Organic Solvent Based Synthesis of Gold Nanoparticle - Semiconducting 2H-MoS2 Hybrid Nanosheets

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The development of simple, versatile strategies for the synthesis of gold nanoparticles (AuNPs) on semiconducting transition-metal dichalcogenide (TMDC) layers is of increasing scientific and technological interest in photocatalysis, optical sensing, and optoelectronics sectors, but challenges exist on the nucleation and hybridization of AuNPs with the TMDC basal plane. At present, the widely used aqueous solution approaches suffer from poor dispersion of produced hybrids as well as from limited growth and coverage of the AuNPs on the TMDC semiconducting plane since Au nanoclusters nucleate preferentially at the electron-rich defect edges, which act as reducing agents and not on the defect-free basal plane. Here, we report for the first time the controlled synthesis of AuNPs on the basal plane of semiconducting molybdenum disulfide nanosheets (2H-MoS 2 NSs) via an N,N-dimethylformamide (DMF)-based hot-injection synthesis route. This organic solvent-based synthesis route eliminates problems of poor dispersion of AuNPs@2H-MoS 2 NS hybrids and at the same time maintains the semiconducting crystalline quality of the pristine 2H-MoS 2 NSs. In addition, the study establishes the important role of trisodium citrate in enhancing the nucleation and improving the hybridization of AuNPs on 2H-MoS 2 NSs as evidenced by the induced p-type doping. This organic solvent synthesis approach can be adopted for other hybrid systems opening the way for controlled hybridization of semiconducting layers with metal nanoparticles.

LanguageEnglish
Pages10646-10657
Number of pages12
JournalThe Journal of Physical Chemistry C
Volume123
Issue number16
Early online date28 Mar 2019
DOIs
Publication statusPublished - 25 Apr 2019

Fingerprint

Nanosheets
Gold
Organic solvents
gold
Nanoparticles
nanoparticles
Transition metals
synthesis
transition metals
Nucleation
routes
nucleation
molybdenum disulfides
Dimethylformamide
Defects
Photocatalysis
Metal nanoparticles
Nanoclusters
Reducing Agents
defects

Keywords

  • 2D Materials
  • MoS2/Au hybrids
  • MoS2 nanosheets
  • Dichalcogenides
  • hydrogen evolution reaction
  • semiconducting MoS2 nanosheets
  • Gold nanoparticles
  • MoS2-gold hybrids
  • doping
  • ionic liquid assisted grinding exfoliation
  • solution nanoparticle synthesis

Cite this

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title = "Organic Solvent Based Synthesis of Gold Nanoparticle - Semiconducting 2H-MoS2 Hybrid Nanosheets",
abstract = "The development of simple, versatile strategies for the synthesis of gold nanoparticles (AuNPs) on semiconducting transition-metal dichalcogenide (TMDC) layers is of increasing scientific and technological interest in photocatalysis, optical sensing, and optoelectronics sectors, but challenges exist on the nucleation and hybridization of AuNPs with the TMDC basal plane. At present, the widely used aqueous solution approaches suffer from poor dispersion of produced hybrids as well as from limited growth and coverage of the AuNPs on the TMDC semiconducting plane since Au nanoclusters nucleate preferentially at the electron-rich defect edges, which act as reducing agents and not on the defect-free basal plane. Here, we report for the first time the controlled synthesis of AuNPs on the basal plane of semiconducting molybdenum disulfide nanosheets (2H-MoS 2 NSs) via an N,N-dimethylformamide (DMF)-based hot-injection synthesis route. This organic solvent-based synthesis route eliminates problems of poor dispersion of AuNPs@2H-MoS 2 NS hybrids and at the same time maintains the semiconducting crystalline quality of the pristine 2H-MoS 2 NSs. In addition, the study establishes the important role of trisodium citrate in enhancing the nucleation and improving the hybridization of AuNPs on 2H-MoS 2 NSs as evidenced by the induced p-type doping. This organic solvent synthesis approach can be adopted for other hybrid systems opening the way for controlled hybridization of semiconducting layers with metal nanoparticles.",
keywords = "2D Materials, MoS2/Au hybrids, MoS2 nanosheets, Dichalcogenides, hydrogen evolution reaction, semiconducting MoS2 nanosheets, Gold nanoparticles, MoS2-gold hybrids, doping, ionic liquid assisted grinding exfoliation, solution nanoparticle synthesis",
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Organic Solvent Based Synthesis of Gold Nanoparticle - Semiconducting 2H-MoS2 Hybrid Nanosheets. / Ganguly, Abhijit; Trovato, Olga ; Duraisamy, Shanmugha Sundaram; Han, Yisong; University of Catania ; Papakonstantinou, P.

In: The Journal of Physical Chemistry C, Vol. 123, No. 16, 25.04.2019, p. 10646-10657.

Research output: Contribution to journalArticle

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N2 - The development of simple, versatile strategies for the synthesis of gold nanoparticles (AuNPs) on semiconducting transition-metal dichalcogenide (TMDC) layers is of increasing scientific and technological interest in photocatalysis, optical sensing, and optoelectronics sectors, but challenges exist on the nucleation and hybridization of AuNPs with the TMDC basal plane. At present, the widely used aqueous solution approaches suffer from poor dispersion of produced hybrids as well as from limited growth and coverage of the AuNPs on the TMDC semiconducting plane since Au nanoclusters nucleate preferentially at the electron-rich defect edges, which act as reducing agents and not on the defect-free basal plane. Here, we report for the first time the controlled synthesis of AuNPs on the basal plane of semiconducting molybdenum disulfide nanosheets (2H-MoS 2 NSs) via an N,N-dimethylformamide (DMF)-based hot-injection synthesis route. This organic solvent-based synthesis route eliminates problems of poor dispersion of AuNPs@2H-MoS 2 NS hybrids and at the same time maintains the semiconducting crystalline quality of the pristine 2H-MoS 2 NSs. In addition, the study establishes the important role of trisodium citrate in enhancing the nucleation and improving the hybridization of AuNPs on 2H-MoS 2 NSs as evidenced by the induced p-type doping. This organic solvent synthesis approach can be adopted for other hybrid systems opening the way for controlled hybridization of semiconducting layers with metal nanoparticles.

AB - The development of simple, versatile strategies for the synthesis of gold nanoparticles (AuNPs) on semiconducting transition-metal dichalcogenide (TMDC) layers is of increasing scientific and technological interest in photocatalysis, optical sensing, and optoelectronics sectors, but challenges exist on the nucleation and hybridization of AuNPs with the TMDC basal plane. At present, the widely used aqueous solution approaches suffer from poor dispersion of produced hybrids as well as from limited growth and coverage of the AuNPs on the TMDC semiconducting plane since Au nanoclusters nucleate preferentially at the electron-rich defect edges, which act as reducing agents and not on the defect-free basal plane. Here, we report for the first time the controlled synthesis of AuNPs on the basal plane of semiconducting molybdenum disulfide nanosheets (2H-MoS 2 NSs) via an N,N-dimethylformamide (DMF)-based hot-injection synthesis route. This organic solvent-based synthesis route eliminates problems of poor dispersion of AuNPs@2H-MoS 2 NS hybrids and at the same time maintains the semiconducting crystalline quality of the pristine 2H-MoS 2 NSs. In addition, the study establishes the important role of trisodium citrate in enhancing the nucleation and improving the hybridization of AuNPs on 2H-MoS 2 NSs as evidenced by the induced p-type doping. This organic solvent synthesis approach can be adopted for other hybrid systems opening the way for controlled hybridization of semiconducting layers with metal nanoparticles.

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KW - MoS2-gold hybrids

KW - doping

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