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

Youngbin Lee, Hyunmin Kim, Jae Bok Lee, Jeong Ho Cho, Jong Hyun Ahn

Research output: Contribution to journalArticle

9 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)318-327
Number of pages10
JournalCarbon
Volume89
DOIs
Publication statusPublished - 2015 Aug 1

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Sandwich structures
Graphite
Graphene
Raman scattering
rhodamine 6G
Magnets

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

Cite this

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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.",
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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.

In: Carbon, Vol. 89, 01.08.2015, p. 318-327.

Research output: Contribution to journalArticle

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