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http://dx.doi.org/10.3795/KSME-B.2016.40.3.149

Photonic-Crystal-Based Thin Film Sensor for Detecting Volatile Organic Compounds  

Chang, Hyung-Kwan (Dept. of Mechanical Engineering, Sogang Univ.)
Park, Jungyul (Dept. of Mechanical Engineering, Sogang Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.40, no.3, 2016 , pp. 149-155 More about this Journal
Abstract
Early detection of toxic gases, such as volatile organic compounds (VOCs), is important for safety and environmental protection. However, the conventional detection methods require long-term measurement times and expensive equipment. In this study, we propose a thin-film-type chemical sensor for VOCs, which consists of self-assembled monosize nanoparticles for 3-D photonic crystal structures and polydimthylsiloxane (PDMS) film. It is operated without any external power source, is truly portable, and has a fast response time. The structure color of the sensor changes when it is exposed to VOCs, because VOCs induce a swelling of the PDMS. Therefore, using this principle of color change, we can create a thin-film sensor for immediate detection of various types of VOCs. The proposed device evidences that a fast response time of just seconds, along with a clear color change, are successfully observed when the sensor is exposed to gas-phase VOCs.
Keywords
Photonic Crystal; Volatile Organic Compounds; Polydimethylsiloxane(PDMS);
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