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The effects of carbon coating onto graphite filler on the structure and properties of carbon foams
Ji-Hyun Kim, Do Young Kim, Young-Seak Lee 한국탄소학회 Carbon Letters 5 Pages
한국탄소학회 Carbon Letters 2017, Vol.21 16 111-115 (5 pages)
1, which were attributed to the vibrations of C-coated graphite. D-mode was analyzed by the A1g vibrations of defective sp 2 structures at 1350 cm 1, which were attributed to the vibrations of non-graphitic structures in the C-coated graphite [27]. The crystalline structure of C-coated graphite was confrmed using the D to G peak in- tensity ratio (ID/IG), which were indicated to be 0.18, 0.20... Carbon foams (CFms) are of crucial importance in electrical and mechanical devices due to their high thermal conductivity used for eliminating high heat flow and maintaining low temperatures [1]. The most common CFms are types of aluminum alloys, copper and diamond. However, the mechanical properties of metal-based heat sink materials are difficult to control at temperatures over 550°C [2,3]. Thus, CFms are actively investigated as heat sink materials because of their good properties, such as... -
Effect of carbonization temperature on crystalline structure and properties of isotropic pitch-based carbon fiber
Jung Dam Kim, Jae-Seung Roh, Myung-Soo Kim 한국탄소학회 Carbon Letters 10 Pages
한국탄소학회 Carbon Letters 2017, Vol.21 6 51-60 (10 pages)
representing the graphitic structure and structural disorder within the graphene planes, respectively. To obtain accurate spectroscopic parameters, a curve-ftting procedure was conducted for the Raman spectra shown in Fig. 8. The spectroscopic parameters obtained by curve-ftting the three peaks (D, G and D3) using Gaussian functions are presented in Tables 5 and 6. The relatively broad G and... Isotropic pitch-based fibers produced from coal tar pitch with the melt-blowing method were carbonized at temperatures ranging from 800 to 1600oC to investigate their crystalline structure and physical properties as a function of the carbonization temperature. The in-plane crystallite size (La) of the carbonized pitch fiber from X-ray diffraction increased monotonously by increasing the carbonization temperature resulting in a gradual increase in the electrical conductivity from 169 to 3800... -
Molecular structure effects of the pitches on preparation of activated carbon fibers from electrospinning
김보혜, ArshadHussainWazir, 양갑승, 방윤혁, 김성령 한국탄소학회 Carbon Letters 11 Pages
한국탄소학회 Carbon Letters 2011, Vol.12 No.2 2 70-80 (11 pages)
of the molecular structure of two differ- ent types of pitches on the electrospinning, stabilization, carbonization and activation characteristics. ..PAGE:2 Molecular structure efects of activated carbon fbers 71 http://carbonlett.org 2. Experimental 2.1 Materials The pitch precursors (PPs) were provided through condensa- tion of pyrolyzed fuel oil (PFO) with Cl2 by Hanwha Chemical Co. Korea... -
Graphene Based Electrochemical DNA Biosensor for Detection of False Smut of Rice (Ustilaginoidea virens)
Kritika Rana, Jagjiwan Mittal, Jagriti Narang, Annu Mishra, Ramesh Namdeo Pudake 한국식물병리학회 The Plant Pathology Journal 8 Pages
한국식물병리학회 The Plant Pathology Journal 2021, 37권 3호 8 291-298 (8 pages)
respectively. ..PAGE:5 DNA Biosensor for Rice False Smut Detection 295 distance of 3.353 A. This coupled with the EDS study in Fig. 2C shows the existence of graphitic structure between the graphene layers. The distance between graphene layers was measured at >25 different sites on graphene and found it consistent. Crystallization study using XRD of pristine graphene is shown in Fig. 4. A... False smut caused by Ustilaginoidea virens is an impor- tant rice fungal disease that significantly decreases its production. In the recent past, conventional methods have been developed for its detection that is time-consuming and need high-cost equipments. The research and development in nanotechnology have made it possible to assemble efficient recognition interfaces in biosensors. In this study, we present a simple, sensitive, and selective oxidized graphene-based geno-biosensor for the... -
고주파 유도결합 열플라즈마를 이용한 다중벽 탄소나노튜브 합성
남준석, 서준호 한국열환경공학회 열환경공학 8 Pages
한국열환경공학회 열환경공학 2012, 제 9권 1호 2 9-16 (8 pages)
of RF thermal plasma torch for synthesis of CNTs. Quartz Guide Graphite Liner Coolant Fig. 3. Internal structure of reaction chamber in Fig. 1. Fig. 2는 본 연구에 이용된 고주파 토치의 단면과 토치 냉각수, 플라즈마 기체와 반응물의 흐름을 보여주고 있다. Fig. 2의 고주파 토치 내, 플라즈 마 가둠관의 안쪽 지름은 50 mm이며 수냉식 석 영관을 사용하였으며, 유도 코일의 감은 수는 4회, 코일 간 간격은 15 mm... -
Graphitization of PAN-based carbon fibers by CO₂ laser irradiation
Liangbo Yao, Weimin Yang, Sanyang Li, Yang Sha, Jing Tan, Ying An, Haoyi Li 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2017, Vol.24 13 97-102 (6 pages)
infrared laser-induced carbonization of PAN-nanofber mats was able to get much higher surface areas and smaller pores than the classical thermal carbonization methods. Blaker et al. [7] modifed the structure of CFs using a laser, obtaining increased pullout characteristics, better fber surface and an expanded graphitization region at the predetermined points. All these previous studies indicat... Graphite fibers are materials with a high specific modulus that have attracted much interest in the aerospace industry, but their high manufacturing cost and low yield are still problems that prevent their wide applications in practice. This paper presents a laser-based process for graphitization of carbon fiber (CF) and explores the effect of laser radiation on the microstructure of CF. The obtained Raman spectra indicate that the outer surface of CF evolves from turbostratic structures into a... -
Physicochemical properties and methane adsorption performance of activated carbon nanofibers with different types of metal oxides
Faten Ermala Che Othman, Norhaniza Yusof, Hasrinah Hasbullah, Juhana Jaafar, Ahmad Fauzi Ismail, Noor Shawal Nasri 한국탄소학회 Carbon Letters 8 Pages
한국탄소학회 Carbon Letters 2017, Vol.24 11 82-89 (8 pages)
the International Union of Pure and Applied Chemistry (IUPAC) classifcation, the isotherms of the ACNFs are typical type II which represent the abundance of micropores and mesopores in the porous structure (indicated by the long plateau). The graph plotted in Fig. 4 shows that the adsorption of nitrogen was complete at a relatively low pressure which was about 0.1 bar. As can be seen with t... that of the pristine ACNFs and ACNF/MnO2 which is 478 and 430 m2 g?1, respectively. FTIR analysis showed peaks of 476 and 547 cm?1, indicating the presence of MgO and MnO2, respectively. The FESEM micrographs analysis showed a smooth but coarser structure in all the ACNFs. Meanwhile, the ACNF/MgO has the smallest fiber diameter (314.38±62.42 nm) compared to other ACNFs. The presence of MgO and MnO2 inside the ACNFs was also confirmed with EDX analysis as well as XRD. The adsorption capacities... -
Interconnected meso/microporous carbon derived from pumpkin seeds as an efficient electrode material for supercapacitors
Mayakrishnan Gopiraman, Somasundaram Saravanamoorthy, Seung-Hyun Kim, Ill-Min Chung 한국탄소학회 Carbon Letters 9 Pages
한국탄소학회 Carbon Letters 2017, Vol.24 10 73-81 (9 pages)
cm 3 g 1). The well- condensed graphitic structure of the prepared activated carbon materials was confrmed by Raman and X-ray diffraction analyses. The presence of heteroatoms (O and N) in the carbon materials was confrmed by X-ray photoemission spectroscopy. High resolution transmission electron microscopic images and selected area diffraction patters further revealed the porous structure and... m2 g?1) with excellent pore volumes (0.27?1.30 cm3 g?1). The wellcondensed graphitic structure of the prepared activated carbon materials was confirmed by Raman and X-ray diffraction analyses. The presence of heteroatoms (O and N) in the carbon materials was confirmed by X-ray photoemission spectroscopy. High resolution transmission electron microscopic images and selected area diffraction patters further revealed the porous structure and amorphous nature of the prepared electrode materials. The... -
Preparation of photoresist-derived carbon micropatterns by proton ion beam lithography and pyrolysis
Hui-Gyun Nam, Jin-Mook Jung, In-Tae Hwang, Junhwa Shin, Chang-Hee Jung, Jae-Hak Choi 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2017, Vol.24 8 55-61 (7 pages)
Letters Vol. 24, 55-61 (2017) DOI: http://dx.doi.org/10.5714/CL.2017.24.055 58 graphic techniques. In conjunction with Raman spectroscopy, XRD analysis was performed to investigate the formation of graphitic crystalline structures in the CMs. As shown in Fig. 8a, the pristine SU-8 ex- hibited no refection, indicating the amorphous structure of the SU-8 flms. On the other hand, as seen in the X... fabricated from a negative-type SU-8 photoresist by proton ion beam lithography and pyrolysis. Well-defined negative-type SU-8 micropatterns were formed by proton ion beam lithography at the optimized fluence of 1×1015 ions cm?2 and then pyrolyzed to form CMs. The crosslinked network structures formed by proton irradiation were converted to pseudo-graphitic structures by pyrolysis. The fabricated CMs showed a good electrical conductivity of 1.58×102 S cm?1 and a very low surface roughness. -
Improvement of gas sensing properties of carbon nanofibers based on polyacrylonitrile and pitch by steam activation
Jeongsik Kim, Hyung-Il Kim, Jumi Yun 한국탄소학회 Carbon Letters 5 Pages
한국탄소학회 Carbon Letters 2017, Vol.24 5 36-40 (5 pages)
a higher electrical conductivity was obtained. Impurities and other components in the polymer are removed during carbonization at high temperature [18]. Carbonization changes both non-graphitic PAN and pitch to a graphitic structure which is favorable for Fig. 1. Field-emission scanning electron microscope micrographs of the nano bers (a) NFs-2.8, (b) NFs-3.3, (c) NFs-3.75, and (d) NFs-4.5... nanofibers were activated with steam at various temperatures followed by subsequent carbonization to make carbon nanofibers with a highly conductive graphitic structure. Steam activation was effective in facilitating gas adsorption onto the carbon nanofibers due to the increased surface area. The carbon nanofibers activated at 800°C had a larger surface area and a lower micro pore fraction resulting in a higher variation in electrical resistance for improved CO gas sensing properties.