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Updated: Jun 28, 2026

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Published on: January 22, 2020
Organic vapor detection by quartz crystal microbalance modified with mixed multilayer Langmuir-Blodgett Films
1Department of Chemistry, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore.
Abstract:
Mixed chloroform solution of Polysiloxane PS-264 and stearic acid was made into multilayer Langmuir-Blodgett (LB) films on the surface of quartz crystal microbalance (QCM). The condition for forming mixed multilayer LB films is discussed in this paper. In addition, PS-264, stearic acid and their mixture (molar ratio 1:1) were coated on the surface of QCM sensors by a spin coating method. The above modified crystals were exposed to different concentrations of various organic vapors, including related chlorinated hydrocarbons and alcohol vapors. The results of frequency changes corresponding to concentration change of the above vapors were compared. The linear regression coefficients of the QCM with LB film had better values (0.9881
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