Raman efficiency measurements of graphite

Wada, N.; Solin, S. A.

doi:10.1016/0378-4363(81)90274-6

Cited by 184 publications

(61 citation statements)

References 15 publications

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“…Moreover, FWHM of diamond peak at 1332/1335 cm -1 increased with increasing methane concentration. The area under peak increased with increasing methane concentration as reported earlier by many investigators (Wada and Olin 1981;Shroder et al 1990;Goodwin 1993;Silva et al 1996). Effect of methane concentration on diamond growth rate as determined from different cross-sectional SEM measurements was observed in figure 4, which indicates a general increase with rise of methane concentration.…”

Section: Resultssupporting

confidence: 81%

Low Resistance Polycrystalline Diamond Thin Films Deposited by Hot Filament Chemical Vapour Deposition

et al. 2014

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Abstract. Polycrystalline diamond thin films with outgrowing diamond (OGD) grains were deposited onto silicon wafers using a hydrocarbon gas (CH 4 ) highly diluted with H 2 at low pressure in a hot filament chemical vapour deposition (HFCVD) reactor with a range of gas flow rates. X-ray diffraction (XRD) and SEM showed polycrystalline diamond structure with a random orientation. Polycrystalline diamond films with various textures were grown and (111) facets were dominant with sharp grain boundaries. Outgrowth was observed in flowerish character at high gas flow rates. Isolated single crystals with little openings appeared at various stages at low gas flow rates. Thus, changing gas flow rates had a beneficial influence on the grain size, growth rate and electrical resistivity. CVD diamond films gave an excellent performance for medium film thickness with relatively low electrical resistivity and making them potentially useful in many industrial applications.

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Section: Resultssupporting

confidence: 81%

Low Resistance Polycrystalline Diamond Thin Films Deposited by Hot Filament Chemical Vapour Deposition

et al. 2014

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“…Lespade, Al-Jishi, and Dresselhaus 10 also found that the Raman features were strongly correlated to the mean diamagnetic susceptibility, which itself is sensitive to the size of ordered two-dimensional regions in the graphitic layers. Wada and Solin 11 showed that the E 2g 2 mode of graphite has a 50 times higher Raman scattering cross section than the ''diamond band'' at 1332 cm…”

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confidence: 99%

“…Using the results of Wada and Solin 11 Nemanich et al 12 discussed Raman scattering of DLC thin films based on a carbon composite model. They concluded that the Raman scattering of DLC is similar to microcrystalline graphite from their measurements.…”

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confidence: 99%

Raman spectroscopy on amorphous carbon films

Schwan

Ulrich

Batori

et al. 1996

Journal of Applied Physics

1,249

615

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The origin and interpretation of the Raman features of amorphous ͑hydrogenated͒ carbon films deposited at room temperature in the region of 1000-1700 cm Ϫ1 is discussed in this paper. Possible interpretations of the linewidths, positions of the ''G'' graphite peak and ''D'' disordered peak, and their intensity ratios are examined using results obtained from magnetron sputtered and magnetic field enhanced plasma deposited films. It is shown that even small ''clusters'' of condensed benzene rings ͑cluster size below 20 Å͒ in carbon films can explain the observed Raman scattering. Besides the care that should be taken in the correct interpretation of Raman results, the utility of Raman scattering in obtaining an estimate of cluster sizes in amorphous ͑hydrogenated͒ carbon films is discussed. Carbon films prepared by magnetron sputtering show two additional Raman features at 1180 and 1490 cm Ϫ1 in addition to the G and D peaks. It is shown that a correlation exists between the 1180 cm Ϫ1 peak and the sp 3 content in the films.

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“…The typical wavelengths of excitation (λ exc ) for carbon-based materials are 514 nm (green light) and 244 nm (deep UV light). The first one gives information mainly on the sp 2 domains, because that wavelength has a strong selectivity towards the π states of sp 2 -hybridized carbon species (Wada and Solin 1981). UV Raman, instead, excites both the π and the σ states; therefore it is able to probe both sp 2 and sp 3 carbon species (Gilkes et al 1997).…”

Section: Raman Spectroscopymentioning

confidence: 99%

Activated carbons for applications in catalysis: the point of view of a physical-chemist

Lazzarini

2017

Rend. Fis. Acc. Lincei

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This paper is a concise review on the principal physical-chemical techniques available to investigate the structural and surface properties of activated carbons (ACs) for catalytic applications. The same activated carbon has been characterized by an incredible amount of techniques: Solid State-Nuclear Magnetic Resonance, X-Ray Powder Diffraction and Raman spectroscopy for structural characterization, X-ray Photoelectron Spectroscopy, Inelastic Neutron Scattering and FT-IR spectroscopy for surface analysis, instead. The main goal is to discuss the advantages and disadvantages of all the techniques and to propose a multi-technique approach that should help in avoiding misinterpretations, as often found in the specialized literature.

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Raman efficiency measurements of graphite

Cited by 184 publications

References 15 publications

Low Resistance Polycrystalline Diamond Thin Films Deposited by Hot Filament Chemical Vapour Deposition

Low Resistance Polycrystalline Diamond Thin Films Deposited by Hot Filament Chemical Vapour Deposition

Raman spectroscopy on amorphous carbon films

Activated carbons for applications in catalysis: the point of view of a physical-chemist

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