,相对干扰气体C2H5OH来讲其选择性系数为4.44倍,而且响应很快,约2s,但恢复稍慢,40s左右.Nanometer material of rare earth compound oxide SmFeO3 with the structure of perovskite type was synthesized by coordination complex thermal decomposition process, the precursor was prepared by precipitation method using inorganic compound K3[Fe（CN）6] and Sm2O3 as starting materials. The structure and crystal phase of the powder were determined using X-ray diffractometer （XRD）. The shape and size were analyzed with transmission electron microscopy （TEM）. The results of XRD and TEM analysis indicate that as-synthesized samples are pure SmFeO3 powders and their mean size is about 80 nm. Furthermore, the gas sensing properties of the gas sensor based on SmFeO3 nanocrystals were tested at static state. It can he seen that SmFeO3 nanocrystals show remarkable sensitivity and good selectivity to H2S. On the optimal working voltage of 4 V, its sensitivity to 50 μL/L H2S is up to 21.3, its selectivity against ethanol is up to 4. 44, and the response is about 2 s.

关 键 词：气体传感器 SmFeO3 配合物热分解 纳米材料 

分 类 号：TP212.2[自动化与计算机技术—检测技术与自动化装置]