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

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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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Authors and Affiliations

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

    Mohd Hafiz Jali, Md Ashadi Md Johari, Maslinda Mat Sharif, Siti Halma Johari & Sulaiman Wadi Harun

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

    Mohd Hafiz Jali

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

    Hazli Rafis Abdul Rahim

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

    Md Ashadi Md Johari & Siti Halma Johari

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

    Siddharth Thokchom

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

    Habibah Mohamed

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

    Moh Yasin

Authors
  1. Mohd Hafiz Jali
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  2. Hazli Rafis Abdul Rahim
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  3. Md Ashadi Md Johari
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  4. Maslinda Mat Sharif
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  5. Siti Halma Johari
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  6. Siddharth Thokchom
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  7. Habibah Mohamed
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  8. Moh Yasin
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  9. Sulaiman Wadi Harun
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Correspondence to Sulaiman Wadi Harun.

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Jali, M.H., Rahim, H.R.A., Md Johari, M.A. et al. Applied whispering gallery modes on ZnO nanorods coated glass for humidity sensing application. Optoelectron. Lett. 17, 298–301 (2021). https://doi.org/10.1007/s11801-021-0109-3

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  • DOI: https://doi.org/10.1007/s11801-021-0109-3

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