Gas phase synthesis of graphene nanosheets in microwave plasma torch at atmospheric pressure and their properties
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| Year of publication | 2018 |
| Type | Conference abstract |
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| Description | Free-standing graphene nanosheets synthesis by ethanol decomposition in microwave plasma represents simple and environmentally friendly way of graphene production in the form of powder [1]. In our work microwave plasma torch (2.45 GHz, 200-1000 W) is used to synthesize graphene nanosheets in Ar (250-1000 sccm) discharge with ethanol (1-30 sccm) admixture. We use dual channel configuration of nozzle electrode with central Ar flow and precursor/Ar flow in secondary channel. During the synthesis well-balanced reaction scheme of C, O, H species is achieved leading to the growth of graphene nanosheets. The synthesized nanosheets are collected on silicon oxide substrate or from the tube wall (Fig 1.). The deposition process (discharge power, gas flows, substrate temperature) is investigated with aim to obtain maximum amount of single layer graphene. We also studied the growth of graphene directly on a dielectric substrate by insertion of Si/SiO2 substrate near the plasma discharge (Fig. 2.). The homogeneity and quality of graphene layer was investigated in dependence of substrate temperature and precursor flow. Plasma discharge is monitored by optical emission spectroscopy and prepared samples are analyzed by SEM, Raman spectroscopy and X-ray photoelectron spectroscopy. |
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