Dataset Information

Light-Induced Surface Potential Modification in MoS₂ Monolayers on Au Nanostripe Arrays.

ABSTRACT: In this work, the surface potential (V_S) of exfoliated MoS₂ monolayers on Au nanostripe arrays with period of 500?nm was investigated using Kelvin probe force microscopy. The surface morphology showed that the suspended MoS₂ region between neighboring Au stripes underwent tensile-strain. In the dark, the V_S of the MoS₂ region on the Au stripe (V_S-Au) was larger than that of the suspended MoS₂ region (V_S-S). However, under green light illumination, V_S-Au became smaller than V_S-S. To explain the V_S modification, band diagrams have been constructed taking into consideration not only the local strain but also the electronic interaction at the MoS₂/Au interface. The results of this work provide a basis for understanding the electrical properties of MoS₂-metal contacts and improving the performance of MoS₂-based optoelectronic devices.

SUBMITTER: Kwon S

PROVIDER: S-EPMC6783531 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature

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Publications

Light-Induced Surface Potential Modification in MoS2 Monolayers on Au Nanostripe Arrays.

Kwon Soyeong S Kwon Min Hee MH Song Jungeun J Kim Eunah E Kim Youngji Y Kim Bo Ra BR Hyun Jerome K JK Lee Sang Wook SW Kim Dong-Wook DW

Scientific reports 20191008 1

In this work, the surface potential (VS) of exfoliated MoS2 monolayers on Au nanostripe arrays with period of 500 nm was investigated using Kelvin probe force microscopy. The surface morphology showed that the suspended MoS2 region between neighboring Au stripes underwent tensile-strain. In the dark, the VS of the MoS2 region on the Au stripe (VS-Au) was larger than that of the suspended MoS2 region (VS-S). H ...[more]

PMID: 31594976

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Project description:In this work we investigated methods of modifying gold nanospheres bound to a silicon surface by depositing palladium onto the surfaces of single nanoparticles. Bimetallic Au-Pd nanoparticles can thus be gained for use in catalysis or sensor technology. For Pd deposition, two methods were chosen. The first method was the reduction of palladium acetate by ascorbic acid, in which the amounts of palladium acetate and ascorbic acid were varied. In the second method we utilized light-induced metal deposition by making use of the plasmonic effect. Through this method, the surface bond nanoparticles were irradiated with light of wavelengths capable of inducing plasmon resonance. The generation of hot electrons on the particle surface then reduced the palladium acetate in the vicinity of the gold nanoparticle, resulting in palladium-covered gold nanospheres. In our studies we demonstrated the effect of both enhancement methods by monitoring the particle heights over enhancement time by atomic force microscopy (AFM), and investigated the influence of ascorbic acid/Pd acetate concentration as well as the impact of the irradiated wavelengths on the enhancement effect. It could thus be proven that both methods were valid for obtaining a deposition of Pd on the surface of the gold nanoparticles. Deposition of Pd on the gold particles using the light-assisted method could be observed, indicating the impact of the plasmonic effect and hot electron for Pd acetate reduction on the gold particle surface. In the case of the reduction method with ascorbic acid, in addition to Pd deposition on the gold nanoparticle surface, larger pure Pd particles and extended clusters were also generated. The reduction with ascorbic acid however led to a considerably thicker Pd layer of up to 54 nm in comparison to up to 11 nm for the light-induced metal deposition with light resonant to the particle absorption wavelength. Likewise, it could be demonstrated that light of non-resonant wavelengths was not capable of initiating Pd deposition, since a growth of only 1.6 nm (maximum) was observed for the Pd layer.

Dataset Information

Light-Induced Surface Potential Modification in MoS₂ Monolayers on Au Nanostripe Arrays.

Publications

Light-Induced Surface Potential Modification in MoS<sub>2</sub> Monolayers on Au Nanostripe Arrays.

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