We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Synthesis of Silicon Carbide Nanowires from a Hybrid of Amorphous Biopolymer and Sol–Gel-Derived Silica.
- Authors
Mishra, Shivani B.; Mishra, Ajay K.; Krause, Rui W.; Mamba, Bhekie B.
- Abstract
We report here the formation of silicon carbide (SiC) nanowires from inorganic–organic hybrid of sol–gel-derived silica and the commercially available lignin that is naturally abundant amorphous biopolymer. This organic–inorganic hybrid material in the absence of catalyst was carbothermally reduced for a period of 1 h at 1400°C in inert atmosphere followed by oxidization. The nanostructures were characterized by scanning electron microscopy and high resolution scanning electron microscopy, which show the continuous formation of β-SiC nanowires in the range of 50–200 nm diameter and length of few micrometers. Transmission electron microscopy revealed Y-shaped structures (branched) of the nanowires grown in the direction of parallel to the [100] plane having two heads and one leg. The nanowires were formed with joints that were formed at regular intervals as circular rings. The deposition of silica layer on the outer surface of the nanowires was also observed. According to the X-ray diffraction pattern, peaks at 2θ=35.9° and 59.8° indicate the formation of β-SiC and a sharp peak at 2θ=22.1° suggests the presence of unreacted crystalline silica (crystoballite). The Raman shifts for β-SiC appeared as small peaks at 795.6 and 983.1 cm−1, respectively. The characteristic vibration of SiC at 795 cm−1 in Fourier transform infrared spectroscopy was also observed.
- Subjects
SILICON carbide; BIOPOLYMERS; NANOWIRES; NANOSTRUCTURED materials; SILICON compounds; ELECTRON microscopy; TRANSMISSION electron microscopy; NANOSTRUCTURES; SCANNING electron microscopy
- Publication
Journal of the American Ceramic Society, 2009, Vol 92, Issue 12, p3052
- ISSN
0002-7820
- Publication type
Article
- DOI
10.1111/j.1551-2916.2009.03332.x