PPy/PMMA/PEG-based sensor for low-concentration acetone detection

A. Daneshkhah; S. Shrestha; M. Agarwal; K. Varahramyan

doi:10.1117/12.2050623

22 May 2014 PPy/PMMA/PEG-based sensor for low-concentration acetone detection

A. Daneshkhah, S. Shrestha, M. Agarwal, K. Varahramyan

Proceedings Volume 9107, Smart Biomedical and Physiological Sensor Technology XI; 910712 (2014) https://doi.org/10.1117/12.2050623
Event: SPIE Sensing Technology + Applications, 2014, Baltimore, MD, United States

Abstract

A polymer pellet-based sensor device comprised of polypyrrole (PPy), polymethyl methacrylate (PMMA) and polyethylene glycol (PEG), its fabrication methods, and the experimental results for low-concentration acetone detection are presented. The design consists of a double layer pellet, where the top layer consists of PPy/PMMA and the bottom layer is composed of PPy/PMMA/PEG. Both sets of material compositions are synthesized by readily realizable chemical polymerization techniques. The mechanism of the sensor operation is based on the change in resistance of PPy and the swelling of PMMA when exposed to acetone, thereby changing the resistance of the layers. The resistances measured on the two layers, and across the pellet, are taken as the three output signals of the sensor. Because the PPy/PMMA and PPy/PMMA/PEG layers respond differently to acetone, as well as to other volatile organic compounds, it is demonstrated that the three output signals can allow the presented sensor to have a better sensitivity and selectivity than previously reported devices. Materials characterizations show formation of new composite with PPy/PMMA/PEG. Material response at various concentrations of acetone was conducted using quartz crystal microbalance (QCM). It was observed that the frequency decreased by 98 Hz for 290 ppm of acetone and by 411 Hz for 1160 ppm. Experimental results with a double layer pellet of PPy/PMMA and PPy/PMMA/PEG show an improved selectivity of acetone over ethanol. The reported acetone sensor is applicable for biomedical and other applications.

Citation Download Citation

A. Daneshkhah, S. Shrestha, M. Agarwal, and K. Varahramyan "PPy/PMMA/PEG-based sensor for low-concentration acetone detection", Proc. SPIE 9107, Smart Biomedical and Physiological Sensor Technology XI, 910712 (22 May 2014); https://doi.org/10.1117/12.2050623

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