TiO₂纳微孔膜增敏的压电石英晶体传感器

来源期刊：中南大学学报(自然科学版)2002年第5期

论文作者：司士辉 朱德荣 陈昕

文章页码：477 - 479

关键词：TiO₂纳微孔膜;β-环糊精;压电石英晶体;苯环化合物

Key words：nano/microporous TiO₂films;β-cyclodextrine; piezoelectric crystal sensor; aromatic organics

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4μg/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1 min,检测浓度下限可低至40 ng/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.

Abstract: Nano/microporous TiO₂ films prepared from nanocrystalline TiO₂ particles have high specific surface area and good permeability. Nano/microporous TiO₂ 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 4μg/cm². The present piezoelectric gas sensor is successfully employed to detect benzene, toluene, chlorobenzene, nitrobenzene, o-xy-lene, m-xylene and p-xylene vapors with the detection limit down to 40 n g/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.