Direct measurement of the Raman enhancement factor of rhodamine 6G on graphene under resonant excitation
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12274_2014_Article_490.pdf
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Author(s)
Deng, Shibin
Xu, Weigao
Wang, Jinying
Wu, Juanxia
Xie, Liming
Zhang, Jin
Ling, Xi
Kong, Jing
Dresselhaus, Mildred
Date Issued
July 2014
Journal
Nano Research
Publisher
Tsinghua University Press
Citation
Deng, Shibin, Weigao Xu, Jinying Wang, Xi Ling, Juanxia Wu, Liming Xie, Jing Kong, Mildred S. Dresselhaus, and Jin Zhang. “Direct Measurement of the Raman Enhancement Factor of Rhodamine 6G on Graphene Under Resonant Excitation.” Nano Research 7, no. 9 (July 17, 2014): 1271–1279.
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Author's final manuscript
Abstract
Graphene substrates have recently been found to generate Raman enhancement. Systematic studies using different Raman probes have been implemented, but one of the most commonly used Raman probes, rhodamine 6G (R6G), has yielded controversial results for the enhancement effect on graphene. Indeed, the Raman enhancement factor of R6G induced by graphene has never been measured directly under resonant excitation because of the presence of intense fluorescence backgrounds. In this study, a polarization-difference technique is used to suppress the fluorescence background by subtracting two spectra collected using different excitation laser polarizations. As a result, enhancement factors are obtained ranging between 1.7 and 5.6 for the four Raman modes of R6G at 611, 1,183, 1,361, and 1,647 cm[superscript −1] under resonant excitation by a 514.5 nm laser. By comparing these results with the results obtained under non-resonant excitation (632.8 nm) and pre-resonant excitation (593 nm), the enhancement can be attributed to static chemical enhancement (CHEM) and tuning of the molecular resonance. Density functional theory simulations reveal that the orbital energies and densities for R6G are modified by graphene dots.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1007/s12274-014-0490-3
