ZnO nanorods coated tapered U-shape plastic optical fiber for relative humidity detection

Johari, Siti Halma and Cheak, Tiu Zian and Rahim, Hazli Rafis Abdul and Jali, Mohd Hafiz and Yusof, Haziezol Helmi Mohd and Johari, Md Ashadi Md and Yasin, Moh and Harun, Sulaiman Wadi (2022) ZnO nanorods coated tapered U-shape plastic optical fiber for relative humidity detection. Photonics, 9 (11). ISSN 2304-6732, DOI https://doi.org/10.3390/photonics9110796.

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A relative humidity sensor was fabricated by exploiting an evanescent wave (EW) on a U-bent tapered plastic optical fiber (POF) coated with zinc oxide (ZnO) nanorods. The POF was tapered manually using a polishing method to a diameter of 0.5 mm, a length of 5 cm, and a radius of 5 cm. ZnO nanorods were synthesized using a hydrothermal method and grown on the POF by a seeding process for 12 h. A significant response of the sensor was observed when the sensor was exposed to 35 to 90%RH due to the intense chemisorption process and changeable relative index in the POF. The sensitivity and resolution of the sensor have been improved by factors of 1.23 and 2.18, respectively, compared to the conventional tapered POF sensor without ZnO coating. Besides, the ZnO-coated sensor also exhibited better repeatability properties in terms of output voltage when exposed to 35 to 90%RH for three repeated measurements. The obtained results revealed that the proposed new POF sensor has an excellent sensing performance as an RH sensor in terms of sensitivity, repeatability, and stability properties.

Item Type: Article
Funders: Malaysian Ministry of Higher Education through Fundamental Research Grant Scheme (Grant No: FP114-2020)
Uncontrolled Keywords: Evanescence wave sensor; Tapered plastic optical fiber; Zinc oxide nanorods; Humidity sensing
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering > Department of Electrical Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 10 Nov 2023 08:45
Last Modified: 10 Nov 2023 08:45
URI: http://eprints.um.edu.my/id/eprint/40742

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