Premium
Theory of the evolution of 2 D band in the Raman spectra of monolayer and bilayer graphene with laser excitation energy
Author(s) -
Wang Hui,
You Jinghan,
Wang Lin,
Feng Min,
Wang Yufang
Publication year - 2010
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.2435
Subject(s) - raman spectroscopy , excitation , graphene , bilayer graphene , wavenumber , monolayer , resonance (particle physics) , dispersion (optics) , laser , spectral line , bilayer , molecular physics , d band , chemistry , atomic physics , materials science , optics , physics , nanotechnology , biochemistry , quantum mechanics , astronomy , membrane
A double‐resonance process gives rise to the 2 D band in the Raman spectra of monolayer and bilayer graphene. Based on the electronic and vibrational dispersion energies of graphene, the wavenumbers of the 2 D band were calculated under different laser excitation energies (from 1.0 to 4.4 eV). Calculated results are in good agreement with experimental data and reproduce the experimental dispersion slope of the 2 D band very well. The calculated wavenumbers of the 2 D band do not show a linear dependence on the laser excitation energies. Moreover, it is explained that the lowest wavenumber peak of the 2 D band of the bilayer graphene, which is composed of four components, has the largest slope with laser excitation energy. Copyright © 2009 John Wiley & Sons, Ltd.