Abstract
Nano-composites of two-dimensional atomic layered WS2 and Au nanoparticles (AuNPs) have been fabricated by sulfurization of sputtered W films followed by immersing into HAuCl4 aqueous solution. The morphology, structure and AuNPs distribution have been characterized by electron microscopy. The decorated AuNPs can be more densely formed on the edge and defective sites of triangle WS2. We have compared the optical absorption and photoluminescence of bare WS2 and Au-decorated WS2 layers. Enhancement in the photoluminescence is observed in the Au-WS2 nano-composites, attributed to localized surface plasmonic effect. This work provides the possibility to develop photonic application in two-dimensional materials.
Highlights
The unique properties of graphene with gapless at K and K′ points in brilliouin zone have been exploited in the last decades
Two-dimensional (2D) transition metal dichalcogenides (TMDCs) such as MoS2 and WS2 with different coulombic potentials of metal and sulfur atoms lead to the non-zero Semenoff mass so as to non-zero bandgap energies.[1]
Those enhanced excitonic emission after the decoration of Au nanoparticles (AuNPs) is the signature of the enhanced emission, which is amplified by the field enhancement arising from Localized surface plasmon resonance (LSPR) excitation
Summary
The unique properties of graphene with gapless at K and K′ points in brilliouin zone have been exploited in the last decades. Nano-composites of two-dimensional atomic layered WS2 and Au nanoparticles (AuNPs) have been fabricated by sulfurization of sputtered W films followed by immersing into HAuCl4 aqueous solution.
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