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Synthesis and characterization of mesoporous silicon directly from pure silica sodalite single crystal
Authors:Jiang Zhu  Jian Wu  Yu Wang  Changgong Meng
Affiliation:(1) Chemistry Department, Dalian University of Technology, Dalian, 116023, China;
Abstract:Mesoporous silicon granules with high surface area were synthesized directly from pure silica sodalite single crystals, with the starting shape retained. The sodalite single crystals were reduced by a magnesiothermal process in vacuum at 630 °C. The X-ray diffraction patterns indicate the presence of crystal silicon. Transmission electron microscopy studies reveal that the obtained silicon granules are composed of a monocrystalline surface with an island-like mesoporous internal structure. The results of N2 adsorption and desorption analysis indicate that the surface area is around 308 m2 g−1 and the single point pore volume is 0.37 cm3 g−1. The photoluminescence emission centered at 2.7 eV may be due to both an oxidized surface and quantum confinement effects. These results reveal that the silicon granules possess a different microstructure from those of etched silicon films. The present synthetic design correlates the microporous zeolite and mesoporous silicon together and gives a new way for enlarging the structural diversity of porous silicon crystal.
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