| 초록 |
Silicon alkoxide is the typical precursor used in the synthesis of graphene-silica composites; however, it is a toxic and relatively expensive material. Sodium silicate solution, on the other hand, is used industrially as a precursor in sol-gel processes for the production of silica. It is water-soluble and cheaper than silicon alkoxide and may be a suitable replacement in the preparation of graphene-silica composites. Graphene oxide/sodium silicate (G-O/Na2SiO3) sols were prepared from different concentrations of sodium silicate solutions and the pH of the sols was varied using HCl. The properties of the reduced G-O/Na2SiO3 (rG-O/Na2SiO3) nanocomposites formed from the sols were investigated by Field emission scanning electron microscopy (FE-SEM), Energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) patterns, Raman, X-ray photoelectron spectroscopy (XPS), and sheet resistance analyses. The most stable G-O/Na2SiO3 sol was formed at pH 11, using 0.1 g of sodium silicate solution. We confirmed that the rG-O/Na2SiO3 nanocomposite contains particles with irregular shapes and sizes of a few hundred nanometers. The rG-O/Na2SiO3 nanocomposite also exhibited the lowest sheet resistance of 255.8Ω/□. |
