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Indexed by:期刊论文

Date of Publication:2010-12-01

Journal:JOURNAL OF MATERIALS SCIENCE

Included Journals:SCIE、EI、Scopus

Volume:45

Issue:24

Page Number:6769-6774

ISSN No.:0022-2461

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 degrees 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 N(2) adsorption and desorption analysis indicate that the surface area is around 308 m(2) g(-1) and the single point pore volume is 0.37 cm(3) 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.