基于β-环糊精/TiO_2纳米粒多孔敏感膜的压电石英微天平有机气体传感器  

Quartz crystal microbalance sensor for detection of organic vapours based on β-cyclodextrine and nanocrystalline TiO_2 porous film

作　　者：司士辉[1] 陈寒芳[1] 周光红[1] 罗集[1] 

机构地区：[1]中南大学化学化工学院,湖南长沙410083

出　　处：《贵州工业大学学报（自然科学版）》2002年第5期41-44,共4页Journal of Guizhou University of Technology(Natural Science Edition)

基　　金：教育部骨干教师资助项目;中南大学文理基金资助项目 (校内编号 :0 110 -918;2 0 0 0 -0 2 2 )

摘　　要：采用压电石英微天平、红外吸收光谱技术对 β -环糊精在TiO2 纳米粒多孔膜上固载过程进行了研究。基于TiO2 纳米粒多孔膜 ,实现了 β -环糊精在压电石英晶体表面的高容量固载 (约 4 μg·cm- 2 )。β -环糊精 /TiO2 纳米粒膜修饰的压电传感器检测苯环化合物蒸气具有响应时间快、可重复使用、灵敏度高的特性 ;2 5℃下 ,对于氯苯、硝基苯、O -二甲苯 ,m -二甲苯 ,p -二甲苯的检测下限分别为 12 0ng·ml- 1、10 0ng·ml- 1、4 0ng·ml- 1、4 0ng·ml- 1、4 0ng·ml- 1,响应时间约为 1min .含量为其 10倍的丙酮、乙醚。Immobilization of β-cyclodextrine onto nanocrystalline TiO 2 porous film was characterized by using quartz crystal microbalance and FT-IR techniques. The amount of immobilized β-cyclodextrine on the surface of quartz crystal was estimated about 4μg·cm -2 by using nanocrystalline TiO 2 porous film as matrix. With the present method, β-cyclodextrine modified quartz crystal microbalance sensor has some advantages for the detection of aromatic organic vapours, such as shorter response time, good reversibility and high sensitivity. At 25℃, the detection limits were found to be 120 ng·ml -1,100 ng·ml -1, 40 ng·ml -1 for chlorobenzene, nitrobenzene and (o/p/m)-xylene, respectively, and the response time was within 1 min. In comparison with acetone, ethanol and ether, the more than 10-fold response of the sensor developed was observed for the detection of p-xylene.

关 键 词：有机气体传感器 TiO2纳米微粒 Β-环糊精 压电石英微天平 苯环化合物 

分 类 号：TP212.2[自动化与计算机技术—检测技术与自动化装置] O625.1[自动化与计算机技术—控制科学与工程]