Raman scattering of light and IR absorption in carbon nanotubes

Bazhenov, A. V.; Kveder, V. V.; Максимов, А. А.; Tartakovskii, I. I.; Oganyan, R. A.; Ossipyan, Yu. A.; Shalynin, A. I.

doi:10.1134/1.558550

Cited by 9 publications

(4 citation statements)

References 19 publications

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“…For comparison, Raman spectra of graphite (Figure a) and HgO (Figure e) measured under the same conditions are also included in Figure . As reported by other researchers, − the spectra of raw CNTs (Figure b) and graphite (Figure a) are very similar with a strong Raman-allowed phonon peak at ∼1580 cm -1 ( G line) and a disorder-induced band at ∼1310 cm -1 ( D line). The relatively weak Raman responses at ∼2620 cm -1 in Figure a,b are believed to be attributed to the overtone of the first-order band at ∼1310 cm -1 …”

Section: Resultssupporting

confidence: 85%

Mercury(II) Immobilized on Carbon Nanotubes: Synthesis, Characterization, and Redox Properties

2000

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Mercury(II)-modified carbon nanotubes can be readily prepared by reacting purified/oxidized carbon nanotubes (CNTs) with a Hg(NO3)2 aqueous solution. Two types of surface-confined Hg(II) species are formed and have been identified as (CNT-COO)2HgII and (CNT-O)2HgII. These two complexes have a surface concentration ratio of about 30%:70%, on the basis of data obtained from high-resolution XPS spectra, Raman spectroscopy, and electrochemical measurements. The electrochemical behavior of Hg(II)-modified CNTs adhered to electrode surfaces in contact with CH3CN (electrolyte) strongly depends on the nature of the working electrode used and the size of electrolyte cation. Significant voltammetric changes also are observed after the addition of water to the initially water-free acetonitrile electrolyte solution. At a glassy carbon electrode and using NaClO4 as the electrolyte, a proposed mechanism is operative. However, at a gold-coated quartz-crystal electrode, Hg formed after reduction reacts with the Au to form Hg−Au alloy which has a very positive stripping peak potential value compared to that for the Hg film formed on glassy carbon surfaces. The influence of the electrolyte cation size on the reduction of Hg(II)-modified CNTs is attributed to the intercalation of electrolyte cations.

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Section: Resultssupporting

confidence: 85%

Mercury(II) Immobilized on Carbon Nanotubes: Synthesis, Characterization, and Redox Properties

2000

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“…This is corroborated by high-resolution TEM observations. Then, low-frequency Raman modes have already been observed [14][15][16] in MWNTs samples in particular in purified samples, although their origin has not been clearly identified. Recent calculations performed in our laboratory revealed that the van der Waals interactions between concentric tubes of different diameters could lead to lowfrequency breathing modes, the effect of the interactions being to upshift the Raman modes compared to those of individual tubes.…”

Section: Raman Spectramentioning

confidence: 99%

Raman spectroscopy and conductivity measurements on polymer-multiwalled carbon nanotubes composites

et al. 2002

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Thin films of poly(methyl methacrylate)–multiwalled nanotubes composites were produced by spin coating using different nanotube concentrations. The materials were characterized by scanning electron microscopy, energy-dispersive x-ray analysis, and Raman spectroscopy to obtain information on the possible interactions between the constituents and to control the homogeneity of the films. Electrical conductivity measurements of the composites, as a function of the nanotube concentration, show a percolation threshold at very low concentration. Also, the J–E characteristics exhibits a nonlinear behavior at low concentration, becoming linear far above the threshold.

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“…While single-walled carbon nanotubes ͑SWNTs͒ were discovered relatively recently, 1 their electronic [2][3][4][5] and mechanical [6][7][8][9][10] properties have made them targets of extensive study. Vibrational spectroscopy, and Raman spectroscopy in particular, has proved to be a useful tool in examining these structures, 9,[11][12][13][14][15][16][17][18][19][20] and theoretical work 2,7,8,[21][22][23][24][25][26][27] has produced models to explore the vibrations of the tubes for various structures as well as the interactions between the tubes. As an experimental probe of the tube interactions, Raman spectroscopy at high pressure is a particularly fruitful technique.…”

Section: Introductionmentioning

confidence: 99%

Structural phase transition in carbon nanotube bundles under pressure

et al. 2000

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The Raman shifts as functions of pressure were measured for the radial breathing mode and tangential modes in carbon nanoropes containing ͑10,10͒ and ͑17,0͒ single-walled tubes. An abrupt decrease in the rate of change of the Raman shift with pressure for the tangential modes, and the disappearance of the radial breathing mode, were observed at approximately 1.7 GPa. These changes in the Raman spectrum result from a structural phase transition as the nanoropes are compressed. Theoretical calculations using the empirical force method confirm this transition, as indicated by a calculated discontinuity in the lattice constants and unit cell volume at 1.7 GPa.

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Raman scattering of light and IR absorption in carbon nanotubes

Cited by 9 publications

References 19 publications

Mercury(II) Immobilized on Carbon Nanotubes: Synthesis, Characterization, and Redox Properties

Mercury(II) Immobilized on Carbon Nanotubes: Synthesis, Characterization, and Redox Properties

Raman spectroscopy and conductivity measurements on polymer-multiwalled carbon nanotubes composites

Structural phase transition in carbon nanotube bundles under pressure

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