Raman spectra of neutron-irradiated pyrolytic graphite

Maeta, Hiroshi; Sato, Yoshiki

doi:10.1016/0038-1098(77)90621-4

Cited by 29 publications

(6 citation statements)

References 12 publications

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“…The G peak appears at a higher frequency with respect to the value measured in graphite (1580 cm -1 ); this has been observed previously in nanocrystalline graphite [6,7], and it is explained as an effect resulting from the loss of long-range transational symmetry on the phonon density of states, which causes the relaxation of the wavevector selection rule allowing higherfrequency phonons to contribute to the Raman spectrum [8,9]. The intensity of both peaks decreases with increasing annealing time, as carbon progressively out-diffuses from the sample.…”

Section: Visible Raman Spectroscopysupporting

confidence: 61%

Formation of carbon nanoclusters by implantation of keV carbon ions in fused silica followed by thermal annealing

et al. 2005

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In the last decade, the synthesis and characterization of nanometer sized carbon clusters have attracted growing interest within the scientific community. This is due to both scientific interest in the process of diamond nucleation and growth, and to the promising technological applications in nanoelectronics and quantum communications and computing. Our research group has demonstrated that MeV carbon ion implantation in fused silica followed by thermal annealing in the presence of hydrogen leads to the formation of nanocrystalline diamond, with cluster size ranging from 5 to 40 nm. In the present paper, we report the synthesis of carbon nanoclusters by the implantation into fused silica of keV carbon ions using the Plasma Immersion Ion Implantation (PIII) technique, followed by thermal annealing in forming gas (4% 2 H in Ar). The present study is aimed at evaluating this implantation technique that has the advantage of allowing high fluence-rates on large substrates. The carbon nanostructures have been characterized with optical absorption and Raman spectroscopies, cross sectional Transmission Electron Microscopy (TEM), and Parallel Electron Energy Loss Spectroscopy (PEELS). Nuclear Reaction Analysis (NRA) has been employed to evaluate the deuterium incorporation during the annealing process, as a key mechanism to stabilize the formation of the clusters.

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Section: Visible Raman Spectroscopysupporting

confidence: 61%

Formation of carbon nanoclusters by implantation of keV carbon ions in fused silica followed by thermal annealing

et al. 2005

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“…It has been reported that 2D-band further downshifts due to disorder or defects presence in carbon lattice [36]. The other band almost at similar position around 2922 cm −1 is related to the combination of G and D-band (G + D) in carbonaceous materials [37].…”

Section: Resultsmentioning

confidence: 91%

Growth of vertically aligned carbon nanotubes over self-ordered nano-porous alumina films and their surface properties

Rana

Kucukayan-Dogu

Bengu

2012

Applied Surface Science

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Nanoporous anodic aluminum oxide (AAO) with self-organized arrays of uniform nanopores have been used for various applications in the fields of sensing, storage, separation and template-based fabrication of metal nanowires, carbon nanotubes, oxides and polymers. The work presented here involves the production and use of AAO templates for growth of aligned multi walled carbon nanotube arrays. AAO templates were formed by electrochemical oxidation of aluminum in different electrolyte solutions containing sulfuric, oxalic and phosphoric acid. SEM was used for the analysis of the surface morphology of the AAO films. The porous structures with pore size in the range of 25-120 nm were observed. Pore sizes were correlated with the type of acidic solutions used as the electrolyte. Finally, AAO surfaces have been used as substrates for the growth of vertically aligned carbon nanotubes through chemical vapor deposition technique, which showed super-hydrophobic behavior as confirmed by contact angle measurements. © 2012 Elsevier B.V

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“…The Raman spectrum of small graphitic crystals (basal dimensions < 200 A) is different from that of a single crystal, as a new line appears in the spectrum of polycrystalline graphite at about 1355 cm-1 [32], called the D line or the disorder line. Changes also occur in the appearance of the G 38 line, which have been explained by a frequency shift [33] and by the appearance of a new line [34]. These new features are Raman inactive in the single crystal graphite.…”

Section: Raman Spectroscopymentioning

confidence: 96%

A study of the chemical, mechanical, and surface properties of thin films of hydrogenated amorphous carbon

Vandentop¹

1990

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Raman spectra of neutron-irradiated pyrolytic graphite

Cited by 29 publications

References 12 publications

Formation of carbon nanoclusters by implantation of keV carbon ions in fused silica followed by thermal annealing

Formation of carbon nanoclusters by implantation of keV carbon ions in fused silica followed by thermal annealing

Growth of vertically aligned carbon nanotubes over self-ordered nano-porous alumina films and their surface properties

A study of the chemical, mechanical, and surface properties of thin films of hydrogenated amorphous carbon

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