Issue 32, 2012

Freestanding monolithic silicon aerogels

Abstract

The electrical, optical, and (bio)chemical properties of porous Si have attracted considerable interest for battery, solar cell, display, sensor, biomedical, and other applications. Free-standing monolithic Si aerogels have been generated for the first time via low-temperature magnesiothermic reduction of SiO2 aerogels. Under appropriate conditions, the reaction of Mg gas with SiO2 produced a co-continuous mixture of predominantly MgO and Si. Selective MgO dissolution then yielded nanocrystalline, porous, photoluminescent Si aerogels with a high degree of porosity (97.3 vol%) and a high specific surface area (615 m2 g−1).

Graphical abstract: Freestanding monolithic silicon aerogels

Supplementary files

Article information

Article type
Communication
Submitted
17 Mar 2012
Accepted
24 Jun 2012
First published
13 Jul 2012

J. Mater. Chem., 2012,22, 16196-16200

Freestanding monolithic silicon aerogels

K. Chen, Z. Bao, J. Shen, G. Wu, B. Zhou and K. H. Sandhage, J. Mater. Chem., 2012, 22, 16196 DOI: 10.1039/C2JM31662E

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