Probing the Nature of Defects of Graphene like Nano-Carbon from Amorphous Materials by Raman Spectroscopy

Mohan, Anu N.; Balachandran, Manoj; Ramya, Athiyanam Venkatesan

doi:10.14233/ajchem.2016.19739

Cited by 21 publications

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“…The ratio of defect to graphitic band (I D /I G ) is found to be 0.84 and 0.86 for the bituminous and sub-bituminous coal respectively. This is a measure of the disorder in the graphitic layer of the coal which is in good agreement with other reported study on graphitic materials (Ramya et al 2013;Mohan et al 2016). These finding are consistent with the XRD analysis obtained for the coal samples showing the evolution of coal structure as function of fraction of amorphous carbon, aromaticity and crystallite size.…”

Section: Spectral Analysis By Spectral Deconvolutionsupporting

confidence: 92%

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A comprehensive analysis of various structural parameters of Indian coals with the aid of advanced analytical tools

Balachandran

2016

Int J Coal Sci Technol

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An exhaustive structural analysis was carried out on three Indian coals (ranging from sub-bituminous to high volatile bituminous coal) using a range of advanced characterization tools. Detailed investigations were carried out using UV-Visible spectroscopy, X-ray diffraction, scanning electron microscopy coupled energy dispersive spectroscopy, Raman spectroscopy and Fourier transform infrared spectroscopy. The X-ray and Raman peaks were deconvoluted and analyzed in details. Coal crystallites possess turbostratic structure, whose crystallite diameter and height increase with rank. The H/C ratio plotted against aromaticity exhibited a decreasing trend, confirming the graphitization of coal upon leaching. It is also found that, with the increase of coal rank, the dependency of I 20 /I 26 on L a is saturated, due to the increase in average size of sp 2 nanoclusters. In Raman spectra, the observed G peak (1585 cm -1 ) and the D2 band arises from graphitic lattices. In IR spectrum, two distinct peaks at 2850 and 2920 cm -1 are attributed to the symmetric and asymmetric -CH 2 stretching vibrations. The intense peak at *1620 cm -1 , is either attributed to the aromatic ring stretching of C=C nucleus.

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Section: Spectral Analysis By Spectral Deconvolutionsupporting

confidence: 92%

“…D 0 bands are broadened resulting in a sharp curve in the 2D region. From the second order spectrum, it is evident that in coal about 6-8 stacked graphene layers are formed with leaching as evident from the X-ray analysis (Elcey and Manoj 2016;Mohan et al 2016).…”

Section: Spectral Analysis By Spectral Deconvolutionmentioning

confidence: 93%

A comprehensive analysis of various structural parameters of Indian coals with the aid of advanced analytical tools

Balachandran

2016

Int J Coal Sci Technol

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“…This ratio is calculated to be 0.69, 0.88 and 0.89 for CSC, CSC-HS and CSCT respectively. The higher value of I D /I G ratio conventionally indicates the effectiveness of the oxidation process which rises the number of defects 39 , 49 . The increased intensity of D band is also attributed to the edge effects present in the graphene network of the sample.…”

Section: Resultsmentioning

confidence: 99%

“…Use of renewable resources for the synthesis of nanostructures has been gaining limelight in recent years 38 , 39 . Yadav et al .…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of graphene-tin oxide nanocomposite derived from agricultural waste for enhanced antibacterial activity against Pseudomonas aeruginosa

Mohan

Balachandran

Panicker³

2019

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Antibacterial screening of graphene-tin oxide nanocomposites synthesized from carbonized wood and coconut shell is investigated against Pseudomonas aeruginosa for the first time. Efficient and facile one step hydrothermal process adopted in the present work for the synthesis of graphene-tin oxide nanoparticles provides an ideal method for the economic large-scale production of the same. Graphene-tin oxide nanocomposites derived from wood charcoal possess a spherical morphology whereas rod like structures are seen in the case of coconut shell derivatives. An excitation independent fluorescence response is observed in graphene-tin oxide nanohybrids while graphene oxide nanostructures exhibited an excitation dependent behavior. These hydrophilic nanostructures are highly stable and exhibited no sign of luminescence quenching or particle aggregation even after a storage of 30 months. Bactericidal effects of the nanostructures obtained from coconut shell is found to be relatively higher compared to those procured from wood. This variation in antibacterial performance of the samples is directly related to their morphological difference which in turn is heavily influenced by the precursor material used. MIC assay revealed that coconut shell derived graphene-tin oxide composite is able to inhibit the bacterial growth at a lower concentration (250 μg/mL) than the other nanostructures. Nanocomposites synthesized from agro-waste displayed significantly higher antimicrobial activity compared to the precursor and graphene oxide nanostructures thereby making them excellent candidates for various bactericidal applications such as disinfectants, sanitary agents etc.

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“…This results in better resolved D and G bands by the gradual removal of the amorphous carbon band overlapping at 1530 cm À1 . [3][4][5]18,39,40 Overall, partial graphitization can be observed from the upward shi of both D and G bands, the decrease in D band width, the more symmetric G band and the overall I D /I G decrease. Higher D and G band frequencies and lower FWHMs are attributed to a higher degree of order in the CBs.…”

Section: Resultsmentioning

confidence: 99%

Low-temperature activation of carbon black by selective photocatalytic oxidation

et al. 2019

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Probing the Nature of Defects of Graphene like Nano-Carbon from Amorphous Materials by Raman Spectroscopy

Cited by 21 publications

References 0 publications

A comprehensive analysis of various structural parameters of Indian coals with the aid of advanced analytical tools

A comprehensive analysis of various structural parameters of Indian coals with the aid of advanced analytical tools

Facile synthesis of graphene-tin oxide nanocomposite derived from agricultural waste for enhanced antibacterial activity against Pseudomonas aeruginosa

Low-temperature activation of carbon black by selective photocatalytic oxidation

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