期刊
NANOMATERIALS
卷 12, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/nano12091567
关键词
MoS2; surface plasmon; photoluminescence; electron transfer; surface photovoltage
类别
资金
- National Research Foundation [2022R1A4A2000835, 2022R1A2B5B01002353, 2018K1A4A3A01064272, 2018R1A6A1A03025340, 2021R1A6A1A10039823]
- National Research Foundation of Korea [2022R1A4A2000835, 2022R1A2B5B01002353, 2021R1A6A1A10039823] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Hybrid nanostructures of MoS2 monolayers and Au nanopillar arrays were fabricated. The MoS2 flakes transferred onto the Au-NPs were observed to be flat and nonstrained. The Raman and photoluminescence intensities of MoS2/Au-NP were significantly higher than those of MoS2 flakes on a flat Au thin film. Finite-difference time-domain calculations showed that the Au-NPs enhanced the absorption in the MoS2 flakes and enabled efficient collection of photogenerated electrons.
We fabricated hybrid nanostructures consisting of MoS2 monolayers and Au nanopillar (Au-NP) arrays. The surface morphology and Raman spectra showed that the MoS2 flakes transferred onto the Au-NPs were very flat and nonstrained. The Raman and photoluminescence intensities of MoS2/Au-NP were 3- and 20-fold larger than those of MoS2 flakes on a flat Au thin film, respectively. The finite-difference time-domain calculations showed that the Au-NPs significantly concentrated the incident light near their surfaces, leading to broadband absorption enhancement in the MoS2 flakes. Compared with a flat Au thin film, the Au-NPs enabled a 6-fold increase in the absorption in the MoS2 monolayer at a wavelength of 615 nm. The contact potential difference mapping showed that the electric potential at the MoS2/Au contact region was higher than that of the suspended MoS2 region by 85 mV. Such potential modulation enabled the Au-NPs to efficiently collect photogenerated electrons from the MoS2 flakes, as revealed by the uniform positive surface photovoltage signals throughout the MoS2 surface.
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