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Sensors 2016, 16(4), 423; doi:10.3390/s16040423

Poly(3-Methylthiophene) Thin Films Deposited Electrochemically on QCMs for the Sensing of Volatile Organic Compounds

1
Faculty of Engineering, Fatih Sultan Mehmet Vakif University, Istanbul 34080, Turkey
2
Department of Physics, Mus Alparslan University, Mus 49100, Turkey
3
Science Faculty, Department of Physics, Gebze Technical University, Kocaeli 41400, Turkey
4
Materials Institute, TUBITAK Marmara Research Center, Gebze 41470, Turkey
5
Mechatronics Engineering Department and Nanotechnology Application & Research Center, Nigde University, Nigde 51245, Turkey
*
Author to whom correspondence should be addressed.
Academic Editor: Russell Binions
Received: 8 February 2016 / Revised: 16 March 2016 / Accepted: 18 March 2016 / Published: 23 March 2016
(This article belongs to the Special Issue Sensors for Environmental Monitoring 2016)
View Full-Text   |   Download PDF [5313 KB, uploaded 23 March 2016]   |  

Abstract

Poly(3-methylthiophene) (PMeT) thin films were electrochemically deposited on quartz crystal microbalance QCM transducers to investigate their volatile organic compound (VOC) sensing properties depending on ambient conditions. Twelve different VOCs including alcohols, ketones, chlorinated compounds, amines, and the organosphosphate dimethyl methylphosphonate (DMMP) were used as analytes. The responses of the chemical sensors against DMMP were the highest among the tested analytes; thus, fabricated chemical sensors based on PMeT can be evaluated as potential candidates for selectively detecting DMMP. Generally, detection limits in the low ppm range could be achieved. The gas sensing measurements were recorded at various humid air conditions to investigate the effects of the humidity on the gas sensing properties. The sensing performance of the chemical sensors was slightly reduced in the presence of humidity in ambient conditions. While a decrease in sensitivity was observed for humidity levels up to 50% r.h., the sensitivity was nearly unaffected for higher humidity levels and a reliable detection of the VOCs and DMMP was possible with detection limits in the low ppm range. View Full-Text
Keywords: chemical gas sensor; poly(3-methylthiophene); humid air; electrochemical deposition; QCM; VOCs; DMMP chemical gas sensor; poly(3-methylthiophene); humid air; electrochemical deposition; QCM; VOCs; DMMP
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Öztürk, S.; Kösemen, A.; Şen, Z.; Kılınç, N.; Harbeck, M. Poly(3-Methylthiophene) Thin Films Deposited Electrochemically on QCMs for the Sensing of Volatile Organic Compounds. Sensors 2016, 16, 423.

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