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Doublet of D and 2D bands in graphene deposited with Ag nanoparticles by surface enhanced Raman spectroscopy
Affiliation:1. The Beijing Key Laboratory for Nano-Photonics and Nano-Structure, Department of Physics, Capital Normal University, Beijing 100048, China;2. Institute of Electrochemistry, Clausthal University of Technology, Arnold-Sommerfeld-Str. 6, 38678 Clausthal-Zellerfeld, Germany;1. CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, PR China;2. CAS Key Laboratory of Materials for Energy Conversions, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, PR China;1. Universidad Autónoma de Nuevo León, UANL, Chemistry School of Sciences, Av. Universidad s/n, Ciudad Universitaria, San Nicolás de los Garza, Nuevo León 66451, Mexico;2. Universitat de València, Institut de Ciència Molecular, Edificio de Estudios de Paterna, Polígono la Coma s/n, 46980 Paterna, Spain;1. Institute of Electronic Structure and Laser, FORTH, P.O. Box 1527, 71110 Heraklio, Crete, Greece;2. Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506, United States
Abstract:Surface enhanced Raman spectrum of graphene was obtained by modifying graphene with Ag nano-particles. The doublet of D band and 2D band was observed due to surface enhanced Raman scattering (SERS) enhancement and relaxation of the selection rules originated from the interaction of Ag nano-particles and graphene. The difference in the doublet of D band in which the separation between the two peaks is 11 cm?1 is close to the theoretical value of 9 cm?1 and can be attributed to the disorder and edge effect. The doublet of 2D band can be assigned to the asymmetry of dispersion relation along KM and KГ respectively. The phonon mode at 1510 cm?1 can be associated with the iTO phonon near ГK/4. This confirms the phonon dispersion based on double resonance (DR) theory in iTO branch.
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