| Summary: | In this research, graphene was synthesized from an abundance of waste cooking palm oil (WCPO) and utilized as a humidity sensing film. Using WCPO as a precursor and the double thermal chemical vapour deposition method, graphene was successfully deposited on a nickel substrate. The growth of graphene film, resulting in the highest of I2D/IG (0.41) and lowest of ID/IG (0.02) since, the carbon atoms segregate and form multilayers graphene with high crystalline and low defective structure. Subsequently, multilayer of graphene on nickel was transferred onto glass substrate by poly (methyl methacrylate) polymer for humidity sensor application. The response-recovery time, sensitivity, and repeatability of humidity sensor were determined using humidity chamber under exposure of 40 to 90% RH. The response times for the adsorption and desorption processes are 597 and 503 s, respectively. This is attributed by the high sheet resistant of multilayer graphene (MLG). Meanwhile, the sensitivity at 40% to 90% RH, is 365%. MLG-based humidity sensor remains constant and similar at fifth cycles, indicating that the sensor has an excellent repeatability and has potential as a sensing material based on low cost and renewable energy. © 2023, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.
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