Issue 32, 2012
From the journal:

Journal of Materials Chemistry

Freestanding monolithic silicon aerogels†

Ke Chen,ab   Zhihao Bao,*a   Jun Shen,a   Guangming Wu,a   Bin Zhou*a  and  Kenneth H. Sandhagec  

* Corresponding authors

a Shanghai Key Laboratory of Special Microstructure Materials and Technology, Tongji University, Shanghai 200092, China
E-mail: zbao@tongji.edu.cn, zhoubin863@tongji.edu.cn

b Key Laboratory for Special Functional Materials of Ministry of Education, Henan University, Kaifeng 475004, China

c School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, GA 30332, USA

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

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Article information

DOI
https://doi.org/10.1039/C2JM31662E
Article type
Communication
Submitted
17 Mar 2012
Accepted
24 Jun 2012
First published
13 Jul 2012

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

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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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