Enhanced Photocatalytic Activity of WS2Film by Laser Drilling to Produce Porous WS2/WO3Heterostructure

Sainan Ma; Longlui Zeng; Lili Tao; Chun Yin Tang; Huiyu Yuan; Hui Long; Ping Kwong Cheng; Yang Chai; Chuansheng Chen; Kin Hung Fung; Xuming Zhang; Shu Ping Lau; Yuen Hong Tsang

doi:10.1038/s41598-017-03254-2

Enhanced Photocatalytic Activity of WS₂Film by Laser Drilling to Produce Porous WS₂/WO₃Heterostructure

Sainan Ma, Longlui Zeng, Lili Tao, Chun Yin Tang, Huiyu Yuan, Hui Long, Ping Kwong Cheng, Yang Chai, Chuansheng Chen, Kin Hung Fung, Xuming Zhang, Shu Ping Lau, Yuen Hong Tsang

Research output: Journal article publication › Journal article › Academic research › peer-review

35 Citations (Scopus)

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 WS2nanofilms with increased active edge sites; the proposed method promotes partial oxidation to fabricate WS2/WO3heterojunctions that enhance the separation of photogenerated electron-hole pairs. The WS2film after one, two, and three treatments exhibited photocurrent density of 3.9, 6.2, and 8 μA/cm2, respectively, reaching up to 31 times larger than that of pristine WS2film 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.

Original language	English
Article number	3125
Journal	Scientific Reports
Volume	7
Issue number	1
DOIs	https://doi.org/10.1038/s41598-017-03254-2
Publication status	Published - 1 Dec 2017

ASJC Scopus subject areas

General

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

More information

10.1038/s41598-017-03254-2

http://hdl.handle.net/10397/70571

Cite this

@article{05fec82d858b4fe6871722bc2efa0236,

title = "Enhanced Photocatalytic Activity of WS2Film by Laser Drilling to Produce Porous WS2/WO3Heterostructure",

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 WS2nanofilms with increased active edge sites; the proposed method promotes partial oxidation to fabricate WS2/WO3heterojunctions that enhance the separation of photogenerated electron-hole pairs. The WS2film after one, two, and three treatments exhibited photocurrent density of 3.9, 6.2, and 8 μA/cm2, respectively, reaching up to 31 times larger than that of pristine WS2film 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.",

author = "Sainan Ma and Longlui Zeng and Lili Tao and Tang, {Chun Yin} and Huiyu Yuan and Hui Long and Cheng, {Ping Kwong} and Yang Chai and Chuansheng Chen and Fung, {Kin Hung} and Xuming Zhang and Lau, {Shu Ping} and Tsang, {Yuen Hong}",

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AU - Ma, Sainan

AU - Zeng, Longlui

AU - Tao, Lili

AU - Tang, Chun Yin

AU - Yuan, Huiyu

AU - Long, Hui

AU - Cheng, Ping Kwong

AU - Chai, Yang

AU - Chen, Chuansheng

AU - Fung, Kin Hung

AU - Zhang, Xuming

AU - Lau, Shu Ping

AU - Tsang, Yuen Hong

PY - 2017/12/1

Y1 - 2017/12/1

N2 - 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 WS2nanofilms with increased active edge sites; the proposed method promotes partial oxidation to fabricate WS2/WO3heterojunctions that enhance the separation of photogenerated electron-hole pairs. The WS2film after one, two, and three treatments exhibited photocurrent density of 3.9, 6.2, and 8 μA/cm2, respectively, reaching up to 31 times larger than that of pristine WS2film 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.

AB - 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 WS2nanofilms with increased active edge sites; the proposed method promotes partial oxidation to fabricate WS2/WO3heterojunctions that enhance the separation of photogenerated electron-hole pairs. The WS2film after one, two, and three treatments exhibited photocurrent density of 3.9, 6.2, and 8 μA/cm2, respectively, reaching up to 31 times larger than that of pristine WS2film 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.

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