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Tr ithis paper, the growth of graphene on sapphire substrate was studied by the experimental preparation and simulation using chemical vapor deposition (CVD) method 􀀀 which focused on the effect of substrate surface morphology and growth temperature. The microstructure of graphene was investigated by atomic force microscope (AFM),X-ray diffraction (XRD) ？ field emission scanning electron microscope (FESEM) ？ Raman spectroscopy (Raman),and high resolution transmission electron microscope (HRTEM) respectively. The simulation results indicated that hydrogen had an important influence on the surface morphology of the substrate. Under the action of H atom ? the Al-() bond was elongated by 51.42% ? which was almost fractured ？ and it affected the surface roughness of the sapphire substrate. Tt was found that H had an etching effect on the surface of sapphire substrate？ and the surface roughness Ra of the etched sapphire substrate became larger, which made it difficult to grow graphene. When the growth temperature increased 􀀀 the quality of the graphene also became better. [ABSTRACT FROM AUTHOR]

In this paper, graphene was synthesized on sapphire substrate by chemical vapor deposition (CVD) method, and the effect of growth time on hydrophobic properties and microstructure of graphene was investigated. Contact-angle meter, Fourier transform infrared spectrometer, Raman spectrometer and field emission scanning electron microscopy were applied to study hydrophobic and microscopic structure of graphene, respectively. It shows that after growing 30 min, maximum contact angle of graphene is 129.96°, it presents hydrophobic properties. Meantime, infrared test shows only carbon-carbon double bonds. Raman analysis also indicates three characteristic peaks of graphene after growing 10-30 min. larger contact angle makes graphene as a potential hydrophobic material, and it can even be a promising superhydrophobic material by its hydrophobic modification. [ABSTRACT FROM AUTHOR]