Dr. Jia Huang Profile

Dr. Jia Huang

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Proceedings Article | 22 October 2010 Paper

A novel chemically selective siloxane polymer for chemical vapor sensing

Jia Huang, Yadong Jiang, Xiaosong Du, Juan Bi

Proceedings Volume 7658, 76580W (2010) https://doi.org/10.1117/12.865523

KEYWORDS: Sensors, Polymers, Polymeric sensors, Crystals, FT-IR spectroscopy, Nitrogen, Quartz, Adsorption, Coating, Thin films

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A new hydrogen-bond acidic carbosiloxane polymer for quartz crystal microbalance sensors (QCMs) application was synthesized via O-alkylation, Claisen rearrange, hydrosilylation reaction and functionalized the polysiloxane with trifluoroacetone groups (TFA). The trifluoroisopropanol functionalized polysiloxane was characterized by FT-IR and ¹HNMR. And this novel siloxane polymer was coated onto AT-cut 8 MHz QCM sensors to investigate its gas sensitive responses to the organophosphorus nerve agent stimulant dimethyl methylphosphonate (DMMP) vapor as well as other interfering organic vapors. The research work indicated that frequency shifts of the trifluoroisopropanol functionalized polysiloxane based QCM sensor to the DMMP vapor were completely linear, and with a regression coefficient of 0.9973 in the concentration range of 10-60 ppm. In addition, the sensitivity of the fabricated QCM sensors to DMMP was up to 10.64 Hz/ ppm, and much higher than the other interfering vapors, limits of detection (LODs) of the QCM sensors was 0.28 ppm, thus high selectivity to DMMP was demonstrated in this work.

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