Chemical sensors of monocyclic aromatic hydrocarbons based on sol-gel materials:: kinetics of trapping of the pollutants and sensitivity of the sensor

被引：17

作者：

Calvo-Muñoz, ML ^{[1
]}

Truong, TT ^{[1
]}

Tran-Thi, TH ^{[1
]}

机构：

[1] CEA Saclay, CNRS URA 2453, Lab Francis Perrin,DSM, SPAM,DRECAM, F-91191 Gif Sur Yvette, France

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2002年 / 87卷 / 01期

关键词：

chemical sensor; benzene; toluene; optical detection; porous materials; sol-gel process;

D O I：

10.1016/S0925-4005(02)00236-8

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

We report the study of the trapping process of benzene and toluene in porous, hybrid organic-inorganic materials prepared via the sol-gel process. In particular, the kinetics of diffusion of the pollutants within the matrices are studied as functions of the composition, polarity and thickness of the matrix. The concentrations of the pollutants in the air are directly measured via their absorbance in the UV, using three different protocols of exposure of the sensor to the pollutants. A threshold of detection of 60 ppb is achieved when the sensor is a monolith of hybrid TMOS/MeTMOS of stoichiometry 9/1. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：173 / 183

页数：11

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