Mahadi, Aisyah Syafiqah and Mohd Razib, Mohd Asyraf and Md Ralib, Aliza Aini and Ahmad, Farah and Mohd Yusoff, Marmeezee (2025) Carbon nanotube-chitosan thin film on QCM (quartz crystal microbalance) for detection of IPA (isopropyl alcohol). Biological and Natural Resources Engineering Journal, 9 (2). pp. 1-13. E-ISSN 2637-0719
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Abstract
This study presents the development of a quartz crystal microbalance (QCM) sensor coated with a multi-walled carbon nanotube–chitosan (MWCNT-COOH/CS) composite for the detection of isopropyl (IPA) vapor, a common volatile organic compound (VOC). The composite was synthesized via glutaraldehyde crosslinking to enhance bonding between carboxyl-functionalized MWCNTs and chitosan, followed by sonication and stirring to ensure uniform dispersion. Material characterization was carried out using Raman spectroscopy, Fourier-transform infrared spectroscopy (FTIR), and field-emission scanning electron microscopy (FESEM), confirming successful integration and interaction between MWCNTs and CS. Static QCM analysis showed that the MWCNT-COOH/CS composite achieved a balanced frequency shift of approximately 106 Hz with a response time of ~40 seconds, outperforming standalone CS and MWCNT layers in terms of response speed and signal stability. Dynamic measurements across IPA concentrations from 300 to 700 ppm revealed a linear frequency shift trend with a correlation coefficient (R²) of 0.9713. Compared with similar sensors reported in the literature, the developed composite exhibits promising sensitivity, faster response time, and ease of fabrication, suggesting strong potential for real-time VOC monitoring applications
| Item Type: | Article (Journal) |
|---|---|
| Uncontrolled Keywords: | Biosensor, Sensing Layer, QCM, VOCs, IPA |
| Subjects: | T Technology > TP Chemical technology > TP1080 Polymers, plastics and their manufacture |
| Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): | Kulliyyah of Engineering Kulliyyah of Engineering > Department of Electrical and Computer Engineering Kulliyyah of Engineering > Department of Mechatronics Engineering |
| Depositing User: | Dr Mohd Asyraf Mohd Razib |
| Date Deposited: | 27 Jan 2026 14:51 |
| Last Modified: | 27 Jan 2026 14:51 |
| Queue Number: | 2026-01-Q1863 |
| URI: | http://irep.iium.edu.my/id/eprint/127106 |
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