Raman scattering from ion-implanted diamond, graphite, and polymers

Lee, E. H.; Hembree, D. M.; Rao, Gopal R.; Mansur, L.K.

doi:10.1103/physrevb.48.15540

Cited by 109 publications

(43 citation statements)

References 34 publications

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“…From the fitting procedure, we find that both the D-band and G-band position of the a-C:H shift to low wave number compared to that of the a-C film. The G peak shifts from 1500 cm -1 to 1406 cm (10) , The ratio of integrated intensity of the two peak I(D)/I(G) is about 1 for the a-C film with 0.7 eV optical gap, and decreased to 0.5 for the a-C:H film with 1.2 eV optical gap, This behavior is opposite to the observation made by Weller et al, where the higher I(D)/I(G) of the ta-C:H indicating the further structural disorder, corresponding to higher sp 3 content and higher optical gap (11) , But it agrees with the work of Lee et al, where the D and G position tended to be well separated for the more graphite materials and to merge into a broad symmetric peak for the highly disordered carbons (12) , this has been envisaged by the ESR measurement, and will be discussed somewhere.…”

Section: Raman Spectroscopycontrasting

confidence: 56%

The Deposition of a-C:H Films by Pulsed Laser Ablation

Tian¹,

Mishra²,

Soga³

et al. 2004

IEEJ Trans. SM

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A new technique has been introduced to deposit amorphous hydrogenated carbon films (a-C:H) by pulsed laser deposition (PLD). Camphor, a natural source, has played a crucial role for the evolution of the film from amorphous carbon (a-C) to amorphous hydrogenated carbon (a-C:H). This has been confirmed by the presence of C-H stretching bond observed in the FTIR absorption spectra. The influence of camphor incorporation to the optical, electrical, and structural properties of the carbon film has been investigated by UV-visible spectroscopy, FTIR spectroscopy, Hall measurement, and Raman shift. As a kind of photo detectors, a solar cell with a-C:H/p-Si structure has been fabricated, its current-voltage (I-V) characteristics and spectral response are also studied. From the measurement of quantum efficiency, we find that the light sensing property of the new type of a-C:H film have been improved notably. In the short-wavelength region, the a-C:H layer contributes a maximum quantum efficiency as high as 30% despite the light loss by the surface electrode.

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Section: Raman Spectroscopycontrasting

confidence: 56%

The Deposition of a-C:H Films by Pulsed Laser Ablation

Tian¹,

Mishra²,

Soga³

et al. 2004

IEEJ Trans. SM

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show abstract

“…There is a huge discrepancy between our values obtained by EELS and those determined from classical nanohardness measurements in the literature. Graphite is usually said to be one of the softest solid material known to man and the measured hardness is found to lie between 0.1 [24] and 2.4 GPa [25]. This kind of disagreement was also observed on carbon black and soot material.…”

Section: Mechanical Properties Of Carbon Nano-onionsmentioning

confidence: 89%

Anti-wear and Friction Reducing Mechanisms of Carbon Nano-onions as Lubricant Additives

et al. 2008

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Carbon nano-onions have better tribological properties than graphite powder when used as additives dispersed in a poly-alpha-olefin base oil. Carbon nanoonions give a better dispersion in the liquid base oil due to their nanometre-scale size. In particular, the anti-wear efficiency of carbon onions under boundary lubrication and mild wear regime is much better than that of graphite powder. This effect can be attributed to the different structure of the carbon layers in the two species. Highresolution transmission electron microscopy and electron energy-loss spectroscopy were used to characterize the carbon samples, and significant differences in the carbon layer spacing and the density were shown. Wear debris were also observed by the same techniques. In the tribofilm material we depicted new chemical and crystal nanostructures species similar to some microstructures observed in chondrite meteorites, the most interesting one being maghemite iron oxide. The origin of the low friction and wear is still largely unknown.

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“…As a consequence, the thickness of the transfer layer increases. 32 To investigate this phenomenon on the nanocrystalline diamond films, micro-Raman experiments have been performed inside the wear track of film F2 at different loading conditions of 1 N, 3 N and 6 N as shown in Figure 13. It is clearly seen that the intensity of the G band increases with the normal load which indicates that the surface becomes more amorphous.…”

Section: Resultsmentioning

confidence: 99%

Tribological properties of nanocrystalline diamond films deposited by hot filament chemical vapor deposition

et al. 2012

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The dependence of the structural and morphological properties of nanocrystalline diamond films grown by hot filament chemical vapor deposition on the substrate temperature was studied. Friction coefficients of these films were measured and found to vary from high to ultra low, depending on the chemical nature of the films i.e., sp2 and sp3 phase fractions. For all films, the friction coefficient was found to decrease with increase in sp2/sp3 phase fraction. The wear rate follows the trend of the friction coefficient and was likewise found to depend on the structural and morphological properties of the films. For all the films, the friction coefficient is found to decrease with normal load which is ascribed to sliding induced surface amorphization/graphitization

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Raman scattering from ion-implanted diamond, graphite, and polymers

Cited by 109 publications

References 34 publications

The Deposition of a-C:H Films by Pulsed Laser Ablation

The Deposition of a-C:H Films by Pulsed Laser Ablation

Anti-wear and Friction Reducing Mechanisms of Carbon Nano-onions as Lubricant Additives

Tribological properties of nanocrystalline diamond films deposited by hot filament chemical vapor deposition

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