Methane Gas Detection Using ZnO Coated on Tapered Optical Fiber

  • Nor Akmar Mohd Yahya University Malaysia of Computer Science and Engineering, 63000 Cyberjaya, Malaysia
  • Mohd Hanif Yaacob Wireless and Photonics Networks Research Center, Faculty of Engineering, Universiti Putra Malaysia, 43400 Serdang
  • Mohd Adzir Mahdi Wireless and Photonics Networks Research Center, Faculty of Engineering, Universiti Putra Malaysia, 43400 Serdang
Keywords: Gas Sensors, Optical Sensors, Sensing Material, Zinc Oxide


Zinc Oxide (ZnO) is one of the semiconductor materials used as a sensing layer for various detection purpose and one of them is to detect methane gas. In this work, an optical fiber sensor coated with ZnO was developed to detect methane (CH4) gas. The ZnO layer was synthesized and deposited onto tapered optical fiber via drop cast method. The characterisation of synthesized ZnO was performed via SEM and EDX to verify the material properties. The developed sensor with 750 nm thickness of coated ZnO is then tested towards 0.5%, 0.75% and 1.0% concentration of methane gas at room temperature. The absorbance response observed during the sensing is correspond to the change of methane gas concentration. It was found that the sensor showed highest sensitivity when exposed to 1% concentration and lowest sensitivity for 0.5% of methane gas. The response and recovery time for 1% methane gas exposure was recorded to be around 2.0 minutes and 3.0 minutes, respectively. The developed ZnO sensor using optical fiber has showed sensitivity towards CH4 gas at certain level of concentration.


Allsop, T., Kundrat, V., Kalli, K., Lee, G. B., Neal, R., Bond, P., Shi, B., Sullivan, J., Culverhouse, P., & Webb D. J. (2018). Methane detection scheme based upon the changing optical constants of a zinc oxide/platinum matrix created by a redox reaction and their effect upon surface plasmons, Sensors and Actuators B: Chemical, 255(1), 843-853.
Bhattacharyya, P., Basu, P.K., Saha, H., & Basu, S. (2007). Fast response methane sensor using nanocrystalline zinc oxide thin films derived by sol–gel method, Sensors and Actuators B: Chemical, 124(1).
Bhattacharyya, P., Basu, P.K., Mondal, B., & Saha H. (2018). A low power MEMS gas sensor based on nanocrystalline ZnO thin films for sensing methane, Microelectronics Reliability, 48(11-12), 1772-1779.
Cheng, X.L., Zhao, H., Huo, L.H., Gao, S., & Zhao, J.G. (2004). ZnO nanoparticulate thin film: preparation, characterization and gas-sensing property, Sensors and Actuators B, 102, 248–252.
Hoo, Y. L. Liu, S. H. Ho, L., & Jin, W. (2010). Fast Response Microstructured Optical Fiber Methane Sensor With Multiple Side-Openings. IEEE Photonics Technology Letters, 22(5), 296-298.
Korotcenkov, G. (2005). Gas response control through structural and chemical modification of metal oxide films: state of the art and approaches, Sensors and Actuators B, 107, 209–232.
Lokman, A., Harun, S.W., Harith, Z., Rafaie, H.A., Nor, R.M., & Arof, H. (2015). Inline Mach–Zehnder interferometer with ZnO nanowires coating for the measurement of uric acid concentrations, Sensors and Actuators A: Physical, 234, 206-211.
Nanto, H., Sokooshi, H., & Usuda, T., (1993). Smell sensor using aluminium doped zinc-oxide thin-film prepared by sputtering technique, Sensors and Actuators B, 10, 79–83.
Nunes, P., Fortunato, E., Lopes, A., & Martins, R. (2001). Influence of the deposition conditions on the gas sensitivity of zinc oxide thin films deposited by spray pyrolysis, International Journal of Inorganic Materials, 3, 1129–1131.
Paraguay, D.F., Miki-Yoshida, M., Morales, J., Solis, J., & Estrada, L.W. (2000). Influence of Al, In, Cu, Fe and Sn dopants on the response of thin film ZnO gas sensor to ethanol vapour, Thin Solid Films, 373, 137–140.
Pishdadian, S., & Shariati Ghaleno, M. (2013). Influences of Annealing Temperature on the optical and Structural Properties of Manganese Oxide Thin Film by Zn Doping from Sol-Gel Technique. Acta Physica Polonica A, 123, 741–745.
Renganathan, B., Sastikumar, D., Gobi, G., Yogamalar, N. R., & Bose, A. C. (2011). Optics & Laser Technology Nanocrystalline ZnO coated fiber optic sensor for ammonia gas detection. Optical Laser Technology, 43(8), 1398–1404.
Saito S., Miyayama, M., Koumoto, K., & Yanagida H. (1985). Gas sensing characteristics of porous ZnO and Pt/ZnO ceramics, Journal of the American Ceramic Society, 68, 40–43.
Seiyama, T., & Kato A. (1962). A new detector for gaseous components using semiconductor thin film, Analytical Chemistry, 34, 1502–1503.
Tai, H., Yoshino, T., & Tanaka, H. (1987). Fiber-optic evanescent-wave methane-gas sensor using optical absorption for the 3.392-μm line of a He–Ne laser. Optical Letters, 12, 437-439.
Yahya, N. A. M., Ibrahim, S. A., Rahman, N. A., Mahdi, M. A., & Yaacob M. H. (2018). Metal Oxide Based Optical Fiber for Methane Gas Detection, Pertanika Journal of Scholarly Research Reviews, 3(3), 97-101.
Yahya, N. A. M., Hamid, M. R. Y., Ong, B. H., Rahman, N. A., Mahdi, M. A., & Yaacob, M. H. (2020). H2 Gas Sensor Based on Pd/ZnO Nanostructures Deposited on Tapered Optical Fiber, IEEE Sensors Journal, 20 (6), 2982-2990.
Yang, Y., Wanga, X., Yi, G., Li, H., Shi, C., Sun, G., & Zhang, Z. (2019). Hydrothermally synthesized ZnO hierarchical structure for lower concentration methane sensing, Materials Letters, 254, 242-245.
Yi, J., Lee, J. M., & Park, W. I. (2011). Vertically aligned ZnO nanorods and graphene hybrid architectures for high-sensitive flexible gas sensors, Sensors and Actuators B: Chemical, 155(1), 264-269.
How to Cite
Mohd Yahya, N. A., Yaacob, M. H., & Mahdi, M. A. (2021). Methane Gas Detection Using ZnO Coated on Tapered Optical Fiber. Selangor Science & Technology Review (SeSTeR), 5(2), 9-16. Retrieved from