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Monolayer-enriched production of Au-decorated WS2 Nanosheets via Defect Engineering

Published online by Cambridge University Press:  06 April 2018

Jeremy R. Dunklin ,
Paul Lafargue ,
Thomas M. Higgins ,
Gregory T. Forcherio ,
Mourad Benamara ,
Niall McEvoy ,
D. Keith Roper ,
Jonathan N. Coleman ,
Yana Vaynzof  and
Claudia Backes
Jeremy R. Dunklin*
Affiliation:
National Renewable Energy Laboratory, Golden, CO, USA
Paul Lafargue
Affiliation:
Ruprecht-Karls University Heidelberg, Heidelberg, DE
Thomas M. Higgins
Affiliation:
Ruprecht-Karls University Heidelberg, Heidelberg, DE
Gregory T. Forcherio
Affiliation:
U.S. Army Research Laboratory, Adelphi, MD, USA
Mourad Benamara
Affiliation:
University of Arkansas, Fayetteville, AR, USA
Niall McEvoy
Affiliation:
Trinity College Dublin, Dublin 2, IE
D. Keith Roper
Affiliation:
University of Arkansas, Fayetteville, AR, USA
Jonathan N. Coleman
Affiliation:
Trinity College Dublin, Dublin 2, IE
Yana Vaynzof
Affiliation:
Ruprecht-Karls University Heidelberg, Heidelberg, DE
Claudia Backes
Affiliation:
Ruprecht-Karls University Heidelberg, Heidelberg, DE
*
*(Email: Jeremy.Dunklin@nrel.gov)
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Abstract

Layered transition metal dichalcogenides (TMDs) represent a diverse, emerging source of two-dimensional (2D) nanostructures with broad application in optoelectronics and energy. Chemical functionalization has evolved into a powerful tool to tailor properties of these 2D TMDs; however, functionalization strategies have been largely limited to the metallic 1T-polytype. The work herein illustrates that 2H-semiconducting liquid-exfoliated tungsten disulfide (WS2) undergoes a spontaneous redox reaction with gold (III) chloride (AuCl3). Au nanoparticles (NPs) predominantly nucleate at nanosheet edges with tuneable NP size and density. AuCl3 is preferentially reduced on multi-layer WS2 and resulting large Au aggregates are easily separated from the colloidal dispersion by simple centrifugation. This process may be exploited to enrich the dispersions in laterally large, monolayer nanosheets. It is proposed that thiol groups at edges and defects sides reduce the AuCl3 to Au0 and are in turn oxidized to disulfides. Optical emission, i.e. photoluminescence, of the monolayers remained pristine, while the electrocatalytic activity towards the hydrogen evolution reaction is significantly improved. Taken together, these improvements in functionalization, fabrication, and catalytic activity represent an important advance in the study of these emerging 2D nanostructures.

Keywords

self-assemblyfunctionalnanostructure
Type
Articles
Information
MRS Advances , Volume 3 , Issue 41: Nanomaterials , 2018 , pp. 2435 - 2440
Copyright
Copyright © Materials Research Society 2018 

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References

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