Observation of Raman g-peak split for graphene nanoribbons with hydrogen-terminated zigzag edges.
Nano Lett
; 11(10): 4083-8, 2011 Oct 12.
Article
em En
| MEDLINE
| ID: mdl-21899347
ABSTRACT
Raman scattering of individual hydrogen-terminated zigzag-edged graphene nanoribbons (Z-GNRs) was studied with focus on the G-peak. In addition to the bulk graphene G-peak appearing at â¼1594 cm(-1) (G(+)), an edge-related G-peak at â¼1583 cm(-1) (G(-)) was observed for Z-GNRs. This additional Raman vibrational mode originates from the zigzag edges where localized metallic edge states are present. The relative intensity ratio G(-)/G(+) displays a strong dependence on the ribbon width (W). It increases gradually with decreasing W, and the G(+) finally vanishes at W = 5(±3) nm. Polarized Raman scattering was also employed to confirm the four-fold symmetry of the split TO modes, and the results are in good agreement with previous theoretical predictions. Our work offers the first direct experimental evidence to confirm the validity of predicted Raman scattering of GNRs.
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01-internacional
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MEDLINE
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En
Ano de publicação:
2011
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Article