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Enhanced Raman Scattering of Rhodamine 6G Films on Two-Dimensional Transition Metal Dichalcogenides Correlated to Photoinduced Charge Transfer

Title
Enhanced Raman Scattering of Rhodamine 6G Films on Two-Dimensional Transition Metal Dichalcogenides Correlated to Photoinduced Charge Transfer
Authors
Lee, Y[Lee, Youngbin]Kim, H[Kim, Hyunmin]Lee, J[Lee, Jinhwan]Yu, SH[Yu, Seong Hun]Hwang, E[Hwang, Euyheon]Lee, C[Lee, Changgu]Ahn, JH[Ahn, Jong-Hyun]Cho, JH[Cho, Jeong Ho]
DGIST Authors
Kim, H[Kim, Hyunmin]
Issue Date
2016-01-12
Citation
Chemistry of Materials, 28(1), 180-187
Type
Article
Article Type
Article
Keywords
Adsorbed MoleculesCharge TransferElectric Field EnhancementElectric FieldsElectromagnetic Wave ScatteringEnergy-Band DiagramEnhanced Raman ScatteringGrapheneHybrid MaterialsHybrid SystemsMolybdenum CompoundsPhotoinduced Charge TransferRaman ScatteringSurface Enhanced Raman Scattering (SERS)Surface ScatteringTransition-Metals DichalcogenidesTransition-MetalssTwo-Dimensional (2-D)
ISSN
0897-4756
Abstract
We studied the surface-enhanced Raman scattering of an organic fluoropore (Rhodamine 6G, R6G) monolayer adsorbed onto graphene and two-dimensional (2D) molybedenium disulfides (MoS2) phototransistors and compared the results with the Raman scattering of R6G on 2D tungsten diselenides system (WSe2). The Raman enhancement factor of the R6G film adsorbed onto WSe2 was comparable to the corresponding value on graphene at 1365 cm-1 and was approximately twice this value at 615 cm-1. The amplitude of the charge transfer was estimated in situ by measuring the photocurrent produced in a hybrid system consisting of physisorbed R6G layer and the 2D materials. We found that the enhanced Raman scattering of R6G adsorbed onto the 2D materials was closely correlated with the charge transfer between the adsorbed molecules and the 2D materials. We also revealed that the intensity of Raman scattering generally decreased as the layer number of the 2D materials increased. For the R6G on the MoS2 nanosheet, a single layer system provided a maximum Raman enhancement factor, and this value decreased pseudolinearly with the number of layers. By contrast, the Raman enhancement factor of the R6G on WSe2 was greatest for both the mono- and bilayers, and it decreased dramatically as the number of layers increased. We provide qualitative theoretical explanations for these trends based on the electric field enhancement for the multile Fresnel phases and energy band diagrams of both systems. © 2015 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/2740
DOI
10.1021/acs.chemmater.5b03714
Publisher
American Chemical Society
Files:
There are no files associated with this item.
Collection:
Companion Diagnostics and Medical Technology Research Group1. Journal Articles


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