Chirality Assignment for Metallic Species via Coherent Phonon Oscillations in Arc-Discharge Single-Walled Carbon Nanotubes
- Chirality Assignment for Metallic Species via Coherent Phonon Oscillations in Arc-Discharge Single-Walled Carbon Nanotubes
- Seong-Il Shin; Yong-Sik Lim; 김명종
- Carbon Nanotubes; Coherent Phonon; phonon oscillations; Arc-discharge single-walled carbon nanotubes; Chirality assignment; Spectral-resolved spectroscopy
- Issue Date
- Journal of the Korean Physical Society
- VOL 67, NO 5, 921-929
- We performed transient absorption measurements with sub-10-fs pulses to observe coherent
phonon (CP) oscillations of species in a micelle-suspended arc-discharge single-walled carbon nanotube (SWNT) ensemble. We applied a spectral-resolved measurement scheme to investigate the photon-wavelength dependence of CP oscillations of the radial breathing mode (RBM) specific to each species, covering a broad photon wavelength range from 700 to 1000 nm (1.771 − 1.240 eV). With a linear prediction singular value decomposition (LPSVD) method as a robust alternative for resolving closely-overlapped vibration modes, we divided multiple RBM peaks into two components, the M11-excited metallic species and the S22-excited semiconducting species, respectively. We resolved the RBM peaks into 22 metallic and 29 semiconducting species. Resolved metallic tubes showed a wide distribution in diameters from 1.3 to 2.3 nm, forming a chirality distribution from (2n + m) = 33 family to 51 family.
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