The influence of methane and hydrogen concentration as well as temperature of synthesis on the number of layers, area of coverage, and quality of graphene formed by chemical vapor deposition on copper is studied in this paper. It is shown that methane concentration primarily affects the sample coverage area. The temperature determines the number of graphene layers and the defect rate of graphene planes. The influence of hydrogen concentration is complex: low hydrogen concentrations are insufficient to induce efficient decomposition of methane on the copper surface; high concentrations of hydrogen limit nucleation of graphene layers and the formed graphene structures are subject to etching.
In this work, we have studied the characteristics of a heater based on single-layer graphene obtained by CVD using methane as the carbon precursor and using copper as a catalytic substrate. Synthesized graphene was transferred onto an EVA/PET substrate using a heat press printing method. A theoretical model of heating a polycrystalline graphene film was developed. The temperature gradients in graphene crystallites were estimated based on the model. It was shown that local overheating of graphene crystallite boundaries is the main cause of damage for the graphene-based heater. In order to enhance the power of graphene heaters, it is necessary to reduce the size of 2D graphene crystallites that make up the coating.
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