@article{mahadi2025carbon,

title = {CARBON NANOTUBE-CHITOSAN THIN FILM ON QCM (QUARTZ CRYSTAL MICROBALANCE) FOR DETECTION OF IPA (ISOPROPYL ALCOHOL)},

author = {Aisyah Shafiqah Mahadi and Mohd Asyraf Mohd Razib and Aliza Aini Md Ralib and Farah Ahmad and Marmeezee Mohd Yusof},

url = {https://journals.iium.edu.my/bnrej/index.php/bnrej/article/view/123},

doi = {https://doi.org/10.31436/cnrej.v9i2.123},

year  = {2025},

date = {2025-12-28},

urldate = {2025-01-01},

journal = {Chemical and Natural Resources Engineering Journal (Formally known as Biological and Natural Resources Engineering Journal)},

volume = {9},

number = {2},

pages = {1–13},

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.},

keywords = {Chitosan, IPA, MWCNTs (Multi-Walled Carbon Nanotubes), Nanocomposite sensor, openQCM, Quartz Crystal Microbalance (QCM)},

pubstate = {published},

tppubtype = {article}

}