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Catalysts 2017, 7(12), 371; doi:10.3390/catal7120371

Enhanced Photodegradation Activity of Hydrogen-Terminated Si Nanowires Arrays with Different-Oriented Crystal Phases

1
College of Physics and Cultivation Base for State Key Laboratory, Qingdao University, Qingdao 266071, China
2
National Institution Materials Society, 1-2-1 Sengen, Tsukuba, Ibaraki 3050047, Japan
3
School of Materials Science and Engineering Shandong, University of Science and Technology, Qingdao 266590, China
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Received: 14 October 2017 / Revised: 22 November 2017 / Accepted: 25 November 2017 / Published: 1 December 2017
(This article belongs to the Special Issue Nanostructured Materials for Applications in Heterogeneous Catalysis)
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Abstract

Although Si nanowires (NWs) arrays are superior candidates for visible light photocatalysis, reports about the photodegradation activity of various crystal-orientated Si NWs are still insufficient. Here, light-doped hydrogen-terminated Si NWs arrays with different crystal orientations were prepared via a metal-assisted chemical etching method (MACE), which simply modulated the concentration of the oxidizer, H2O2. Their dye photodegradation activities were systematically and comprehensively investigated. When compared with Si NWs arrays with crystal orientations of (110) and (111), Si NWs arrays with (100) crystal orientation exhibit a superior photodegradation activity and stability due to the anisotropy of optical and physical properties. The n-type Si NWs arrays exhibit better photodegradation activity than the p-type Si NWs arrays of the same crystal orientation and similar length. The results provide a further understanding of the synthesis of Si NWs arrays with various orientations, and the relationships between photodegradation activity/stability and crystal orientations. View Full-Text
Keywords: metal-assisted chemical etching method; Si nanowires; crystal orientations; visible-light photodegradation activity metal-assisted chemical etching method; Si nanowires; crystal orientations; visible-light photodegradation activity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Song, L.; Luo, L.; Song, J.; Zhang, H.; Li, X.; Cheng, S.; Jin, W.; Tang, J.; Liu, L.; Wang, F. Enhanced Photodegradation Activity of Hydrogen-Terminated Si Nanowires Arrays with Different-Oriented Crystal Phases. Catalysts 2017, 7, 371.

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