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Cross-Selectivity Enhancement of Poly(vinylidene fluoride-hexafluoropropylene)-Based Sensor Arrays for Detecting
Ali Daneshkhah1,2, Sudhir Shrestha3,4,5, Amanda Siegel6
1Department of Electrical and Computer Engineering, Indiana University-Purdue University Indianapolis (IUPUI), Indianapolis, IN 46202, USA. alidane@umail.iu.edu.
Sensors (Basel, Switzerland)
|March 16, 2017
Summary
Two methods enhance the cross-selectivity of poly(vinylidene fluoride-hexafluoropropylene)/carbon black (PVDF-HFP/CB) resistive sensors for detecting acetone and ethanol. These techniques improve sensor performance and offer a roadmap for developing selective gas sensor arrays.
Area of Science:
- Materials Science
- Chemical Engineering
- Sensor Technology
Background:
- Porous poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) and carbon black (CB) composites are utilized in resistive sensors.
- Enhancing the cross-selectivity of these sensors for different analytes, such as acetone and ethanol, is crucial for practical applications.
Purpose of the Study:
- To develop and evaluate two distinct methods for improving the cross-selectivity of PVDF-HFP/CB composite-based resistive sensors.
- To investigate the impact of surface modification and additive incorporation on sensor response to acetone and ethanol in humid air.
Main Methods:
- Method I involved altering adsorption properties by adding a polyethylene oxide (PEO) layer or using infrared (IR) treatment.
- Method II focused on enhancing analyte interactions by incorporating diethylene carbonate (DEC) or PEO/DEC mixtures into the sensing film.
Main Results:
- Method I approaches modified the adsorption capabilities of the PVDF-HFP/CB composite.
- Method II approaches influenced the composite's transduction characteristics.
- Sensor response to acetone increased by 89%, while response to ethanol varied significantly (decreased by 57% or increased by 197%) depending on the method.
Conclusions:
- The study demonstrates facile methods to enhance the sensitivity and cross-selectivity of PVDF-HFP/CB sensors.
- The presented approaches provide a framework for developing selective gas sensor arrays by optimizing individual sensor units.
