新型甲醛多孔硅复合传感器的制备  

A Novel Porous Silicon Composite Sensor for Formaldehyde Detection

作　　者：王伟[1] 高扬 陶强 刘英姿 张娟琨[1] 

机构地区：[1]天津市工业微生物重点实验室,教育部工业微生物重点实验室,天津科技大学生物工程学院,天津300457

出　　处：《分析化学》2015年第6期849-855,共7页Chinese Journal of Analytical Chemistry

基　　金：天津市科委项目(No.14RCCFSF00140)资助

摘　　要：构建了一种简便、快速检测甲醛的新型钯-多孔硅（Pd-PS）复合传感器。采用水热腐蚀法制备多孔硅,通过扫描电镜表征其表面微结构。对多孔硅腐蚀条件进行了优化,得出多孔硅的最佳制备条件。多孔硅经化学浸渍法在其表面掺杂金属钯,进而制成了钯-多孔硅复合传感器。当此传感器被置于含甲醛的混合气体中时,可高选择性结合甲醛气体分子,并产生电信号,其强度与甲醛浓度相关,通过万用表检测其电信号,进而分析其气敏性能。检测结果表明,此传感器对甲醛气体敏感,且表现出良好的选择性,对乙醇、氨气、甲醇和丙酮不敏感。此传感器对甲醛浓度的检测范围在0.1~6.0 mg/m3之间,检出限为0.1 mg/m3,检测时间为3 min。A novel palladium-porous silicon （Pd-PS） composite detection was established. The porous silicon was prepared by micro-structure of porous silicon was characterized of porous silicon were optimized and the optimum sensor for convenient and fast formaldehyde hydrothermal etching method. The surface by scanning electron microscope. The corrosion conditions preparation conditions of porous silicon were obtained. In addition, by chemical immersion method,, the metal palladium was doped on the surface of porous silicon, and the palladium-porous silicon composite sensor was prepared finally. When the sensor was placed in the gas mixtures containing formaldehyde, it could high selectively bind to formaldehyde molecules. Subsequently, the sensor could generate electrochemical signals, the intensity of wich changed with the gas concentration. Then, by using the multimeter to detect the electrical signal, its gas sensing properties were analyzed. The experimental results indicated that the sensor was sensitive to formaldehyde with good selectivity, but was not sensitive to ethanol, ammonia, methanol and acetone. The detection rang of the sensor to formaldehyde concentration was 0.1-6.0 mg/m3 with the detection limit of 0.1 mg/m3, and the detection time was 3 min.

关 键 词：多孔硅制备 水热腐蚀法 甲醛 钯-多孔硅 气敏性能 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] R122.2[自动化与计算机技术—控制科学与工程]