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Surface Enhanced Raman Scattering of Alkyne Conjugated MoS2: A Comparative Study between Metallic and Semiconductor Phase

Abstract

Raman enhancement on nonmetallic flat two-dimensional (2D) nanomaterials surface has attracted great attention since the discovery of graphene enhanced Raman scattering. Beyond these unique nanomaterials, MoS2 is another flat 2D nanomaterial with unique electronic and physical properties. The existence of metallic phase in Li-MoS2 is about 70%, which is three folds higher than the portion of metallic phase in thioglycolic acid-MoS2, i.e. T-MoS2 (20%). As a result, 2-3 folds of Raman signal enhancement for R6G analyte is found for Li-MoS2. Furthermore, thiol terminated alkyne conjugated onto Li-MoS2 also shows greater SERS signal in 2123 cm-1 than does T-MoS2. Raman signal for thiol terminated alkyne conjugated onto Li-MoS2 is enhanced in a similar manner. Therefore, the defect rich metallic MoS2 monolayers can be used as perfect substrate for surface enhanced Raman scattering, though SERS effect of pristine MoS2 is hardly found. In this study, it is proved that the (1) defect rich metallic MoS2 (2) dipole-dipole interaction, (3) enhanced charge transfer effect of MoS2 monolayers are the three primary and essential parameters for the enhanced Raman signal of analytes on MoS2. It is important to note that some of alkyne groups directly coordinated to the edges of Li-MoS2 defective sites result in shifting alkyne signal to 2153 cm-1, in alkyne spectral mapping. More importantly, to quantify the SERS performances of Li-MoS2, SERS imaging of live cell is demonstrated using the unique alkyne signal at 2123cm-1.

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Publication details

The article was received on 14 Aug 2017, accepted on 29 Dec 2017 and first published on 29 Dec 2017


Article type: Paper
DOI: 10.1039/C7TC03682E
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Surface Enhanced Raman Scattering of Alkyne Conjugated MoS2: A Comparative Study between Metallic and Semiconductor Phase

    R. Anbazhagan, A. Vadivelmurugan, H. Tsai and R. Jeng, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC03682E

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