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

Abstract

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.

Authors:
 [1];  [1];  [2];  [3]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Univ. of Puerto Rico Piedras, San Juan (Puerto Rico)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1263877
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Raman Spectroscopy
Additional Journal Information:
Journal Volume: 47; Journal Issue: 5; Journal ID: ISSN 0377-0486
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Mahurin, Shannon Mark, Dai, Sheng, Surwade, Sumedh P., and Crespo, Marcos. Probing the interaction of ionic liquids with graphene using surface-enhanced Raman spectroscopy. United States: N. p., 2015. Web. doi:10.1002/jrs.4858.
Mahurin, Shannon Mark, Dai, Sheng, Surwade, Sumedh P., & Crespo, Marcos. Probing the interaction of ionic liquids with graphene using surface-enhanced Raman spectroscopy. United States. doi:10.1002/jrs.4858.
Mahurin, Shannon Mark, Dai, Sheng, Surwade, Sumedh P., and Crespo, Marcos. Thu . "Probing the interaction of ionic liquids with graphene using surface-enhanced Raman spectroscopy". United States. doi:10.1002/jrs.4858. https://www.osti.gov/servlets/purl/1263877.
@article{osti_1263877,
title = {Probing the interaction of ionic liquids with graphene using surface-enhanced Raman spectroscopy},
author = {Mahurin, Shannon Mark and Dai, Sheng and Surwade, Sumedh P. and Crespo, Marcos},
abstractNote = {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.},
doi = {10.1002/jrs.4858},
journal = {Journal of Raman Spectroscopy},
issn = {0377-0486},
number = 5,
volume = 47,
place = {United States},
year = {2015},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 3 works
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