Issue 34, 2019

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

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

Supplementary files

Article information

Article type
Paper
Submitted
07 Jun 2019
Accepted
02 Aug 2019
First published
02 Aug 2019

J. Mater. Chem. A, 2019,7, 19922-19928

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, 7, 19922 DOI: 10.1039/C9TA06091J

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