TiO_2纳微孔膜增敏的压电石英晶体传感器  

Improvement of piezoelectric crystal sensor with TiO_2 nano/microporous films

作　　者：司士辉[1] 朱德荣[1] 陈昕[1] 

机构地区：[1]中南大学化学化工学院,湖南长沙410083

出　　处：《中南工业大学学报》2002年第5期477-479,共3页Journal of Central South University of Technology(Natural Science)

基　　金：国家教育部高等学校骨干教师基金资助项目 (教技司 [2 0 0 0 ] 14 3号 )

摘　　要：TiO2 纳米粒形成的纳微多孔膜具有比表面积大、透气性好的特点 .采用TiO2 纳微多孔膜作为传感膜基体 ,可将 β 环糊精有效地固定在压电石英晶体表面 ,固载容量约为 4 μg cm2 .β 环糊精 TiO2 膜修饰的压电传感器对苯、甲苯、氯苯、硝基苯、o 二甲苯、m 二甲苯、p 二甲苯气体检测时响应时间为 1min ,检测浓度下限可低至 4 0ng mL .TiO2纳米粒涂层为提高压电化学传感器的灵敏度和缩短响应时间提供了一种新方法 .Nano/microporous TiO_2 films prepared from nanocrystalline TiO_2 particles have high specific surface area and good permeability. Nano/microporous TiO_2 films are used as substrate for the immobilization of β-cyclodextrine onto the surface of piezoelectric crystal, and the amount of immobilized β-cyclodextrine is estimated at about 4 μg/cm2. The present piezoelectric gas sensor is successfully employed to detect benzene, toluene, chlorobenzene, nitrobenzene, o-xylene, m-xylene and p-xylene vapors with the detection limit down to 40 ng/mL. Application of such coatings in piezoelectric crystal chemical sensors should undoubtedly lead to improvements in performance of sensors, such as the response time and the sensitivity.

关 键 词：压电石英晶体传感器 TiO2纳微孔膜 Β-环糊精 苯环化合物 增敏作用 纳米关系 

分 类 号：TP212.2[自动化与计算机技术—检测技术与自动化装置]