Micro Raman Investigation of Graphene Synthesized by Atmospheric Pressure CVD on Copper Foil from Decane

Komissarov, I.; Kovalchuk, N. G.; Kolesov, E. A.; Тиванов, М. С.; Королик, О. В.; Mazanik, A.V.; Shaman, Yu. P.; Basaev, A. S.; Лабунов, В. А.; Prischepa, S. L.; Каргин, Н. И.; Ryzhuk, R. V.; Shostachenko, S. A.

doi:10.1016/j.phpro.2015.09.091

Cited by 14 publications

(11 citation statements)

References 13 publications

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“…In addition, as it was shown in [ 59 ] for dendritically shaped graphene single crystals (low partial pressure of hydrogen), multiple small adlayers are favorable. Therefore, we believe that during the C 10 H 22 decomposition there is enough hydrogen to terminate the graphene edges [ 13 ].…”

Section: Discussionmentioning

confidence: 99%

“…The above experimental procedure has been previously reported in [ 13 – 14 ]. The key differences in the current experimental approach are related to the position of the copper foil in the reactor, the thickness of the copper and the feed rate of n -decane.…”

Section: Methodsmentioning

confidence: 99%

“…The key differences in the current experimental approach are related to the position of the copper foil in the reactor, the thickness of the copper and the feed rate of n -decane. In addition, in previous publications [ 13 – 14 ], the aspect of nitrogen doping of graphene has not been investigated.…”

Section: Methodsmentioning

confidence: 99%

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Nitrogen-doped twisted graphene grown on copper by atmospheric pressure CVD from a decane precursor

Komissarov¹,

Kovalchuk²,

Лабунов³

et al. 2017

Beilstein J. Nanotechnol.

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We present Raman studies of graphene films grown on copper foil by atmospheric pressure CVD with n-decane as a precursor, a mixture of nitrogen and hydrogen as the carrier gas, under different hydrogen flow rates. A novel approach for the processing of the Raman spectroscopy data was employed. It was found that in particular cases, the various parameters of the Raman spectra can be assigned to fractions of the films with different thicknesses. In particular, such quantities as the full width at half maximum of the 2D peak and the position of the 2D graphene band were successfully applied for the elaborated approach. Both the G- and 2D-band positions of single layer fractions were blue-shifted, which could be associated with the nitrogen doping of studied films. The XPS study revealed the characteristics of incorporated nitrogen, which was found to have a binding energy around 402 eV. Moreover, based on the statistical analysis of spectral parameters and the observation of a G-resonance, the twisted nature of the double-layer fraction of graphene grown with a lower hydrogen feeding rate was demonstrated. The impact of the varied hydrogen flow rate on the structural properties of graphene and the nitrogen concentration is also discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Nitrogen-doped twisted graphene grown on copper by atmospheric pressure CVD from a decane precursor

Komissarov¹,

Kovalchuk²,

Лабунов³

et al. 2017

Beilstein J. Nanotechnol.

View full text Add to dashboard Cite

show abstract

“…Graphene films of lower defects and thickness of monolayers can be grown on copper substrate using the CVD method [10][11][12][13]. This method employs vacuum furnace and flow meters, as well as hydrocarbon precursors (e.g., methane) and hydrogen, in order to facilitate the necessary chemical reactions.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Porous GaN-Based UV Photodetector with Graphene Cladding

et al. 2021

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This work presents the role of graphene in improving the performance of a porous GaN-based UV photodetector. The porous GaN-based photodetector, with a mean pore diameter of 35 nm, possessed higher UV sensitivity, about 95% better compared to that of the as-received (non-porous) photodetector. In addition, it exhibits a lower magnitude of leakage current at dark ambient, about 70.9 μA, compared to that of the as-received photodetector with 13.7 mA. However, it is also highly resistive in nature due to the corresponding electrochemical process selectively dissolute doped regions. Herein, two types of graphene, derived from CVD and the electrochemical exfoliation (EC) process, were cladded onto the porous GaN region. The formation of a graphene/porous GaN interface, as evident from the decrease in average distance between defects as determined from Raman spectroscopy, infers better charge accumulation and conductance, which significantly improved UV sensing. While the leakage current shows little improvement, the UV sensitivity was greatly enhanced, by about 460% and 420% for CVD and EC cladded samples. The slight difference between types of graphene was attributed to the coverage area on porous GaN, where CVD-grown graphene tends to be continuous while EC-graphene relies on aggregation to form films.

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“…The usual method of CVD synthesis of graphene on a catalyst substrate involves several stages [7] that depend to a signifi cant degree on the type of precursor [11]. By using other hydrocarbons with different molecular mass as precursors it is possible to control the synthesis more effectively on account of change in the kinetics of growth of the graphene [11,13].…”

mentioning

confidence: 99%

Raman Spectra of Graphene Synthesized by Chemical Vapor Deposition from Decane

et al. 2018

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Raman spectroscopy was used to study the structural properties of graphene synthesized by chemical vapor deposition using decane (C 10 H 22 ) as a precursor at various hydrogen concentrations. Reduction of the carrier gas fl ow rate from 150 cm 3 /min to zero changes the average spacing between the defects from 53 to 212 nm and the average grain size from 87 to 798 nm and changes the uniformity and continuity of the graphene layer. The obtained relationships can be used to control the defectiveness, homogeneity, and continuity of the graphene layer of the coating during synthesis by this method.

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Micro Raman Investigation of Graphene Synthesized by Atmospheric Pressure CVD on Copper Foil from Decane

Cited by 14 publications

References 13 publications

Nitrogen-doped twisted graphene grown on copper by atmospheric pressure CVD from a decane precursor

Nitrogen-doped twisted graphene grown on copper by atmospheric pressure CVD from a decane precursor

Improvement of Porous GaN-Based UV Photodetector with Graphene Cladding

Raman Spectra of Graphene Synthesized by Chemical Vapor Deposition from Decane

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