Probing the interaction of ionic liquids with graphene using surface-enhanced Raman spectroscopy

Mahurin, Shannon Mark; Dai, Sheng; Surwade, Sumedh P.; Crespo, Marcos

doi:10.1002/jrs.4858

Title: Probing the interaction of ionic liquids with graphene using surface-enhanced Raman spectroscopy

Journal Article · Thu Dec 17 00:00:00 EST 2015 · Journal of Raman Spectroscopy

DOI:https://doi.org/10.1002/jrs.4858· OSTI ID:1263877

Mahurin, Shannon Mark ^[1]; Dai, Sheng ^[1]; Surwade, Sumedh P. ^[2]; Crespo, Marcos ^[3]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Puerto Rico Piedras, San Juan (Puerto Rico)

We report an in situ measurement of the interaction of an imidazolium-based room temperature ionic liquid with both pure silver and a graphene-over-silver electrode under an applied electrochemical potential. At a negative applied potential, overall signal intensity increased indicating enhanced ionic liquid concentration at both silver and graphene electrodes. Vibrational modes associated with the imidazolium ring exhibited greater intensity enhancements and larger peak shifts compared with the anion indicating that the cation adsorbs with the ring and alkyl chain parallel to the electrode surface for both silver and graphene. In contrast to the silver, the surface enhanced Raman spectra of the ionic liquid near graphene showed shifts in the cation peaks even at no applied potential because of the strong π–π interaction between the ionic liquid and the graphene. Furthermore, the intensity of the graphene peak decreased in the presence of ionic liquid possibly due to the interaction between the ionic liquid and graphene. In conclusion, these results illustrate the effectiveness of surface-enhanced Raman spectroscopy to investigate electrolyte interactions with graphene at the liquid/electrode interface.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Energy Frontier Research Centers (EFRC) (United States). Fluid Interface Reactions, Structures and Transport Center (FIRST)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1263877

Journal Information:: Journal of Raman Spectroscopy, Vol. 47, Issue 5; ISSN 0377-0486

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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