| 초록 |
In this study, carbon nanofibers were coated with sillica layer prepared by hydrolysis of TEOS (Tetraethyl orthosilicate). The carbon nanofibers were grown by chemical vapor deposition on C-fiber textiles deposited with Ni and Cu catalyst via electrophoretic deposition. The carbon nanofibers were oxidized by nitric acid before carbon nanofiber was coated by silica via the hydrolysis of TEOS. Due to oxidation, hydroxyl group was created on carbon nanofiber and that was used as an activation site for SiO2. The physicochemical properties of grown carbon nanofibers were investigated by SEM, XRD. The structures of SiO2-coated carbon nanofibers were characterized by Raman, XRD, XPS and TEM. It is verified that catalyst particles were the most evenly deposited on C-fiber textiles by electrophoretic deposition under the condition of 8 volts for 20 minutes. Carbon nanofibers grew to an average diameter of 33nm and the SiO2 thin film is successfully coated onto the surface of grown CNFs. SiO2/CNFs composites exhibited a specific capacity of 2050 mAh/g at the initial discharge and a specific capacity of 1295 mAh/g at 29cycles. Acknowledgments: This research was financially supported by the Ministry of Education (MOE) and the National Research Foundation of Korea (NRF) through the Human Resource Training Project for Regional Innovation (NO.2012026209). |
