摘要
采用分析纯的ZnAc2.2H2O和SnCl4.5H2O作为起始原料,控制适当的pH值和离子浓度,在200℃温度条件下水热法反应24 h得到Zn2SnO4微粉;通过浸渍法制备了Pd、Au、La掺杂的Zn2SnO4粉体;利用X射线衍射仪(XRD)、透射电镜(TEM)对合成材料的结构、尺寸和形态进行了表征;采用静态配气法测试了材料的气敏性能。结果表明:在200℃水热条件下可直接合成Zn2SnO4,所得材料是比较规整的立方晶型,粒径大约为200 nm,纯Zn2SnO4对H2S、乙醇蒸气、乙醇汽油等有机蒸气具有较好的灵敏度,通过金属离子掺杂能明显提高材料对乙醇蒸气、乙醇汽油等气体的灵敏度和选择性。
Using analytically pure ZnAc2·2H2O （AP） and SnCl4·5H2O （AP） as raw materials, Zn2SnO4 was synthesized via hydrothermal method at the temperature of 200℃ for 24 hours under proper ions concentration and pH value, then Zn2SnO4 can be obtained after separating, washing the white paste. Pd, as well as Au and La, doped- Zn2SnO4 gas sensing materials were made by means of impregnation. The micropowder was characterized by X-ray diffraction （XRD） and Transmission electron microscopy （TEM）. As a result, the crystal of Zn2SnO4 has good crystalline and Well-degree of dispersion and small diameter. The diameter is about 200nm. The gas sensitivity of the material was also test, the results show that the as-prepared powder has good sensitivity to H2S and C2H5OH, and other organic steam. In order to improve the gas sensing properties of the materials, the noble metal Pd and Au and rare earth La were added to the materials through dipping method, its gas sensitivity to ethanol and ethanol petrol can be obviously improved by doping noble metal Pd.
出处
《传感技术学报》
CAS
CSCD
北大核心
2005年第4期693-696,共4页
Chinese Journal of Sensors and Actuators
基金
河南省杰出青年科学基金(0312000800)
国家自然科学基金(20471055)
作者简介
徐甲强（1963-），男，河南卫辉人，博士，教授，主要从事纳米材料与气体传感器的研究，xjq450002@yahoo．com．cn
