Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/70571
Title: Enhanced photocatalytic activity of WS2 film by laser drilling to produce porous WS2/WO3 heterostructure
Authors: Ma, SN 
Zeng, LL 
Tao, LL 
Tang, CY 
Yuan, HY 
Long, H 
Cheng, PK 
Chai, Y 
Chen, CS 
Fung, KH 
Zhang, XM 
Lau, SP 
Tsang, YH 
Issue Date: 2017
Source: Scientific reports, 9 2017, v. 7, no. , 3125, p. 1-9
Abstract: Methods and mechanisms for improvement of photocatalytic activity, are important and popular research topics for renewable energy production and waste water treatment. Here, we demonstrate a facile laser drilling method for engineering well-aligned pore arrays on magnetron-sputtered WS2 nanofilms with increased active edge sites; the proposed method promotes partial oxidation to fabricate WS2/WO3 heterojunctions that enhance the separation of photogenerated electron-hole pairs. The WS2 film after one, two, and three treatments exhibited photocurrent density of 3.9, 6.2, and 8 mu A/cm(2), respectively, reaching up to 31 times larger than that of pristine WS2 film along with greatly improved charge recombination kinetics. The unprecedented combinational roles of laser drilling revealed in this study in regards to geometric tailoring, chemical transformation, and heterojunction positioning for WS2- based composite nanomaterials create a foundation for further enhancing the performance of other 2D transition metal dichalcogenides in photocatalysis via laser treatment.
Publisher: Nature Publishing Group
Journal: Scientific reports 
ISSN: 2045-2322
DOI: 10.1038/s41598-017-03254-2
Rights: Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
© The Author(s) 2017
The following publication Ma, S., Zeng, L., Tao, L. et al. Enhanced Photocatalytic Activity of WS2 Film by Laser Drilling to Produce Porous WS2/WO3 Heterostructure. Sci Rep 7, 3125 (2017) is available at https://dx.doi.org/10.1038/s41598-017-03254-2
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