ENVIRONMENTAL MONITORING OF ORGANIC ACIDS GAS BY IONIC LIQUID COATED QCM SENSOR

摘要

Organic pollutant gases can cause severe damage to both materials and people and have received much attention as a problem in the indoor environment. In this paper, l-butyl-3-methylimidazolium chloride (C_4mimCl) was employed as sensing material coated on quartz crystal micro-balance (QCM) for the detection of organic vapors. The experimental results indicated that the C_4mimCl/QCM sensor showed fast response, excellent sensitivity and good re-producibility towards organic acids. There was a good linear relationship between the frequency response and the testing concentration of these organic acid vapors. The results also indicated that C_4mimCl/QCM sensor could be a good candidate for the real-time detection of organic acid vapors.