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SERS effect of selective adsorbed dyes by hydrothermal produced MoS2 nano sheets

Abstract

Electro-magnetic mechanism and chemical transfer mechanism coexist in the surface enhanced Raman scattering (SERS) procedure. However the latter is regretfully neglected due to the poor chemical transfer efficiency without the aid of direct chemical bond. In this very paper, to explore the CM Raman enhancement essence and understand the mechanism of SERS, the Raman testing and adsorption experiment have been carried out with the exploration and application of metal-free SERS substrate. So, a functional organic group modified MoS2 nano sheets have been prepared by hydrothermal method; and this as-prepared MoS2 shows an apparent Raman signal enhancement effect when it is served as the Raman substrate. Compared with the one without organic group (purchased MoS2) and the one organic group removing (annealed MoS2), it is found that with the as-prepared functional MoS2 nano sheets the minimum detection concentration of Rhodamine B (RhB) could be 0.1 ppm, while the detection limit of annealed as-prepared MoS2 nano sheets and commercially purchased MoS2 powders were only 1 ppm and 10 ppm, respectively. Fourier transition infrared spectroscopy has revealed that the surface of as-prepared MoS2 nano sheets was passivized by –NH2 and C=C and C=O groups. The lone pair electrons in –NH2 and the p-bond electrons in C=C and C=O groups would coordinate the nitrogen ethyl of RhB, forming a direct chemical bond, which could contribute much to the charge transfer, leading to an efficient adsorption to the RhB molecule and this is the key to achieve the SERS effect with the prepared MoS2 nano sheets substrate.

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Publication details

The article was received on 31 Jul 2018, accepted on 10 Oct 2018 and first published on 10 Oct 2018


Article type: Paper
DOI: 10.1039/C8NJ03837F
Citation: New J. Chem., 2018, Accepted Manuscript
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    SERS effect of selective adsorbed dyes by hydrothermal produced MoS2 nano sheets

    G. Zheng, P. Zhang, S. Zhang, Y. PENG, L. Zhang, L. Huang, Y. JIN, Z. Jiao and X. Sun, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ03837F

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