Formation of Nanodimensional 3C-SiC Structures from Rice Husks

We have demonstrated that large quantities of beta-SiC nanostructures can be obtained from rice husk agricultural waste by using controlled conditions in a thermogravimetric setup. This simple and inexpensive method of producing these structures on a large scale is critical for applications in nanoelectronics, nanosensors, and biotechnology. The temperature and atmosphere are two critical elements in forming either alpha-cristobalite (SiO2) or beta-SiC. Using different characterization methods (x-ray diffraction, scanning electron microscopy, transmission electron microscopy, and Raman spectroscopy), we have shown that pyrolysis of rice husks in argon atmosphere at 1375A degrees C results in simultaneous formation of carbon nanotubes, beta-SiC nanowires/nanorods, and beta-SiC powder.