Green Synthesis of Graphene with Scalable Preparation from Waste Cooking Palm Oil Sensing Membrane

    Graphene is an exciting material composed of sp2 bonded carbon atoms in which the carbon atoms are arranged in a single layer,  creating honeycomb patterns [1]. It has attracted great interest due to its excellent properties such as large surface, ultimate high  charge-carrier mobility, ballistic transport, flexible and transparent [2]. In recent years, graphene is undoubtedly emerging as a prime  candidate for carbon-based electronic such as an optical device, chemical sensor, humidity sensor, energy storage and others [3]. Palm oil, referring to the oil extracted from the fruits of the palm tree [4]. Meanwhile, the term “waste cooking palm oil” (WCPO) refers  to vegetable oil which has recycled in frying food and no longer viable for its intended use [5]. In order to overcome the utilization of  non-renewable and toxicity, carbon species such as methane, acetylene, benzene, xylene, toluene, [6], waste cooking palm oil used as the carbon source in order to prepare graphene using double thermal chemical vapour deposition method.
    Nowadays, graphene grows to be new types of materials for the manufacturing of sensors [9]. Consequently, graphene from waste  cooking palm oil for manufacture sensing membrane such as humidity sensor is compulsory due to low cost, environmentally friendly  production, and more demanding in the industry.


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