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Pressure-induced chemical enhancement in Raman scattering from graphene-Rhodamine 6G-graphene sandwich structures
- Pressure-induced chemical enhancement in Raman scattering from graphene-Rhodamine 6G-graphene sandwich structures
- Lee, Youngbin; Kim, Hyunmin; Lee, Jae-Bok; Cho, Jeong Ho; Ahn, Jong-Hyun
- DGIST Authors
- Kim, Hyunmin
- Issue Date
- Carbon, 89, 318-327
- Article Type
- Chemical Enhancements; Enhancement Effects; Graphene; Increase in Pressure; Multi-Layered Graphene; Pressure-Induced Enhancement; Raman Scattering; Raman Spectroscopy; Sandwich Structures; Sandwiched Structure; Scattering Signals; Vibrational Motions
- 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.
- Elsevier Ltd
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