Formaldehyde Sensor With Enhanced Performance Using Microsphere Resonator-Coupled ZnO Nanorods Coated Glass

Harun, Sulaiman Wadi and Yasin, M. and Md Johari, Md Ashadi and Johari, Siti Halma and Jali, Mohd Hafiz and Abdul Rahim, Hazli Rafis and Mohamad Ali, Ummu Umairah and Mohamed, Habibah (2021) Formaldehyde Sensor With Enhanced Performance Using Microsphere Resonator-Coupled ZnO Nanorods Coated Glass. Optics and Laser Technology, 139. pp. 1-10. ISSN 0030-3992

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Abstract

An enhanced formaldehyde (CH2O) sensor incorporating microsphere resonator and zinc oxide (ZnO) nanorods coated glass is reported. The microsphere resonator with a diameter of 234 µm and the ZnO nanorods coated glass surface was fabricated using the hydrothermal synthesis method for 12 h. A significant response to formaldehyde concentration levels ranging from 0 ppm to 0.18 ppm was observed. Sensitivity improves by a factor of 1.84 and 1.33 in terms of output power and wavelength shift, respectively, compared to straight microfiber laid on the ZnO coated glass substrate. It produces exceptionally good resolution with 0.0031 ppm as compared to its counterpart with 0.0058 ppm. The proposed formaldehyde sensor utilizes a high energy density behaviour of a microsphere resonator for evanescent field coupling with the surrounding analyte. It also possesses a robust chemisorption process on the ZnO nanorods surface to enhance the sensitivity towards formaldehyde vapour. Besides improving performance, it exhibits a simple approach that reduced the complexity to handle the microfiber during the synthesis process. This proposed technique has shown excellent experiment results for formaldehyde sensing applications.

Item Type:	Article
Uncontrolled Keywords:	Formaldehyde Sensor, Zinc Oxide, Microsphere Resonator
Divisions:	Faculty of Electrical Engineering > Department of Diploma Studies
Depositing User:	Norfaradilla Idayu Ab. Ghafar
Date Deposited:	10 Mar 2022 15:01
Last Modified:	10 Mar 2022 15:01
URI:	http://eprints.utem.edu.my/id/eprint/25622
Statistic Details:	View Download Statistic

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