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Pressure-induced chemical enhancement in Raman scattering from graphene-Rhodamine 6G-graphene sandwich structures

Title
Pressure-induced chemical enhancement in Raman scattering from graphene-Rhodamine 6G-graphene sandwich structures
Authors
Lee, Y[Lee, Youngbin]Kim, H[Kim, Hyunmin]Lee, JB[Lee, Jae-Bok]Cho, JH[Cho, Jeong Ho]Ahn, JH[Ahn, Jong-Hyun]
DGIST Authors
Kim, H[Kim, Hyunmin]
Issue Date
2015-08
Citation
Carbon, 89, 318-327
Type
Article
Article Type
Article
Keywords
Chemical EnhancementsEnhancement EffectsGrapheneIncrease in PressureMulti-Layered GraphenePressure-Induced EnhancementRaman ScatteringRaman SpectroscopySandwich StructuresSandwiched StructureScattering SignalsVibrational Motions
ISSN
0008-6223
Abstract
In this study, we introduce a new method to enhance the Raman signals of a graphene-Rhodamine 6G (R6G)-graphene sandwich structure by creating a magnet-induced static pressure to maximize the chemical contact between the R6G molecules and graphene. The increase in pressure in the graphene-R6G-graphene sandwich geometry plays a crucial role in enhancing the Raman signal by approximately up to 30 times in comparison to that acquired from a R6G/graphene layered film. In addition, the pressure-induced enhancement effects in the planar vibrational motion of the R6G (1200-1500 cm-1) were more recognizable than those in the low-wavenumber region and were almost comparable to the surface-induced enhancement effects in the Raman scattering signals observed from the spontaneously formed 'folded' pseudo-π-bonded graphene-R6G-graphene sandwich structures. The enhancement effect diminished with an increase in the number of graphene layers (on the bottom side), which was clearly discernible when graphene/glass sandwiched structures placed on top of exfoliated multilayered graphene coated with R6G were imaged. © 2015 Elsevier Ltd. All rights reserved.
URI
http://hdl.handle.net/20.500.11750/2872
DOI
10.1016/j.carbon.2015.03.065
Publisher
Elsevier Ltd
Related Researcher
Files:
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Collection:
Companion Diagnostics and Medical Technology Research Group1. Journal Articles


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