【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.更多还原

【Abstract】 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 be 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.更多还原