Characterization of Graphite Fiber Surfaces with Raman Spectroscopy

Tuinstra, F.; Koenig, Jack L.

doi:10.1177/002199837000400405

Cited by 455 publications

(209 citation statements)

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“…The R ratio decreased with the increase of La. 5) Thus, the R ratio can be used to evaluate perfection degree of graphite structure. Katagiri et al 8) made the map using R ratio and half width of peak for the more precise characterization of materials.…”

Section: Evaluation Methods Of Carbonaceous Materialsmentioning

confidence: 93%

“…with Raman Spectrum Analysis There have been many reports on the evaluation method of ordered materials with Raman spectrum analysis, namely, 1) peak intensity ratio, 5) 2) peak area ratio, 6) 3) half width of peak. 7) The peak ratio of D band peak to G band peak is called R ratio, RϭI D /I G .…”

Section: Evaluation Methods Of Carbonaceous Materialsmentioning

confidence: 99%

“…In the present work, the Raman spectroscopy analysis was carried out to examine the reaction mechanism from the viewpoint of bonding structure of carbon atoms in various carbonaceous materials. Although many papers have been published on the structure analysis by the Raman spectroscopic analysis, [4][5][6][7][8][9][10][11][12] the universal evaluation method has not yet been developed for materials which have widely different structure. The Raman spectra of various materials from natural graphite to glassy carbon were compared.…”

Section: Introductionmentioning

confidence: 99%

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Structure Analysis of Coke, Wood Charcoal and Bamboo Charcoal by Raman Spectroscopy and Their Reaction Rate with CO2

et al. 2005

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In order to discuss the reactivity of carbonaceous materials with CO 2 , the Raman spectroscopy analysis was carried out. Nine kinds of materials were examined. The Raman spectra of ordered materials could be assigned to the graphite structure and its defect, but those of disordered materials could not. New parameters were derived to evaluate the structure of the latter. Using the parameters, the structure change was followed during high temperature heat treatment. The disordered material consists of random structure, graphite structure and its defects. The random structure changes to the graphite structure with many defects and the defects decrease with the heat treatment temperature. The reaction rate constant is evaluated. It increases when the structure changes from the random structure to the graphite structure with many defects. After the change, it decreases with decreasing the defects in graphite structure. Thus, the most reactive material should consist of the graphite structure with many defects.KEY WORDS: natural and synthetic graphite; coke; wood charcoal; bamboo charcoal; Raman spectroscopy; reactivity with CO 2 ; new parameters to evaluate structure; structure change during heat treatment; highly reactive material.

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Section: Evaluation Methods Of Carbonaceous Materialsmentioning

confidence: 93%

Section: Evaluation Methods Of Carbonaceous Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Structure Analysis of Coke, Wood Charcoal and Bamboo Charcoal by Raman Spectroscopy and Their Reaction Rate with CO2

et al. 2005

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“…The Raman results can be used to get some insight in this problem. In fact Tuinstra and Koenig demonstrated that the intensity ratio I D /I G is inversely proportional to the in plane crystallites size and proposed a formula which is valid for the 514.5 nm excitation wavelength only [22,23]. A general equation, that can be used for every wavelength, is given in [17]:…”

Section: Resultsmentioning

confidence: 99%

Raman investigation of laser-induced structural defects of graphite oxide films

Romano

Torrisi

Cutroneo

et al. 2018

EPJ Web of Conferences

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Abstract. Since the beginning of intensive studies on graphene and graphitic materials, Raman spectroscopy has always been used as a characterisation technique. This is due to two main reasons: the non-destructive nature of this experimental technique and its ability to distinguish between the plethora of existing carbon materials. One of the most challenging research activities concerns the production of graphene microcircuits. To address this issue, a possible strategy is to directly reduce and pattern graphite oxide (GO) film by laser irradiation. The objective of this study is to evaluate the laser irradiation-induced structural changes on thin GO films by using Micro-Raman spectroscopy.We used as a source a Nd:YAG laser (1064 nm) and different laser fluences: 15 J/cm 2 , 7.5 J/cm 2 and 5 J/cm 2 . We have analyzed the modifications of the main Raman contributions of these graphitic materials: the D band (defect induced band), the G band (band due to sp 2 hybridized carbon atoms) and the 2D band (D band overtone). In particular, we found out that our figure of merit (FOM) parameters, i.e. the intensity ratio I D /I G (for the D band and G band) and I 2D /I G (for the 2D band and G band), change with the laser fluences, revealing a different effect induced by the laser irradiation. The best results are found in the sample irradiated with 5 J/cm 2 , suggesting that higher fluences do not lead to better results.

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“…These parameters are L a and L c . 19,20 L a is the average diameter of the graphite layer, whereas L c divided by the interlayer spacing (approximately 3.35Å) gives the number of layers. Well-crystallized graphite can have L a values up to several thousand angstrom, whereas microcrystalline graphite, also referred to as amorphous graphite, can have L a values as low as 20-30Å.…”

Section: Graphitementioning

confidence: 99%