| 초록 |
In order to endow graphite with electrical insulation property, graphite flake has been coated with amorphous silica spheres by the physical adsorption of poly(vinyl pyrrolidone) (PVP) between graphite and silica. First, a small amount of PVP was physically adsorbed on the graphite flakes in water. Second, amorphous silica spheres were synthesized from tetraethyl orthosilicate (TEOS) by an ammonia-catalyzed sol-gel reaction and physically linked with PVP on graphite surface in ethanol. This study primarily concentrates on the controllable surface resistivity of silica-coated graphite varying the amount of the adsorbed PVP on graphite and the silica on PVP/graphite composite. Characterization of the final product was carried out by means of scanning electron microscope (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FT-IR) and resistivity meter. |
