Multi-channel chitosan coated quartz crystal microbalance device for continuous detection of isopropyl alcohol

Mohd Mansor, Ahmad Fairuzabadi and Nordin, Anis Nurashikin and Muhamad Atan, Muhammad Khairul Faisal and Md Ralib @ Md Raghib, Aliza 'Aini and Lun, Hao Tung and Samsudin, Zambri (2026) Multi-channel chitosan coated quartz crystal microbalance device for continuous detection of isopropyl alcohol. In: 2025 10th International Conference on Computer and Communication Engineering (ICCCE), 26--27 August 2025, Kuala Lumpur.

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Abstract

Isopropyl alcohol (IPA) is a widely used volatile organic compound, yet its uncontrolled presence poses health and safety risks. This study presents the evaluation of a multichannel quartz crystal microbalance (QCM) sensor coated with chitosan for the real-time detection of IPA vapor. The sensor integrates three independent sensing units on a single substrate, fabricated using gold. A custom 3D-printed packaging system was also developed to enable gas flow channels for continuous monitoring. The chitosan coating, optimized between 1–10 µL, demonstrated effective interaction with IPA resulting in measurable frequency shifts. Experimental results revealed that sensor response was highly sensitive to IPA concentrations, with a linear detection range between 7.5–15 ppm (R² = 0.9806) and an estimated limit of detection (LOD) of 10.7 ppm. At higher concentrations, a logarithmic calibration model (R² = 0.949) captured saturation effects. The device exhibited rapid response (~10 s), reversibility, and stability, confirming its suitability for continuous air quality monitoring and industrial safety applications.

Item Type:	Proceeding Paper (Invited Papers)
Uncontrolled Keywords:	Gas Sensing, Quartz Crystal Microbalance (QCM), Chitosan, Isopropyl Alcohol Detection
Subjects:	T Technology > T Technology (General)
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
Depositing User:	Dr. Ahmad Fairuzabadi Mohd Mansor
Date Deposited:	23 Apr 2026 12:31
Last Modified:	23 Apr 2026 12:31
Queue Number:	2026-04-Q2909
URI:	http://irep.iium.edu.my/id/eprint/128442

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