Preparation and characterization of SiC/C nano-composites

• Published in: Cai liao gong cheng = Journal of materials engineering no. 2; pp. 75 - 86
• Main Authors: Gan, Xiao-Rong, Xue, Fang-Hong, Huang, Hao, Dong, Xing-Long, Wang, Xiao-Yun, Yu, Hong-Tao, Liu, Yan-Ming, Quan, Xie
• Format: Journal Article
• Language: Chinese
• Published: 01.02.2014
• Subjects: Direct current; Morphology; Nanostructure; Particulate composites; Photocatalysis; Raw materials; Silicon carbide; Spectrometers
• ISSN: 1001-4381
• DOI: 10.3969/j.issn.1001-4381.2014.02.015

Using micrometer-sized graphite powder and Si powder as raw material, SiC/C nano-composites were in-situ synthesized by direct current arc-discharge plasma method with H(2) as reactive gas under the Ar atmosphere. The components of the obtained product were characterized by XRD, Raman and IR. The morphology and microstructure of the sample were observed by SEM and TEM. Optical absorption properties and photocatalytic ability in decomposition of methylene blue were tested respectively by UV-visible reflection spectrometer and UV-VIS spectrophotometer. The results indicate that the as-synthesized products are globular composites of SiC/C consisting of beta -SiC as main phase and a small amount of C; The average diameter of the composite is about 0.5-1 mu m, of which the thickness of C shell is 60 nm and the inner is SiC particles with average diameter of 50 nm. The band gap of the as-formed composites is 2.35 eV and which exhibit high electron mobility and certain photocatalytic ability.