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Issue 8, 2011
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Highly active and enhanced photocatalytic siliconnanowire arrays

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Abstract

Nanoporous and nonporous three-dimensional silicon nanowire arrays (SiNWAs) prepared with metal-assisted chemical etching method were investigated as photocatalysts in dye photodegradation systematically. In comparison with nonporous SiNWAs, nanoporous SiNWAs have higher surface area, larger pore volume, stronger light absorption and better photocatalytic activity. After the HF-treatment, the photocatalytic activity of all kinds of SiNWAs increased significantly and the nanoporous SiNWAs showed excellent stability. The photocatalytic activity of different types of SiNWAs with hydrogen surface termination can be recovered by HF treatment. This study also reveal that the hydrogen terminated surfaces on silicon nanowires (SiNWs) enhance the performance of SiNWAs by increasing their photocatalytic activity.

Graphical abstract: Highly active and enhanced photocatalytic silicon nanowire arrays

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Supplementary files

Article information


Submitted
11 Mar 2011
Accepted
19 May 2011
First published
30 Jun 2011

Nanoscale, 2011,3, 3269-3276
Article type
Paper

Highly active and enhanced photocatalytic silicon nanowire arrays

F. Wang, Q. Yang, G. Xu, N. Lei, Y. K. Tsang, N. Wong and J. C. Ho, Nanoscale, 2011, 3, 3269
DOI: 10.1039/C1NR10266D

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