Growth of SiC nanowires on wooden template surface using molten salt media

• Published in: Applied surface science Vol. 320; pp. 620 - 626
• Main Authors: Ding, Jun, Zhu, Hongxi, Li, Guangqiang, Deng, Chengji, Li, Jun
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 30-11-2014; Elsevier
• Subjects: Biomorphic ceramic; Carbon template; Cellular; Ceramics; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Fused salts; Molten salt; Morphology; Nanowires; Physics; Pore size distribution; Scanning electron microscopy; Silicon; Silicon carbide; Biomorphic ceramic; Carbon template; Pore size distribution; Molten salt; Pore size; Silicon carbide; Inorganic compounds; Molten salts; Nanowires; Carbon; Nanostructured materials
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2014.09.149

•Biomorphic SiC/C ceramics have been produced using a relatively low temperature by molten salt method.•The resulting biomorphic SiC ceramic retains the original structures of wooden template.•The pore size distribution within the porous SiC/C ceramics was determined by automatic mercury porosimetry.
This paper examines the growth of SiC nanowires on a wooden template surface through the reaction of wooden template/silicon composites in static argon atmosphere, using molten salt media. The effects of temperature and salt/Si ratio on the growth of wooden template were investigated. Morphology and structure of the biomorphic SiC/C ceramics were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). The pore size distribution within the porous SiC/C ceramics was investigated using automatic mercury porosimetry. The results show that the biomorphic cellular morphology of wooden template was remained in the porous SiC ceramic with high precision that consists of β-SiC with traces of α-SiC. SiC in the wooden template exists in the cellular pores in the form of nanowires. The SiC nanowires were formed at about 1250°C by molten salt reaction between Si and C during the wooden-to-ceramic conversion.