Effect of chitosan dissolved in different acetic acid concentration towards VOC sensing performance of quartz crystal microbalance overlay with chitosan

Lukman Hekiem, Nurul Liyana and Md Ralib, Aliza Aini and Mohd Hatta, Maziati Akmal and Ahmad, Farah B. and Nordin, Anis Nurashikin and Ab Rahim, Rosminazuin and Za'bah, Nor Farahidah (2021) Effect of chitosan dissolved in different acetic acid concentration towards VOC sensing performance of quartz crystal microbalance overlay with chitosan. Materials Letters, 291. pp. 1-4. ISSN 0167-577X

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Abstract

Improvement in sensing layer properties of quartz crystal microbalance (QCM) sensors are crucial in developing gas sensors with high sensitivity and selectivity. In this work, we study the use of chitosan thin film as the sensing layer on a QCM sensor to identify the presence of volatile organic compounds specifically isopropyl alcohol (IPA). The effect of chitosan dissolved in different acetic acid concentrations towards QCM overlay with chitosan sensing performance were studied. Characterization work on chitosan thin film at different acetic acid concentrations (1.0, 1.5, 2.0, 2.5% (v/v)) were performed by using FTIR and FESEM. Higher acid concentration led to a higher degree of protonation which results in a more progressive solubilization of chitosan and promotes smoother film. For chitosan layer dissolved in 2% acetic acid, the highest resonance frequency shift (99.3 Hz) was observed during the adsorption of the analyte gas molecules on QCM sensors. This can be explained by the increase in chitosan solubility and protonation. This indicates that difference acid concentration in chitosan dissolution affects the sensing performance during the presence of the analyte gas.

Item Type:	Article (Journal)
Additional Information:	7658/89875
Uncontrolled Keywords:	Biopolymers, Chitosan, Frequency shift, Piezoelectric, QCM sensor
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering Kulliyyah of Engineering > Department of Biotechnology Engineering Kulliyyah of Engineering > Department of Electrical and Computer Engineering Kulliyyah of Engineering > Department of Science
Depositing User:	Aliza Aini Md Ralib
Date Deposited:	24 May 2021 12:27
Last Modified:	24 May 2021 12:27
URI:	http://irep.iium.edu.my/id/eprint/89875

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