Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2010-12-01

Journal: JOURNAL OF MATERIALS SCIENCE

Included Journals: Scopus、EI、SCIE

Volume: 45

Issue: 24

Page Number: 6769-6774

ISSN: 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.