Formaldehyde gas sensors based on a quartz crystal microbalance modified with aniline-doped polyvinyl acetate nanofibers

Sofa, Sintia Ainus and Roto, Roto and Aflaha, Rizky and Natsir, Taufik Abdillah and Humairah, Nur Aisyah and Kusumaatmaja, Ahmad and Triyana, Kuwat and Gupta, Ruchi (2023) Formaldehyde gas sensors based on a quartz crystal microbalance modified with aniline-doped polyvinyl acetate nanofibers. Analyst, 149 (4). pp. 1262-1270. ISSN 32654

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Abstract

Real-time detection of formaldehyde in the atmosphere remains challenging. The available gaseous formaldehyde sensing methods offer limited sensitivity, selectivity, and robustness. We modified a quartz crystal microbalance (QCM) system for selective detection of formaldehyde in air. The QCM surface was functionalized with polyvinyl acetate (PVAc) nanofibers and doped with 2, 4, and 6 wt% aniline to improve the selectivity and sensitivity of the sensor. The chemical content and morphological structure of PVAc nanofibers doped with aniline were confirmed by Fourier-transform infrared (FTIR) spectroscopy, energy-dispersive X-ray (EDX) spectroscopy, and scanning electron microscopy (SEM). The results showed that the modified QCM sensor had a sensitivity of 0.056 Hz ppm−1 with a response and recovery times of 200 s and 90 s, respectively. It gave limits of detection (LOD) and limit of quantification (LOQ) of 28 ppm and 96 ppm, respectively. Moreover, the modified QCM was selective towards formaldehyde compared to the other gases. The current workplace exposure limit (WEL) for formaldehyde is 2 ppm, with a time-weighted average over eight hours. Future work will focus on improving the reported QCM sensor to meet the required LOD for formaldehyde detection in the environment and industrial sites.

Item Type: Article
Uncontrolled Keywords: Formaldehyde gas sensors; quartz crystal microbalance, aniline-doped polyvinyl acetate nanofibers
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Mathematics and Natural Sciences > Physics Department
Depositing User: Wiyarsih Wiyarsih
Date Deposited: 17 Sep 2024 04:02
Last Modified: 17 Sep 2024 04:02
URI: https://ir.lib.ugm.ac.id/id/eprint/7080

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