Issue 46, 2018

A novel sensitive and stable surface enhanced Raman scattering substrate based on a MoS2 quantum dot/reduced graphene oxide hybrid system

Abstract

A MoS2 quantum dot/reduced graphene oxide (MoS2 QD/rGO) nanocomposite has been synthesized by a simple hydrothermal approach. For the first time, the MoS2 QD/rGO composite is used as a highly sensitive and stable surface enhanced Raman scattering (SERS) substrate to detect trace amounts of molecular species. The lowest detection limit (LOD) for rhodamine 6G (R6G) is as low as 1 × 10−9 M with the maximum enhancement factor (EF) of up to 1.20 × 107, which is the best among the non-noble metal SERS materials. For practical applications, the MoS2 QD/rGO SERS substrate is also used to detect methylene blue (MB) in deionized water and river water. The LOD (1 × 10−8 M) is obtained in river water, which demonstrates the high feasibility for multi-molecule detection and vast potential ability for the detection of chemical and biological molecules. The enhancement mechanism of the MoS2 QD/rGO SERS substrate is studied, and the large enhancement of the SERS signal is due to the charge transfer (CT) state formed at the interface of the 1T-phase MoS2 QDs with small size and ultrathin slices and organic molecules. The chemical enhancement of rGO also contributes to the SERS enhancement. The study paves a new way for designing a novel MoS2 QD-based SERS substrate.

Graphical abstract: A novel sensitive and stable surface enhanced Raman scattering substrate based on a MoS2 quantum dot/reduced graphene oxide hybrid system

Supplementary files

Article information

Article type
Paper
Submitted
12 Oct 2018
Accepted
19 Oct 2018
First published
20 Oct 2018

J. Mater. Chem. C, 2018,6, 12547-12554

A novel sensitive and stable surface enhanced Raman scattering substrate based on a MoS2 quantum dot/reduced graphene oxide hybrid system

D. Wu, J. Chen, Y. Ruan, K. Sun, K. Zhang, W. Xie, F. Xie, X. Zhao and X. Wang, J. Mater. Chem. C, 2018, 6, 12547 DOI: 10.1039/C8TC05151H

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