Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (11): 2719-2725.doi: 10.3866/PKU.WHXB20111110

• PHYSICAL CHEMISTRY OF MATERIALS • Previous Articles     Next Articles

Confined Synthesis and Properties of Porous Silicon from Silica Aerogel Templates by Magnesiothermic Reduction

CHEN Ke, BAO Zhi-Hao, LIU Dong, ZHU Xiu-Rong, ZHANG Zhi-Hua, ZHOU Bin   

  1. Shanghai Key Laboratory of Special Microstructure Materials and Technology, Tongji University, Shanghai 200092, P. R. China
  • Received:2011-07-18 Revised:2011-08-25 Published:2011-10-27
  • Contact: ZHOU Bin
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (51072137, 50802064), National Science & Technology Pillar Program, China (2009BAC62B02), Program for New Century Excellent Talents in University, China (NCET-08-0405), and Research Fund for the Doctoral Program of Ministry of Education of China (20090072110047, 20100072110054).

Abstract: Novel nanoporous silicon was successfully converted from SiO2 aerogels by a template-confined magnesiothermic reduction at low temperature (650°C) based on a gas-solid reaction. The composition, crystal structure, morphology, and pore structure of the samples were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and Brunauer-Emmett- Teller (BET) surface area analysis. Their optical and electrochemical properties were also investigated. The results indicated that the products consisted of nanocrystalline silicon, retained a morphology similar to that of the original templates, and possessed a specific surface area as high as 602 m2·g-1. They also showed red photoluminescence at room temperature and had a high capacity and good Li-ion insertion/extraction properties for use in lithium ion batteries.

Key words: Porous silicon, Template-confined, Magnesiothermic reduction, Aerogel, High specific surface area