Abstract
Hybrid carbon nanotubes (CNTs), SiC nanowires and Si2N2O nanowires on three-dimensional (3D) hierarchical porous SiO2 were obtained from rice husk (RH) as a biomorphic structural template and raw materials through in-situ catalytic pyrolysis reaction. The samples with these one-dimensional/three-dimensional (1D/3D) combined structures were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and the Brunauer-Emmett-Teller surface areas measurements. Abundant 1D nanomaterial was obtained in biomorphic porous SiO2 which presents a hierarchical macro- and microporous structure. The results showed that temperature and metal nickel organic coordination had a remarkable influence on the composition, the morphology and the quantity of produced 1D nanostructures. The CNTs were obtained at 1200°C, whereas the SiC and Si2N2O nanowires were obtained at 1300°C. The 1D/3D nano-structured samples had larger surface area than rice husk ash. The formation mechanism of 1D/3D combined nanostructure has been discussed.
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