Fabrication of Fast Responsive and Insensitive-Humidity Sensor Based on Polyaniline-WO3-CuCl2 for Hydrogen Sulfide Detection

Simple and low-cost hydrogen sulfide gas sensors based on polyaniline-copper chloride and polyaniline- tungsten trioxide- copper chloride composites were developed. The sensing film was produced by drop cast of the dispersed composite on top of screen-printed carbon electrodes on a flexible polyethy...

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Bibliographic Details
Published in:IEEE sensors journal 2021-04, Vol.21 (8), p.9716-9722
Main Authors: Belkhamssa, Najet, Ksibi, Mohamed, Shih, Andy, Izquierdo, Ricardo
Format: Article
Language:English
Subjects:
Chloride
Composite materials
Copper
Copper chloride
flexible gas sensor
Gas detectors
Gas sensors
Humidity
Hydrogen
Hydrogen sulfide
Industrial applications
polyaniline
Polyanilines
Polyethylene terephthalate
Resistance
Response time
Room temperature
Selectivity
Sensors
Substrates
Temperature sensors
tungsten oxide
Tungsten oxides
Voltage measurement
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Summary:Simple and low-cost hydrogen sulfide gas sensors based on polyaniline-copper chloride and polyaniline- tungsten trioxide- copper chloride composites were developed. The sensing film was produced by drop cast of the dispersed composite on top of screen-printed carbon electrodes on a flexible polyethylene terephthalate substrate. A fast onset time of detection of 10 s and 20 s towards 0.1 ppm of hydrogen sulfide were obtained for polyaniline-tungsten trioxide-copper chloride and polyaniline-copper chloride sensors, respectively. The calibration curve displays a good working range between 0.1 and 1 ppm with a limit of detection and limit of quantification of 155 and 512 ppb, respectively. The polyaniline-CuCl 2 sensor presented a high response to humidity change. In contrast, the incorporation of tungsten oxide into the polyaniline-CuCl 2 composite exhibited significantly improved the response time to target gas from 15 min to 4 min and make it nearly insensitive to humidity changes up to 40 %. Gas-sensing tests show that polyaniline- tungsten trioxide-copper chloride composites exhibit a high and fast response as well as an excellent selectivity to hydrogen sulfide at ppm level in room temperature. The proposed sensors could be used for different industrial applications.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2020.3019240