Methane Gas Detection Using ZnO Coated on Tapered Optical Fiber
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.
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