Raman Spectroscopy of Graphitic Foams

Barros, Eduardo B.; Demir, Nasser; Filho, A. G. Souza; Filho, Josué M.; Jório, Ado; Dresselhaus, G.; Dresselhaus, M. S.

doi:10.1557/proc-851-nn8.12

Cited by 9 publications

(14 citation statements)

References 9 publications

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“…3(b)]. [36][37][38] In general, the relative intensity ratio for the D-to G-band, I (D)/I(G), and the broadening of the peak are used for characterizing the disorder and crystallite size in graphitic materials. 3(a)].…”

Section: Resultsmentioning

confidence: 99%

Carbon Interlayer Between CVD SiC and SiO₂in High‐Temperature Passive Oxidation

2014

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The oxidation behavior of high‐purity silicon carbide (SiC) prepared by chemical vapor deposition was investigated by thermogravimetry, transmission electron microscopy, and Raman spectroscopy in the temperature range 1534–1902 K in pure O2. The carbon layer formed at the SiC/SiO2 interface upon oxidation above 1784 K. Raman peaks corresponding to D‐ and G‐bands could be identified from the carbon layer. Bubbles were observed in the SiO2 scale after the oxidation at 1873 K. This could be attributed to the accumulation of CO gas at the SiC/SiO2 interface, resulting in the formation of the carbon layer and bubbles. These suggest that the oxidation rate of SiC is limited by the outward diffusion of CO in the SiO2 scale in this temperature range.

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Section: Resultsmentioning

confidence: 99%

Carbon Interlayer Between CVD SiC and SiO₂in High‐Temperature Passive Oxidation

2014

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“…7(b). A clear difference is that two defect-induced Raman bands, denoted D (1350 cm 1 ) and D' (1620 cm 1 ) bands [42,60], were observed after deposition. The observation of D and D' bands indicates that defects were introduced into the graphene after deposition of the 5 nm SiO 2 top layer.…”

Section: Process-induced Defects and Strain On Graphenementioning

confidence: 93%

“…The Raman spectrum of single layer EG has fi ve peaks, located at 1368, 1520, 1597, 1713, and 2715 cm 1 , of which the peaks at 1520 and 1713 cm 1 are from the SiC substrate. The 1368 cm 1 peak is the socalled defect-induced D band; the 1597 cm 1 peak is the in-plane vibrational G band; and the 2715 cm 1 peak is the two-phonon 2D band [60]. The Raman signal of single layer MCG is much stronger (~10 times) than that of EG on the SiC substrate.…”

Section: Nano Researchmentioning

confidence: 98%

Raman spectroscopy and imaging of graphene

et al. 2008

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Graphene has many unique properties that make it an ideal material for fundamental studies as well as for potential applications. Here we review recent results on the Raman spectroscopy and imaging of graphene. We show that Raman spectroscopy and imaging can be used as a quick and unambiguous method to determine the number of graphene layers. The strong Raman signal of single layer graphene compared to graphite is explained by an interference enhancement model. We have also studied the effect of substrates, the top layer deposition, the annealing process, as well as folding (stacking order) on the physical and electronic properties of graphene. Finally, Raman spectroscopy of epitaxial graphene grown on a SiC substrate is presented and strong compressive strain on epitaxial graphene is observed. The results presented here are highly relevant to the application of graphene in nano-electronic devices and help in developing a better understanding of the physical and electronic properties of graphene.

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“…The I D / I G ratio is calculated for GO used in this work as 1.2 based on the spectrum shown in Figure . The increased D band intensity is attributed to the disorder and defects introduced by the formation of sp 3 hybridized carbons and the presence of the oxygen‐containing groups . The Raman spectra of the PMMA‐GO‐PCs displayed in Figure show that the I D / I G ratio decreases by increasing the PMMA colloidal size in the PCs as reported in Table .…”

Section: Resultsmentioning

confidence: 82%

“…All the samples containing GO show the characteristic G and the D Raman bands around 1582 and at 1350 cm −1 , respectively . The D peak is known as the defect‐induced peak, and the intensity ratio I D / I G is usually taken as a measure of the extent of defects in the graphene lattice . The I D / I G ratio is calculated for GO used in this work as 1.2 based on the spectrum shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

Optical and physical properties of iridescent photonic crystals obtained by self‐assembled polymethyl methacrylate nanospheres within graphene oxide nanoplatelets

Haddadine

Agoudjil

AbouZeid

et al. 2017

Polymers for Advanced Techs

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Opal photonic crystals prepared by vertical templating of polymethyl methacrylate (PMMA) nanospheres in aqueous graphene oxide (GO) solutions were successfully obtained. The resultsshow that increasing the PMMA nanospheres' size leads to the modification of the d-spacing in GO nanoplatelets, inducing brilliant iridescence colors that span the entire visible electromagnetic spectrum. Scanning electron microscopy study shows a uniform distribution of GO nanoplatelets on the surface and the bulk of the opal photonic crystals. The reflectance spectra exhibit a significant red shift from 385 to 660 nm when the nanospheres' size increases from 160 to 306 nm, respctively. The Raman spectra show a systematic decrease in the intensity ratio of the D to G bands of GO (I D /I G ), suggesting a partial reduction of graphene oxide with decrasing the extent of defects in the partially reduced GO nanoplatelets. This finding is confirmed by the significant decrease observed in the intensity of the hydroxyl band in the attenuated total reflectance mode-Fourier transform infrared spectra of the photonic crystals. The results provide the first demonstrated example of intercalated assemblies of polymer nanospheres within GO nanosheets, leading to photonic crystals with brilliant iridescence colors that span the entire visible electromagnetic spectrum and can be tuned only by varying the size of the PMMA nanospheres.

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Raman Spectroscopy of Graphitic Foams

Cited by 9 publications

References 9 publications

Carbon Interlayer Between CVD SiC and SiO₂in High‐Temperature Passive Oxidation

Carbon Interlayer Between CVD SiC and SiO₂in High‐Temperature Passive Oxidation

Raman spectroscopy and imaging of graphene

Optical and physical properties of iridescent photonic crystals obtained by self‐assembled polymethyl methacrylate nanospheres within graphene oxide nanoplatelets

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Raman Spectroscopy of Graphitic Foams

Cited by 9 publications

References 9 publications

Carbon Interlayer Between CVD SiC and SiO2in High‐Temperature Passive Oxidation

Carbon Interlayer Between CVD SiC and SiO2in High‐Temperature Passive Oxidation

Raman spectroscopy and imaging of graphene

Optical and physical properties of iridescent photonic crystals obtained by self‐assembled polymethyl methacrylate nanospheres within graphene oxide nanoplatelets

Contact Info

Product

Resources

About

Carbon Interlayer Between CVD SiC and SiO₂in High‐Temperature Passive Oxidation

Carbon Interlayer Between CVD SiC and SiO₂in High‐Temperature Passive Oxidation