Aufsatz in einer Fachzeitschrift
Monolayer-enriched production of Au-decorated WS2 Nanosheets via Defect Engineering
Details zur Publikation
Autor(inn)en: | Dunklin, J.; Lafargue, P.; Higgins, T.; Forcherio, G.; Benamara, M.; McEvoy, N.; Roper, D.; Coleman, J.; Vaynzof, Y.; Backes, C. |
Verlag: | CAMBRIDGE UNIV PRESS |
Publikationsjahr: | 2018 |
Zeitschrift: | MRS Advances |
Seitenbereich: | 2435-2440 |
Jahrgang/Band : | 3 |
Heftnummer: | 41 |
Erste Seite: | 2435 |
Letzte Seite: | 2440 |
Seitenumfang: | 6 |
ISSN: | 2059-8521 |
eISSN: | 2059-8521 |
DOI-Link der Erstveröffentlichung: |
Zusammenfassung, Abstract
Layered transition metal dichalcogenides (TMDs) represent a diverse, emerging source of two-dimensional (2D) nanostructures with broad application in optoelearonics 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-polyope. 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 Auo and are in turn oxidized to 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.
Layered transition metal dichalcogenides (TMDs) represent a diverse, emerging source of two-dimensional (2D) nanostructures with broad application in optoelearonics 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-polyope. 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 Auo and are in turn oxidized to 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.
