Fabrication of polymer-based gas sensor for volatile organic compound gases sensing

Muhammad ‘Azmi, Noor Athirah (2024) Fabrication of polymer-based gas sensor for volatile organic compound gases sensing. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Detecting VOC gases such as ethanol and acetone is a critical concern for public health and environmental safety, as prolonged exposure to ethanol vapour at the explosive limit volume of roughly 3.3% - 19% can cause nausea, skin rashes, and Parkinson’s disease. In contrast, exposure to acetone vapor can lead to symptoms like bronchitis, weariness, and organ damage. Therefore, a device such as a gas sensor is needed to detect the VOC gases. This project aims to develop a polymer-based gas sensor for volatile organic compounds and to analyse the characteristics of the sensor in terms of response, response time, and recovery time. This project used graphene as the sensing material, chitosan as the polymer, and Kapton as the substrate. Initially, the interdigitated electrode was deposited onto the substrates using screen-printing and annealed at 150 ⁰Ⅽ for 10 minutes. Afterward, the graphene paste was deposited on the electrode using the doctor blade and annealed at 150 ⁰Ⅽ for 30 minutes. SEM and Raman characterizations are carried out to verify the sensing material of the gas sensor. The results revealed that gas sensors prepared by paste B (T2-1, T2-2) exhibited better response to acetone and ethanol than paste A (T1-1, T1-2), with response values of 1.0703 and 1.1389, respectively. The faster response time towards acetone is T2-1- S3(2) (3 minutes), while in ethanol, it is T2-2-S1(1) (17 minutes). In conclusion, the polymer-based gas sensor produced better response toward acetone compared to ethanol.

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