2024-03-28T10:25:44Z
https://soar-ir.repo.nii.ac.jp/oai
oai:soar-ir.repo.nii.ac.jp:00016528
2022-12-14T04:02:11Z
1626:1627
Selective probe of the morphology and local vibrations at carbon nanoasperities
Fujimori, Toshihiko
Urita, Koki
Tomanek, David
Ohba, Tomonori
Moriguchi, Isamu
Endo, Morinobu
Kaneko, Katsumi
We introduce a way to selectively probe local vibration modes at nanostructured asperities such as tips of carbon nanohorns. Our observations benefit from signal amplification in surface-enhanced Raman scattering (SERS) at sites near a silver surface. We observe nanohorn tip vibration modes in the range 200-500 cm(-1), which are obscured in regular Raman spectra. Ab initio density functional calculations assign modes in this frequency range to local vibrations at the nanohorn cap resembling the radial breathing mode of fullerenes. Careful interpretation of our SERS spectra indicates presence of caps with 5 or 6 pentagons, which are chemically the most active sites. Changes in the peak intensities and frequencies with time indicate that exposure to laser irradiation may cause structural rearrangements at the cap.
Article
JOURNAL OF CHEMICAL PHYSICS. 136(6):064505 (2012)
journal article
AMER INST PHYSICS
2012-02-14
application/pdf
JOURNAL OF CHEMICAL PHYSICS
6
136
064505
0021-9606
AA00694991
https://soar-ir.repo.nii.ac.jp/record/16528/files/Selective_probe_morphology_local_vibrations_carbon.pdf
eng
22360193
https://pubmed.ncbi.nlm.nih.gov/22360193/
10.1063/1.3682771
https://doi.org/10.1063/1.3682771
Copyright© 2012 American Institute of Physics
This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in JOURNAL OF CHEMICAL PHYSICS. 136(6):064505 (2012) and may be found at https://doi.org/10.1063/1.3682771 .