Applied whispering gallery modes on ZnO nanorods coated glass for humidity sensing application

Jali Mohd Hafiz; Abdul Rahim Hazli Rafis; Md Johari Md Ashadi; Sharif Maslinda Mat; Johari Siti Halma; Thokchom Siddharth; Mohamed Habibah; Yasin Moh; Harun Sulaiman Wadi

doi:10.1007/s11801-021-0109-3

Journals >Optoelectronics Letters >Volume 17 >Issue 5 >Page 298 > Article

Optoelectronics Letters
Vol. 17, Issue 5, 298 (2021)

Applied whispering gallery modes on ZnO nanorods coated glass for humidity sensing application

Jali Mohd Hafiz^1、2, Abdul Rahim Hazli Rafis³, Md Johari Md Ashadi^1、4, Sharif Maslinda Mat¹, Johari Siti Halma^1、4, Thokchom Siddharth⁵, Mohamed Habibah⁶, Yasin Moh⁷, and Harun Sulaiman Wadi^1、*

Author Affiliations

¹Department of Electrical Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia

²Faculty of Electrical Engineering, Universiti Teknikal Malaysia Melaka, Melaka 76100, Malaysia

³Faculty of Electronic and Computer Engineering, Universiti Teknikal Malaysia Melaka, Melaka 76100, Malaysia

⁴Faculty of Electrical and Electronic Engineering Technology, Universiti Teknikal Malaysia Melaka, Melaka 76100, Malaysia

⁵School of Technology, Assam Don Bosco University, Guwahati, Assam 781017, India

⁶Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, Kuala Lumpur 54100, Malaysia

⁷Department of Physics, Faculty of Science and Technology, Airlangga University, Surabaya, Indonesia

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DOI: 10.1007/s11801-021-0109-3 Cite this Article

Mohd Hafiz Jali, Hazli Rafis Abdul Rahim, Md Ashadi Md Johari, Maslinda Mat Sharif, Siti Halma Johari, Siddharth Thokchom, Habibah Mohamed, Moh Yasin, Sulaiman Wadi Harun. Applied whispering gallery modes on ZnO nanorods coated glass for humidity sensing application[J]. Optoelectronics Letters, 2021, 17(5): 298 Copy Citation Text

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Abstract

In this letter, a humidity sensor is demonstrated by applying a whispering gallery mode (WGM) from a microsphere resonator onto the ZnO nanorods coated glass surface. The diameter of the microsphere was 234 μm and the glass surface was coated with ZnO nanorods using the hydrothermal method at growth duration of 12 h. A significant response to humidity level ranging from 35%RH to 85%RH has been observed with the sensitivity of 0.014 2 nm/%RH. The proposed humidity sensor has successfully employed to enhance interaction between the whispering gallery mode evanescent and surrounds analyte with the assistance of ZnO nanorods coated glass.

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