Fundamentals, overtones, and combinations in the Raman spectrum of graphite

Kawashima, Yohei; Katagiri, Gen

doi:10.1103/physrevb.52.10053

Cited by 302 publications

(207 citation statements)

References 20 publications

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“…Thus, we can exclude spurious shifts due to changes in the laser frequency, which are known to affect the D band of graphite. 16 As in the case of our Raman spectra of GO, the G band initially shifts to higher frequencies during graphite amorphization. 13 A literature survey points to several possible explanations for this blue shift.…”

Section: Intercalation and Stitching Of Graphite Oxide With Diaminoalmentioning

confidence: 83%

“…The hydroxyl groups possess acidic protons, allowing GO to undergo intercalation through ion exchange, analogous to MMT clays. [13][14][15][16] However, unlike MMT, its rich surface chemistry also allows covalent bonding of the intercalant directly to the layers. Chemistries targeted at the hydroxy and epoxy functionalites have been studied previously, with the objective of assessing the reactivity of these functional groups in the intercalated structure, as well as controlling the interlayer spacing and hydrophobicity by careful consideration of the size and molecular structure of the intercalants.…”

Section: Introductionmentioning

confidence: 99%

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Intercalation and Stitching of Graphite Oxide with Diaminoalkanes

et al. 2007

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The intercalation reaction of graphite oxide with diaminoalkanes, with the general formula H 2 N(CH 2 ) n NH 2 (n ) 4-10), was studied as a method for synthesizing pillared graphite with tailored interlayer spacing. Interlayer spacings from 0.8 to 1.0 nm were tailored by varying the size of the intercalant from (CH 2 ) 4 to (CH 2 ) 10 . X-ray diffraction and infrared spectroscopy were used to confirm intercalation, and the frequency of the CH 2 stretch confirmed that the intercalants are in a disordered state, with an important contribution from the gauche conformer. Sequential intercalation of diaminoalkanes followed by dodecylamine demonstrated the inability of these "stitched" systems to undergo expansion along the c-direction, indicative of cross-linking. Finally, the reaction of graphite oxide with diaminoalkanes under reflux and for extended periods (>72 h) resulted in the chemical reduction of the graphite oxide to a disordered graphitic structure.

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Section: Intercalation and Stitching Of Graphite Oxide With Diaminoalmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Intercalation and Stitching of Graphite Oxide with Diaminoalkanes

et al. 2007

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“…9) also show ␣-quartz (464 cm −1 (A 1g )) and amorphous carbon (1350 and 1600 cm −1 ) [41,42] at a depth of about 50 m into the glaze. This profiling method is useful in establishing for example that indeed the amorphous carbon is not on the glaze surface but inside the glaze towards the glaze/body interface and could very well be a trace contaminant that was introduced at the time of manufacture of the tile.…”

Section: White Pigmentmentioning

confidence: 99%

Raman analysis of ancient pigments on a tile from the Citadel of Algiers

Kock

Waal

2008

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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a b s t r a c tA micro-Raman spectroscopy study of a multi-coloured (yellow, blue, white, redish-brown and brownblack) tile shard from the Citadel of Algiers was undertaken. XRD and EDX were used as complementary techniques. The study shows that the heterogeneous three-shade yellow pigment on the tile is composed largely of the ancient ternary (Pb-Sn-Sb) pyrochlore oxide with a dominant Pb-O vibration at 127 cm

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“…The D band can be decomposed in two main components at 1281 and 1310 cm -1 as is usual in disordered graphite and MWNTs . We identify the shoulder at 1176 cm -1 as the manifestation of a weak dispersive mode (sometimes called T-mode) observed in disordered MWNTs, graphite, and other non-planar sp 2 carbons in the 1084-1100 cm -1 range (Kawashima, 1995;Li, 1997;Tan, 2004). As seen in our SEM and TEM images, all those types of carbon structures may coexist in our highly inhomogeneous samples.…”

Section: Irradiation Of Quartz Ampoules Partially Submerged In Watermentioning

confidence: 68%