Physisorption mechanism in a novel ionogel membrane based CO2 gas sensor

The steadily increasing concentration of carbon dioxide (CO 2 ) gas in the atmosphere is a significant environmental problem in modern society. Henceforth, there is triggering interest in the new technological solutions for CO 2 monitoring. This work reports the fabrication of a novel, low cost, che...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2021-10, Vol.32 (20), p.25164-25174
Main Authors: Hussan, K. P. Safna, Moidu, Haroon Hussain, Thayyil, Mohamed Shahin, Jinitha, T. V., Antony, Anu, Govindaraj, G.
Format: Article
Language:English
Subjects:
Air quality
Carbon dioxide
Carbon dioxide concentration
Characterization and Evaluation of Materials
Chemistry and Materials Science
Gas sensors
Gases
Ion currents
Materials Science
Membranes
Optical and Electronic Materials
Quality control
Response rates
Selectivity
Sensors
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Summary:The steadily increasing concentration of carbon dioxide (CO 2 ) gas in the atmosphere is a significant environmental problem in modern society. Henceforth, there is triggering interest in the new technological solutions for CO 2 monitoring. This work reports the fabrication of a novel, low cost, chemiresistive carbon dioxide sensor based on the PVA/[EMIM][SCN] based ionogel membrane. Here, the lightweight transparent ionogel membrane with enhanced ionic conductivity is acted as the electrically conductive region of the sensor. The response rate of the CO 2 sensor was monitored in terms of direct as well as alternating current resistance using a high-precision multimeter and an impedance spectroscopy, respectively. The CO 2 desorption kinetics were also studied to check the reliability of the sensor using the conductometric approach. The selectivity of the sensor for CO 2 gas was well evidently quantified by comparing the response rate of the sensor with both CO 2 and N 2 gases. The optical microscopic images were periodically taken before and after CO 2 exposure in conjunction with the conductivity data revealed the physisorption mechanism of the sensor. The upshots presented herein will promote the development of an organic CO 2 gas sensor, which will be worthwhile for numerous industrial and practical applications and for air quality control in the future.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-021-06973-5