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Building a lateral/vertical 1T-2H MoS2/Au heterostructure for enhanced photoelectrocatalysis and surface enhanced Raman scattering

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Abstract

Two-dimensional transition metal dichalcogenide (TMD) based heterostructures are attractive candidates for optoelectronic nanodevice applications. Here, both photoelectrocatalytic (PEC) water splitting and surface-enhanced Raman scattering (SERS) performances are largely improved for a lateral/vertical 1T-2H MoS2/Au heterostructure. Combined experimental and performance studies unambiguously reveal that the efficient PEC performance of the 1T-2H MoS2/Au heterostructure mainly originates from the formation of a lateral/vertical heterojunction for efficient light utilization and fast charge transfer. Meanwhile, such a heterostructure exhibits excellent SERS detection sensitivity towards rhodamine 6G (R6G), with a detection limit as low as 10−10 M and an enhancement factor (EF) of 8.1 × 106, owing to the coupling effect of the electromagnetic effect from plasmonic Au nanoparticles and the efficient charge transfer process between the heterostructure and the detected molecules. This study not only reveals the origin of the PEC and SERS performance enhancements based on the lateral/vertical 1T-2H MoS2/Au heterostructure, but also paves the way for designing multifunctional optoelectronic nanodevices.

Graphical abstract: Building a lateral/vertical 1T-2H MoS2/Au heterostructure for enhanced photoelectrocatalysis and surface enhanced Raman scattering

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Publication details

The article was received on 07 Jun 2019, accepted on 02 Aug 2019 and first published on 02 Aug 2019


Article type: Paper
DOI: 10.1039/C9TA06091J
J. Mater. Chem. A, 2019, Advance Article

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    Building a lateral/vertical 1T-2H MoS2/Au heterostructure for enhanced photoelectrocatalysis and surface enhanced Raman scattering

    X. Zheng, Z. Guo, G. Zhang, H. Li, J. Zhang and Q. Xu, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA06091J

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