| 초록 |
The silica-coated graphene was synthesized using microwave irradiation in a liguid phase via sol-gel reaction in the presence of an ammonium catalyst. Microwave method is a timesaving and easy way to synthesize particles in uniform size. Polyvinylpyrrolidone (PVP) was used as a coupling agent and tetraethyl orthosilicate (TEOS) as the silica precursor. In this study, the effects of irradiation time and concentrations of a coupling agent on the properties of prepared graphene/SiO2 are discussed. The graphene coated with silica was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX) and fourier transform infrared spectroscopy (FT-IR). We suggested that rapid and homogeneous heating makes uniform silica coating on graphene in only 5 minutes. This novel silica/graphene would possibly be an electrical insulating filler with good thermal conductivity. |
