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Ultraviolet Raman microscopy of single and multilayer graphene
We investigated Raman spectra of single-layer and multilayer graphene under ultraviolet laser excitation at the wavelength λ = 325 nm . It was found that while graphene's G peak remains pronounced in UV Raman spectra, the 2 D -band intensity undergoes severe quenching . The evolution of the r...
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| Published in: | Journal of applied physics 2009-08, Vol.106 (4), p.043509-043509-5 |
|---|---|
| Main Authors: | , , , , |
| Format: | Article |
| Language: | English |
| Citations: | Items that this one cites Items that cite this one |
| Online Access: | Get full text |
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| Summary: | We investigated Raman spectra of single-layer and multilayer graphene under ultraviolet laser excitation at the wavelength
λ
=
325
nm
. It was found that while graphene's
G
peak remains pronounced in UV Raman spectra, the
2
D
-band intensity undergoes severe
quenching
. The evolution of the ratio of the intensities of the
G
and
2
D
peaks,
I
(
G
)
/
I
(
2
D
)
, as the number of graphene layers
n
changes from
n
=
1
to
n
=
5
, is different in UV Raman spectra from that in conventional visible Raman spectra excited at the 488 and 633 nm wavelengths. The
2
D
band under UV excitation shifts to larger wave numbers and is found near
2825
cm
−
1
. The observed UV Raman features of graphene were explained by invoking the resonant scattering model. The obtained results contribute to the Raman nanometrology of graphene by providing an additional metric for determining the number of graphene layers and assessing its quality. |
|---|---|
| ISSN: | 0021-8979 1089-7550 |
| DOI: | 10.1063/1.3197065 |