Carbon Letters 2021 KCI Impact Factor : 0.52

Korean | English

pISSN : 1976-4251 / eISSN : 2233-4998

http://journal.kci.go.kr/carbon
Aims & Scope
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Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.
Editor-in-Chief
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Yunsuk Huh

(Inha University)

Citation Index
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  • KCI IF(2yr) : 0.52
  • KCI IF(5yr) : 0.39
  • Centrality Index(3yr) : 0.459
  • Immediacy Index : 0.1638

Current Issue : 2021, Vol.31, No.6

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  • Thermal reduction of graphite oxide in the presence of nitrogen-containing dyes

    Barkauskas Jurgis | Gaidukevič Justina | Niaura Gediminas | 2021, 31(6) | pp.1097~1110 | number of Cited : 0
    Abstract
    Thermal reduction of graphite oxide (GO) is considered as a prospective method for the preparation of high-performance graphene-based materials. However, this method has certain limitations, and the major is that this exothermic process is diffcult to control. In this research, we focused on the kinetic studies of the reduction of graphite oxide using non-isothermal diferential calorimetry (DSC) method. Six GO nanocomposites with dyes were tested to study the shift in kinetic parameters. The apparent reaction order is determined to be ca 0.7 for the thermal decomposition of pure GO, while in the presence of dye molecules it increases sometimes reaching a value of 2.0 for higher dye concentrations. Decisively, the thermal decomposition of pure GO can be presented as an intermediate between a zero- and frst-order reaction, while the introduction of dye molecules turns a certain part of the energy consumption via the bimolecular pathway. Our research revealed that the process of GO thermal decomposition can be operated and properties of the fnal product (reduced graphene oxide (rGO) and its derivatives) can be adjusted more precisely using additive molecules, which interact with GO sheets.
  • Performance evaluation of Al6061-graphene nanocomposites surface engineered by a novel multiple microchannel reinforcement approach in friction stir processing

    Sharma Abhishek | Das Tanmoy | Paul Jinu | 2021, 31(6) | pp.1111~1124 | number of Cited : 0
    Abstract
    In this paper, the performance evaluation of Al-graphene nanoplatelets (GNP) composites surface engineered by a modifed friction stir processing (FSP) is reported. Here, multiple micro channels (MCRF) are used to incorporate GNPs in the aluminium matrix instead of a single large groove (SCRF) that is usually used in conventional FSP. With the MCRF approach,~18% higher peak temperature (compared to SCRF) was observed owing to the presence of aluminium sandwiched between consecutive microgrooves and higher heat accumulation in the stir zone. The MCRF approach have signifcantly reduced the coefcient of friction and wear rates of the processed composites by~14% and~57%, respectively as compared to the SCRF approach. The proposed reinforcement flling method signifcantly improves the particle dispersion in the matrix, which in turn changes the adhesion mode of wear in SCRF to abrasive mode in MCRF fabricated composites. The uniformly squeezed out GNP tribolayer prevented the direct metal to metal contact between composite and its counterpart which have efectively reduced the deterioration rates.
  • A new insight into the structural modulation of graphene oxide upon chemical reduction probed by Raman spectroscopy and X-ray diffraction

    Chadha Neakanshika | Sharma Rahul | Saini Parveen | 2021, 31(6) | pp.1125~1131 | number of Cited : 0
    Abstract
    Lately, Raman spectroscopy has become powerful tool for quality assessment of graphene analogues with identifcation of intensity ratio of Raman active D-band and G-band (ID/IG ratio) as a vital parameter for quantifcation of defects. However, during chemical reduction of graphitic oxide (GrO) to reduced GrO (RGrO), the increased ID/IG ratio is often wrongly recognized as defect augmentation, with “formation of more numerous yet smaller size sp2 domains” as its explanation. Herein, by giving due attention to normalized peak height, full-width half-maxima and integrated peak area of Raman D- and G-bands, and compliment the fndings by XRD data, we have shown that in-plane size of sp2 domains actually increases upon chemical reduction. Particularly, contrary to increased ID/IG ratio, the calculated decrease in integrated peak area ratio (AD/AG ratio) in conjunction with narrowing of D-band and broadening of G-band, evinced the decrease in in-plane defects. Finally, as duly supported by reduction induced broadening of interlayer-spacing characteristic XRD peak and narrowing of~43° centered XRD hump, we have also shown that the sp2 domains actually expands in size and the observed increase in ID/IG ratio is indeed due to increase in across-plane defects, formed via along-the-layer slicing of graphitic domains.
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