纳米SnO_2传感器制备新工艺研究

Research on new technology of nanometer tin dioxide sensor

采用化学沉淀法制备的纳米SnO2粉体,通过表面包覆阴离子活性剂十二烷基苯磺酸钠(DBS)来达到表面修饰的目的。实验结果发现:用DBS直接包覆Sn(OH)4粉体制备的纳米SnO2微粒,其粒径比Sn(OH)4沉淀前包覆DBS工艺制备的SnO2粉体的粒径小,并进行了傅立叶变换红外光谱分析、X射线衍射分析、透射电子显微分析和比表面分析及气敏性能测试。结果表明:在Sn(OH)4沉淀前后的不同时间,加入DBS所制得晶粒尺寸相差较大。用DBS直接包覆普通Sn(OH)4,能制备出粒径更小的SnO2微粒,其传感器具有更高的灵敏度和选择性,这是比以往更改进的制备方法。

Tin dioxide powders are prepared by the chemical precipitation method. Thereinto nano-SnO2 powder is admixed with surface negative ion active solvent dodecyl benzene sulfonic acid sodium salt （DBS） to reach the purpose of surface modifying. Experiment results discover it produced by mixing ordinary Sn （OH）4 with DBS is smaller than other powder in diameter. In addition, these powders is researched by Fourier transform infrared spectrophoto, X-ray diffraction spectrum, transmission electric microscope, specific area measurement and gas sensing properties measurement. Results show the two consequent powders scales differ fairly, which are identified with doping DBS into complex aqueous solution before or behind Sn（OH） 4 precipitating. The obtained results show that sample made by ordinary Sn （OH） 4 enwrapped with DBS, behind Sn （OH） 4 precipitating, has smaller size, and its sensor has high sensitivity and selectivity. It is a more improved method than before.