QCM Odor Sensor Noticed by Boilling Point of Odor Substances

Abstract

In this paper, a improved method for detecting odor samples using mono-channel QCM LB film sensor is described. The sensing film deposited on the QCM was DOABr combined by PVSK as an under layer. The odor sensor was able to detect the usual frequency shift, the resistance shift and more the response time related to the boiling point and volatile rate of odor substances. The gradient of the curve for frequency vs. resistance shift decreased as coefficient of viscosity rate. Single odor samples, such as benzene, hexane and chloroform can be detected by these parameters. Mixed odor samples such as three kind of odor substances could be also detected by adding the response time measurement.