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Sensors 2017, 17(3), 595; doi:10.3390/s17030595

Cross-Selectivity Enhancement of Poly(vinylidene fluoride-hexafluoropropylene)-Based Sensor Arrays for Detecting Acetone and Ethanol

1
Department of Electrical and Computer Engineering, Indiana University–Purdue University Indianapolis (IUPUI), Indianapolis, IN 46202, USA
2
Integrated Nanosystems Development Institute (INDI), Indiana University–Purdue University Indianapolis (IUPUI), Indianapolis, IN 46202, USA
3
Department of Mechanical Engineering, Indiana University–Purdue University Indianapolis (IUPUI), Indianapolis, IN 46202, USA
4
Present Address: Department of Electrical and Computer Engineering, College of Engineering and Computing, Miami University, Oxford, OH 45056, USA
*
Author to whom correspondence should be addressed.
Academic Editor: W. Rudolf Seitz
Received: 14 November 2016 / Revised: 2 March 2017 / Accepted: 6 March 2017 / Published: 15 March 2017
(This article belongs to the Section Chemical Sensors)
View Full-Text   |   Download PDF [3879 KB, uploaded 15 March 2017]   |  

Abstract

Two methods for cross-selectivity enhancement of porous poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP)/carbon black (CB) composite-based resistive sensors are provided. The sensors are tested with acetone and ethanol in the presence of humid air. Cross-selectivity is enhanced using two different methods to modify the basic response of the PVDF-HFP/CB sensing platform. In method I, the adsorption properties of PVDF-HFP/CB are altered by adding a polyethylene oxide (PEO) layer or by treating with infrared (IR). In method II, the effects of the interaction of acetone and ethanol are enhanced by adding diethylene carbonate (DEC) or PEO dispersed in DEC (PEO/DEC) to the film. The results suggest the approaches used in method I alter the composite ability to adsorb acetone and ethanol, while in method II, they alter the transduction characteristics of the composite. Using these approaches, sensor relative response to acetone was increased by 89% compared with the PVDF-HFP/CB untreated film, whereas sensor relative response to ethanol could be decreased by 57% or increased by 197%. Not only do these results demonstrate facile methods for increasing sensitivity of PVDF-HFP/CB film, used in parallel they demonstrate a roadmap for enhancing system cross-selectivity that can be applied to separate units on an array. Fabrication methods, experimental procedures and results are presented and discussed. View Full-Text
Keywords: acetone sensor; ethanol sensor; volatile organic compounds; PVDF-HFP/carbon black composite; low water sensitivity acetone sensor; ethanol sensor; volatile organic compounds; PVDF-HFP/carbon black composite; low water sensitivity
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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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Daneshkhah, A.; Shrestha, S.; Siegel, A.; Varahramyan, K.; Agarwal, M. Cross-Selectivity Enhancement of Poly(vinylidene fluoride-hexafluoropropylene)-Based Sensor Arrays for Detecting Acetone and Ethanol. Sensors 2017, 17, 595.

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