2D WS2/carbon dot hybrids with enhanced photocatalytic activity

Atkin, P, Daeneke, T, Wang, Y, Carey, B, Berean, K, Clark, R, Ou, J, Trinchi, A, Cole, I and Kalantar Zadeh, K 2016, '2D WS2/carbon dot hybrids with enhanced photocatalytic activity', Journal of Materials Chemistry A, vol. 4, no. 35, pp. 13563-13571.


Document type: Journal Article
Collection: Journal Articles

Title 2D WS2/carbon dot hybrids with enhanced photocatalytic activity
Author(s) Atkin, P
Daeneke, T
Wang, Y
Carey, B
Berean, K
Clark, R
Ou, J
Trinchi, A
Cole, I
Kalantar Zadeh, K
Year 2016
Journal name Journal of Materials Chemistry A
Volume number 4
Issue number 35
Start page 13563
End page 13571
Total pages 9
Publisher Royal Society of Chemistry
Abstract Two-dimensional (2D) tungsten disulfide (WS2) nanoflakes were synthesised and hybridised with carbon dots (CDs) using a facile two-step method of exfoliation of bulk tungsten disulphide followed by microwave irradiation of nanoflakes in a solution of citric acid. Physicochemical characterisation indicated that the hybrid consists of graphitic carbon dots with diameters of approximately 2-5 nm, attached to monolayer tungsten disulphide via electrostatic attraction forces. This synthesised hybrid material was investigated for photocatalytic applications. We found that within one hour approximately 30% more of the model organic dye was photodegraded by the hybrid material compared with the pristine 2D WS2. This enhancement was associated to the affinity of the CDs to the organic dye rather than heterojunctioning. Comparisons of the photocatalytic efficacy of this hybrid material with those of recently reported 2D transition metal dichalcogenides and their hybrids showed a significantly higher turnover frequency. Additionally, the presented microwave based synthesis method for developing hybrids of 2D WS2 and CDs, without making significant changes to the base 2D crystal structure and its surface chemistry, has not been demonstrated before. Altogether, the hybrid 2D material provides great potential for photocatalysis applications.
Subject Analytical Chemistry not elsewhere classified
Keyword(s) Carbon disulfide
Crystal structure
Heterojunctions
Hybrid materials
Microwave irradiation
Photocatalysis
Sulfur compounds
Surface chemistry
Transition metals
Tungsten 2d crystal structures
Electrostatic attractions
Photocatalytic activities
Photocatalytic application
Transition metal dichalcogenides
Tungsten disulfide
Tungsten disulphide
Two Dimensional (2 D)
DOI - identifier 10.1039/c6ta06415a
Copyright notice This journal is © The Royal Society of Chemistry 2016
ISSN 2050-7488
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