Journal ArticleDOI
High-pressure Raman response of single-walled carbon nanotubes: Effect of the excitation laser energy
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In this paper, high-pressure Raman experiments on the tangential vibrational modes of CarboLex bundled single-walled carbon nanotubes up to 6.5 GPa using two different excitation energies: 1.96 and 2.41 eV.Abstract:
We report high-pressure Raman experiments on the tangential vibrational modes of CarboLex bundled single-walled carbon nanotubes up to 6.5 GPa using two different excitation energies: 1.96 and 2.41 eV. We show through the curve-fitting technique, together with the modified interband transition energies versus diameter plot, how the nature of the resonant tubes is modified under the excitation energy, in particular under the 1.96 eV excitation. Having metallic and semiconducting tubes in resonance at ambient pressure, we find that only semiconducting tubes are in resonance at 3.5 GPa. We associate this loss of resonance from the metallic tubes to a redshift pressure response of the first E11 transition energies from these tubes. Added to that, the change in the excitation energies leads to a change in the value of the transition pressure. This is simply associated with the fact of having different diameters in resonance under each excitation from the same sample.read more
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Journal ArticleDOI
Raman Studies of Carbon Nanostructures
Ado Jorio,Antonio G. Souza Filho +1 more
TL;DR: In this paper, a review of recent advances on the use of Raman spectroscopy to study and characterize carbon nanostructures is presented, including Stokes-anti-Stokes correlation, tip-enhanced Raman Spectroscopy in two dimensions, phonon coherence, and high-pressure and shielding effects.
Journal ArticleDOI
Carbon under pressure
TL;DR: In this article, physical properties and structural transformations observed in high pressure experiments, at and above room temperature, are reviewed for a large number of solid carbon allotropes including bulk carbon such as graphite, diamond, glass-like and amorphous carbon, two-dimensional graphene, and molecular carbon in the form of one-dimensional carbon nanotubes and zero-dimensional fullerenes.
Journal ArticleDOI
Effects of pressure on the structural and electronic properties of linear carbon chains encapsulated in double wall carbon nanotubes
W.Q. Neves,Rafael S. Alencar,R.S. Ferreira,A.C. Torres-Dias,N. F. Andrade,Alfonso San-Miguel,Yoong Ahm Kim,Morinobu Endo,Doo Won Kim,Hisakazu Muramatsu,A. L. Aguiar,A. G. Souza Filho +11 more
TL;DR: In this article, high-pressure resonance Raman experiments were performed on linear carbon chains Cn confined in double-wall carbon nanotubes (Cn@DWCNT).
Journal ArticleDOI
Linear Carbon Chains under High-Pressure Conditions
N. F. Andrade,A. L. Aguiar,Yoong Ahm Kim,Morinobu Endo,Paulo Freire,Gustavo Brunetto,Douglas S. Galvao,M. S. Dresselhaus,A. G. Souza Filho +8 more
TL;DR: In this article, a high-pressure resonance Raman spectroscopy study of linear carbon chains encapsulated inside multiwalled carbon nanotubes (MWCNTs) is reported.
Journal ArticleDOI
Density-functional tight-binding study of the collapse of carbon nanotubes under hydrostatic pressure
TL;DR: In this article, the authors investigated the radial collapse of carbon nanotubes bundles using the density-functional based tight-binding method for a large number of chiralities in the small diameter range.