摘要
为了研发对甲醛有着良好敏感性能的材料,以锡粒和浓硝酸为原料,采用硝酸氧化法制备出前驱体,分别掺杂质量分数为7%的Li,Pb,Sb,Pd,并在600℃下灼烧。通过XRD、TEM等对产物进行表征,采用静态配气法测试其气敏性能。结果表明:SnO2纳米粉体中掺杂Pb元素可显著提高材料对甲醛的灵敏度和选择性,在3 V工作电压下对浓度为5ppm(1 ppm=10-6)的甲醛气体灵敏度达到24.539,响应时间为4 s,恢复时间为5 s.
In order to research materials which have good gas-sensing properties to HCHO,tin and concentrated nitric acid were taken as raw materials.The precursor was prepared via HNO3 oxidation,and 7 wt% Li,Pb,Sb,Pd were added into the precursor as dopants respectively,then all the precursors were calcined at 600 ℃.The nanometer doped SnO2 were analyzed by XRD and TEM.Their gas-sensing properties were tested through valve static method.And the results show that Pb doped SnO2 has the excellent sensitivity and selectivity to HCHO,its sensitivity to 5 ppm HCHO at the working voltage 3 V could reach to 24.539 with the response time 4 s and the recovery time 5 s.
出处
《仪表技术与传感器》
CSCD
北大核心
2011年第4期6-7,16,共3页
Instrument Technique and Sensor
基金
河南师范大学2008年大学生创新性实验计划项目(2008033)
河南省教育厅自然科学基金项目(2008B430011)
