Chloroform Gas Sensor Based on Chitosan Biopolymer

Abstract

Chloroform classified as one of the hazardous chemical to human. Therefore, monitoring the chloroform concentration in air is vital. In this study, chitosan powder was dissolved in 2% of acetic acid to form chitosan solution gel. It was subsequently deposited on printed circuit board (PCB) by using electrochemical deposition technique. The response of the chitosan sensor towards chloroform was tested via electrical testing by exposing different chloroform concentration ranging from 10 ppm, 20 ppm, 30 ppm, 40 ppm, and 50 ppm using air exposure technique. The response of the chitosan sensor towards chloroform was recorded as output voltage. Sensing properties of the chitosan sensor which include sensitivity, stability, recovery, and repeatability were studied. The electrical result showed that output voltage increases as the concentration of chloroform increases. All the sensing properties were achieved. The structure characterization of the chitosan was studied using Fourier Transform Infrared Spectroscopy (FTIR). The appearance of N-H and O-H groups in FTIR spectrum of chitosan film provides evidence that the domain functional group exist in chitosan after it was processed into film.

Review—Recent Progress, Challenges, and Trends in Polymer-Based Wearable Sensors

“…It has also been used as a biosensor due to its extraordinary film-forming properties and ability to retain its intrinsic properties. Chandrasa Karan et al 47 successfully employed an electrochemical deposition technique to construct a chitosan-based ammonia sensor with all the necessary qualities of a trustworthy sensor, such as repeatability, sensitivity, recovery, and speed in response to ammonia exposure. Furthermore, the capacity of a sensor to operate at room temperature with minimum energy consumption and manufacturing costs makes it a trustworthy sensor that may be used.…”

Recent Progress, Challenges, and Trends in Polymer-Based Sensors: A Review

“…Furthermore, it has been employed as a biosensor because of its remarkable film-forming characteristics and its ability to maintain its inherent features. Chandrasa Karan et al [ 31 ] used an electrochemical deposition approach to successfully create a chitosan-based ammonia sensor that has all the necessary characteristics of a dependable sensor, such as repeatability, sensitivity, recovery, and speed in response to ammonia exposure. Furthermore, a sensor’s capacity to function at room temperature with minimal energy consumption and fabrication costs makes it a dependable sensor that can be employed in a variety of applications.…”