Raman spectra of graphite edge planes

Katagiri, Gen; Ishida, Hideyuki; Ishitani, A.

doi:10.1016/0008-6223(88)90157-1

Cited by 366 publications

(219 citation statements)

References 12 publications

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“…Our results show that the orientation of crystalline sp 2 carbon with respect to the incident laser beam can have significant effects on the Raman spectrum for highly ordered hexagonal graphite. This observation is in strong agreement with other studies performed on hexagonal graphite and highly orientated pyrolytic graphite (HOPG) (e.g., Katagiri et al, 1988;Wang et al, 1989;Compagnini et al, 1997). If a band has a q < 0.750 and q > 0.125, then that band has arisen from a non-degenerate totally symmetric mode.…”

Section: Marshall and Olcott Marshallsupporting

confidence: 92%

Raman Hyperspectral Imaging of Microfossils: Potential Pitfalls

Marshall

Marshall²

2013

Astrobiology

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Initially, Raman spectroscopy was a specialized technique used by vibrational spectroscopists; however, due to rapid advancements in instrumentation and imaging techniques over the last few decades, Raman spectrometers are widely available at many institutions, allowing Raman spectroscopy to become a widespread analytical tool in mineralogy and other geological sciences. Hyperspectral imaging, in particular, has become popular due to the fact that Raman spectroscopy can quickly delineate crystallographic and compositional differences in 2-D and 3-D at the micron scale. Although this rapid growth of applications to the Earth sciences has provided great insight across the geological sciences, the ease of application as the instruments become increasingly automated combined with nonspecialists using this techique has resulted in the propagation of errors and misunderstandings throughout the field. For example, the literature now includes misassigned vibration modes, inappropriate spectral processing techniques, confocal depth of laser penetration incorrectly estimated into opaque crystalline solids, and a misconstrued understanding of the anisotropic nature of sp 2 carbons. Key Words: Raman spectroscopy-Raman imaging-Confocal Raman spectroscopy-Disordered sp 2 carbons-HematiteMicrofossils. Astrobiology 13, 920-931.

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Section: Marshall and Olcott Marshallsupporting

confidence: 92%

Raman Hyperspectral Imaging of Microfossils: Potential Pitfalls

Marshall

Marshall²

2013

Astrobiology

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“…Moreover, the (002) peak at ~ 26º became more intense and narrower. This fact together with the presence in the profiles of BCNF1-7/2600 and BCNF1-7/2800 materials of the (10) ascribed to edge planes [26]. The spectra of BCNF2-6/2600 and BCNF2-6/2800 materials are shown in Fig.…”

Section: Influence Of Bcnfs Treatment Temperaturementioning

confidence: 71%

“…The development of a more graphite-like structure is associated with the increase of the G-band (after graphite) and the decrease of the D-band (after defects) intensities of the Raman spectrum [23], therefore a decrease of this ratio was expected to occur. The formation of loops between adjacent active edge planes on the graphene layers of the BCNFs during HTT could account for the gap in the evolution of the I D /I t ratio with increasing structural order, as assessed by XRD, since loops are known to contribute to the D' band intensity [36], which in carbons has been ascribed to edge planes [26].…”

Section: Influence Of Bcnfs Compositionmentioning

confidence: 99%

Graphitic nanomaterials from biogas-derived carbon nanofibers

Cuesta

Cameán

Ramos

et al. 2016

Fuel Processing Technology

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Carbon nanofibers with different microstructure and elemental composition that were produced in the catalytic decomposition of synthetic biogas mixtures, in a rotary-bed reactor using nickel and nickel-cobalt catalysts at 600 ºC and 700 ºC, were heat treated in the temperature interval 2600-2800 ºC to explore their ability to graphitize. The influence of treatment temperature as well as carbon nanofibers composition, particularly metallic species, on the structural and textural properties of the materials prepared is discussed. Graphitic nanomaterials with great development of the three-dimensional structure (d 002 ~ 0.3360 nm, L c ~ 48 nm, L a ~ > 100 nm) and low porosity (S BET ~ 20 m 2 g -1 ) have been achieved. Because of the catalytic effect of silicon in the presence of inherent nickel and cobalt metals, more structurally ordered materials were obtained from the carbon nanofibers by adding silica. Based on the results of this work, the utilization of biogasderived carbon nanofibers for the production of synthetic nanographite to be used in different applications, such as electrode material in energy storage devices in which both high degree of graphitic order and small surface area are required, appears feasible.

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“…This is considered to be a factor affecting the Raman spectra because the edge sites of the cup-stacked carbon nanotubes are regarded as edge planes of discontinuous graphite layers with a certain angle. The edge plane spectrum is characterized as having a higher R (R = I D /I G ) value; it has a clearly distinguished D peak and a narrower G peak, as compared with those of nanotubes with basal plane edges [27]. The undulated end planes (see the TEM images in figure 6) caused by the evolution of hydrogen gas at 900-1200 • C are clearly related to conspicuous increases of the R and R values (R = I D /I G ) (figure 8).…”

Section: Resultsmentioning

confidence: 99%