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Carbon 85건

  1. [해외논문]   Editorial Board   SCI SCIE


    Carbon v.132 ,pp. ii - ii , 2018 , 0008-6223 ,

    초록

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  2. [해외논문]   High-yield and high-throughput single-chirality enantiomer separation of single-wall carbon nanotubes   SCI SCIE

    Wei, Xiaojun (Corresponding author.) , Tanaka, Takeshi , Hirakawa, Takuya , Tsuzuki, Mayumi , Wang, Guowei , Yomogida, Yohei , Hirano, Atsushi , Kataura, Hiromichi
    Carbon v.132 ,pp. 1 - 7 , 2018 , 0008-6223 ,

    초록

    Abstract Single crystals of single-wall carbon nanotubes are desired for precise analysis of the physical properties of carbon nanotubes, necessitating preparation of single-chirality enantiomers in large quantities. In this work, by investigating the effects of surfactant concentration and temperature on the enantiomer separation, we achieved large-scale single-chirality enantiomer separation for the first time using triple surfactant stepwise elution chromatography with a naturally produced dextran-based gel as the column medium. Through one-round programmed separation, milligram-scale of (11,–5) (equivalent to (5,6)) and (6,5) enantiomers were separated from CoMoCAT carbon nanotube soot. The separation yields estimated from the optical absorbance at 280 nm were 5.6% (11,−5) and 2.6% (6,5) per load of all SWCNTs, which correspond 28% and 13% per load of total (11,–5) and (6,5) enantiomers, respectively. This high yield is mainly attributed to the narrow chirality distribution and high concentrations of (11,–5) and (6,5) in CoMoCAT and the high-resolution selectivity of the triple surfactant system for two enantiomers. The high throughput is sufficient to prepare high-purity (11,–5) and (6,5) bucky papers. Graphical abstract [DISPLAY OMISSION]

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  3. [해외논문]   Phosphorus-assisted solid-phase approach to three-dimensional highly porous graphene sheets and their capacitance properties   SCI SCIE

    Chen, Chunlin (Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road, Ningbo 315201, China ) , Liang, Ting (Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road, Ningbo 315201, China ) , Chen, Xiang (Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road, Ningbo 315201, China ) , Zhang, Bingsen (Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China ) , Wang, Lei (Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road, Ningbo 315201, China ) , Zhang, Jian (Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road, Ningbo 315201, China)
    Carbon v.132 ,pp. 8 - 15 , 2018 , 0008-6223 ,

    초록

    Abstract Although graphene has emerged as a promising candidate for constructing a high-performance supercapacitor electrode, its electrochemical performance has been restricted by the irreversible layer-restacking or aggregation. Here we report that a simple solid-phase pyrolysis approach to fabricate 3D highly porous and self-supporting graphene sheets under the assistance of thermal sensitive amidinourea phosphate served as the inserting and sacrificing template. The as-synthesized 3D graphene architecture features with ultralight, fire-resistant, heteroatoms incorporated and hierarchically porous characteristics as well as other specific properties, being a very promising metal-free material for various applications. Employing as an electrode material in supercapacitor, the 3D architecture combines wrinkled graphene layers, hierarchical interlayer pores, and defects or vacancies in graphene sheets, are very beneficial to resist layer stacking, minimize ions diffusion resistance and enhance intrinsic capacitance. By introducing phosphorus sacrificing template, the product delivered an approximate 2.7 folds higher specific capacitance with faster ionic and electronic transport than that of the counterpart synthesized without phosphorus participation. Graphical abstract [DISPLAY OMISSION]

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  4. [해외논문]   High capacitance and energy density supercapacitor based on biomass-derived activated carbons with reduced graphene oxide binder   SCI SCIE

    Choi, Ji-Hyuk (Resources Utilization Research Center, Korea Institute of Geoscience and Mineral Resources, Daejeon, 34132, South Korea ) , Lee, Chongmin (Department of Nanomaterials Science and Engineering, University of Science & Technology, Daejeon, 34132, South Korea ) , Cho, Sungwhan (Department of Mechanical Science and Engineering, University of Illinois at Urbana−Champaign, Urbana, IL 61801, United States ) , Moon, Geon Dae (Dongnam Regional Division, Korea Institute of Industrial Technology, Busan, 46749, South Korea ) , kim, Byung-su (Resources Utilization Research Center, Korea Institute of Geoscience and Mineral Resources, Daejeon, 34132, South Korea ) , Chang, Hankwon (Resources Utilization Research Center, Korea Institute of Geoscience and Mineral Resources, Daejeon, 34132, South Korea ) , Jang, Hee Dong (Resources Utilization Research Center, Korea Institute of Geoscience and Mineral Resources, Daejeon, 34132, South Korea)
    Carbon v.132 ,pp. 16 - 24 , 2018 , 0008-6223 ,

    초록

    Abstract Reduced graphene oxide (RGO) is employed as a conductive binder for the unprecedentedly high performance of the used coffee grounds-derived AC (cAC) supercapacitor. The 2 wt% of RGO sheets in the cAC based electrode (cAC-2) successfully preserves high specific surface area of cAC and supports conductive networks decorated with oxygen groups, which synergistically improve charge storage capability. Furthermore, the wettability of the cAC-2 electrode enhanced by hydrophilic oxygen groups of RGO allows the easy access of the electrolyte to the pores of the electrode. The symmetric two electrode system exhibits outstanding charge storage capacity, reaching a high specific capacitance of 512 F g −1 in KOH electrolyte at 0.5 A g −1 which is nearly four times higher than that of cAC electrode with PVDF binders. Remarkable electrochemical performance is further demonstrated in EMIMTFSI electrolyte, including high specific capacitance of 440 F g −1 at 0.5 A g -1 , with an excellent rate performance of 81.4% from 0.5 to 10 A g -1 . The record high energy density of 187.3 Wh kg −1 is achieved at a power density of 438 W kg −1 and maintains an energy density of 153.8 Wh kg −1 at 8750 W kg −1 in EMIMTFSI electrolyte. Graphical abstract Novel-green electrode composed of biomass-derived activated carbons and RGO sheets as a binder was fabricated for ultrahigh performance supercapacitors. [DISPLAY OMISSION]

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  5. [해외논문]   Proximity effect induced spin filtering and gap opening in graphene by half-metallic monolayer Cr2C ferromagnet   SCI SCIE

    Zhou, Baozeng (Tianjin Key Laboratory of Film Electronic & Communicate Devices, School of Electrical and Electronic Engineering, Tianjin University of Technology, Tianjin, 300384, China ) , Ji, Shiwen (Tianjin Key Laboratory of Film Electronic & Communicate Devices, School of Electrical and Electronic Engineering, Tianjin University of Technology, Tianjin, 300384, China ) , Tian, Zhen (Tianjin Key Laboratory of Film Electronic & Communicate Devices, School of Electrical and Electronic Engineering, Tianjin University of Technology, Tianjin, 300384, China ) , Cheng, Weijia (Tianjin Key Laboratory of Film Electronic & Communicate Devices, School of Electrical and Electronic Engineering, Tianjin University of Technology, Tianjin, 300384, China ) , Wang, Xiaocha (Tianjin Key Laboratory of Film Electronic & Communicate Devices, School of Electrical and Electronic Engineering, Tianjin University of Technology, Tianjin, 300384, China ) , Mi, Wenbo (Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology, School of Science, Tianjin University, Tianjin,)
    Carbon v.132 ,pp. 25 - 31 , 2018 , 0008-6223 ,

    초록

    Abstract The idea of spin injection into graphene by proximity effect is an interesting and timely topic. Furthermore, using 2D materials to induce such an effect instead of bulk materials is a recent targeted route towards better solution for 2D spintronics. We report on first-principle calculations of the spin-dependent properties in graphene induced by its interaction with a nearby half-metallic Cr 2 C (2D MXene). Spin polarization can be induced in graphene by the interfacial proximity of half-metallic Cr 2 C ferromagnet. The average spin polarization in the graphene can reach to 74%, which is much larger than the graphene/magnetic metal or graphene/magnetic insulator heterostructures. The observed spin splitting comes from the interaction between C- p z and Cr-3 d states. Except for a n -doped feature by charge transfer, the linear dispersion of Dirac cone is modified with a band gap opening of 80 meV between the bonding and antibonding states. Especially, the electronic structure, charge transfer and gap opening are shown to depend strongly on the graphene/Cr 2 C interlayer, which can be tailored by strain. Moreover, a strain modulated spin filter based on the graphene/Cr 2 C heterostructure has been proposed. These results strongly revive this novel system as a candidate for future graphene-based spintronic devices. Graphical abstract A strain modulated spin filter based on the graphene/Cr2C heterostructure. It is possible to control the doping concentration and spin polarization in graphene by applying a vertical strain field. [DISPLAY OMISSION]

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  6. [해외논문]   Highly flexible and ultra-thin Ni-plated carbon-fabric/polycarbonate film for enhanced electromagnetic interference shielding   SCI SCIE

    Xing, Di (School of Mechanical & Automotive Engineering, South China University of Technology, 381#Wushan Road, Guangzhou, 510641, China ) , Lu, Longsheng (School of Mechanical & Automotive Engineering, South China University of Technology, 381#Wushan Road, Guangzhou, 510641, China ) , Teh, Kwok Siong (School of Engineering, San Francisco State University, San Francisco, CA, 94132, United States ) , Wan, Zhenping (School of Mechanical & Automotive Engineering, South China University of Technology, 381#Wushan Road, Guangzhou, 510641, China ) , Xie, Yingxi (School of Mechanical & Automotive Engineering, South China University of Technology, 381#Wushan Road, Guangzhou, 510641, China ) , Tang, Yong (School of Mechanical & Automotive Engineering, South China University of Technology, 381#Wushan Road, Guangzhou, 510641, China)
    Carbon v.132 ,pp. 32 - 41 , 2018 , 0008-6223 ,

    초록

    Abstract We report in this work a highly flexible, mechanically robust, and ultra-thin Ni-plated nonwoven carbon fabric/polycarbonate (CF/PC/Ni) film that exhibits outstanding electromagnetic interface (EMI) shielding performance. This composite film is fabricated through a four-step process — fabrication of nonwoven carbon fiber/polypropylene/polyethylene (CEF-NF) fabric, catalytic seeding and sensitization, electroless Ni plating, and lamination with polycarbonate. The as-fabricated ultra-thin (0.31 mm) CF/PC/Ni film exhibits superior EMI shielding effectiveness (EMI-SE) of 72.7 dB, which is close to 3× that of an identical film with no Ni plating (25 dB)—demonstrating Ni plating can substantially improve the EMI shielding performance. Compared with similar lightweight EMI-shielding materials, this CF/PC/Ni film shows a superior EMI-SE at lower density and smaller thickness (1376.1 dB cm 2 g −1 ). 40 min of Ni plating (yielding a Ni thickness of 1.075 μm), followed by 2 MPa of laminating pressure at 190 °C of laminating temperature were found to provide optimal EMI shielding performance. Based on reliability study, the CF/PC/Ni film retains 96.36% of its EMI-SE after 5000 cycles of mechanical bending and 50 h of heating. Therefore, the CF/PC/Ni film exhibits outstanding flexibility, good mechanical strength, and remarkable electrical properties, making it an excellent EMI shielding material. Highlights A Ni-plated carbon-fabric/polycarbonate film shows excellent EMI shielding property at lower weight and thickness.. A laminating parameter making this film exhibit optimal EMI shielding performance were determined. This film exhibits outstanding EMI shielding effectiveness and good mechanical strength. The electrical conductivity of this film increases as Ni layer thickness increases. This film exhibits excellent mechanical and thermal reliability after bending and heating tests. Graphical abstract [DISPLAY OMISSION]

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  7. [해외논문]   Mechanisms and applications of carbon nanotubes in terahertz devices: A review   SCI SCIE

    Wang, Ruiqian (College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China ) , Xie, Lijuan (College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China ) , Hameed, Saima (College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China ) , Wang, Chen (College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China ) , Ying, Yibin (College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China)
    Carbon v.132 ,pp. 42 - 58 , 2018 , 0008-6223 ,

    초록

    Abstract Terahertz (THz) technology has been widely utilized in fields of multiple disciplines because of its unique properties such as broadband and directivity. With existing and emerging technologies increasing demand for compact, fast and broadband terahertz devices, high-performance THz devices are becoming indispensable. Carbon nanotubes (CNTs) with superior optical and electronic performance have prompted intense research and significant advances, paving the way for realistic applications. In this review, we introduce the mechanisms of utilizing carbon nanotubes to generate, modulate, polarize, and detect terahertz radiation. We also discuss recent carbon nanotube terahertz devices based on these mechanisms, including THz antennae, emitters, amplifiers, transistors, polarizers, and1 detectors. Furthermore, the main performance achievement for such devices is summarized briefly, and an outlook on the performance improvement for existing deficiencies is presented. Graphical abstract [DISPLAY OMISSION]

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  8. [해외논문]   The mechanics of energy dissipation in a three-dimensional graphene foam with macroporous architecture   SCI SCIE

    Nautiyal, Pranjal (Corresponding author.) , Boesl, Benjamin , Agarwal, Arvind
    Carbon v.132 ,pp. 59 - 64 , 2018 , 0008-6223 ,

    초록

    Abstract The three-dimensional porous architecture of graphene foam combines extraordinary mechanical properties of graphene with a unique structural organization to produce a strong, lightweight material. In this study, mechanisms for energy dissipation in graphene foam are investigated by localized nano-scale dynamic mechanical testing. Mechanical response of the material subjected to cyclic loading-unloading is captured as loss tangent (tan δ), characterizing the energy dissipation. Indentation tips with different geometries and dimensions (from 100 nm to 100 μm) are employed, which translate into variable stress-states with mechanical stresses ranging from a few kilo-Pascals to a few giga-Pascals. Formation of dynamic ripples, flattening of intrinsic corrugations, kink band formation, inter-layer van der Waals spring-like action, and membrane vibration are proposed as the key energy dissipation mechanisms in graphene foam. The relative contribution of these mechanisms towards energy dissipation is compared and quantified, with tan δ values varying from about 0.1 to 0.45. The energy dissipation behavior of the material is found to be highly stable, as the loss tangent values are retained for as high as 50,000 cycles. The fundamental understanding of intrinsic mechanics will enable engineering of impact-tolerable foam structure with desirable and predictable mechanical performance. Graphical abstract [DISPLAY OMISSION]

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  9. [해외논문]   Graphene nanoribbon transistors with high ION/IOFF ratio and mobility   SCI SCIE

    Jangid, Poonam (Corresponding author.) , Pathan, Dawuth , Kottantharayil, Anil
    Carbon v.132 ,pp. 65 - 70 , 2018 , 0008-6223 ,

    초록

    Abstract We report the realization of graphene nanoribbon (GNR) transistors with I ON /I OFF ratio of 2 × 10 7 and electron and hole mobilities of 400 cm 2 /V.s and 1100 cm 2 /V.s respectively at 6 K. The nanoribbons were fabricated by Pt catalyzed etching of mechanically exfoliated graphene in hydrogen ambient. The performance parameters obtained are some of the best values ever reported. The high performance indicates the highly smooth edges along crystallographic directions in GNR obtained by the catalytic etching process. Graphical abstract [DISPLAY OMISSION]

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  10. [해외논문]   Performance enhancement effects of dispersed graphene oxide sponge nanofillers on the liquid electrolytes of dye-sensitized solar cells   SCI SCIE

    Venkatesan, Shanmuganathan (Department of Chemical Engineering, National Cheng Kung University, No.1 University Road, Tainan, 70101, Taiwan ) , Darlim, Elmer Surya (Department of Chemical Engineering, National Cheng Kung University, No.1 University Road, Tainan, 70101, Taiwan ) , Liu, I-Ping (Department of Chemical Engineering, National Cheng Kung University, No.1 University Road, Tainan, 70101, Taiwan ) , Lee, Yuh-Lang (Department of Chemical Engineering, National Cheng Kung University, No.1 University Road, Tainan, 70101, Taiwan)
    Carbon v.132 ,pp. 71 - 77 , 2018 , 0008-6223 ,

    초록

    Abstract A graphene oxide sponge (GOS) is prepared and utilized as a nanofiller (NF) of an iodide liquid electrolyte for dye-sensitized solar cell (DSSC) application. The concentration effects of the GOS NFs on the conductivity of the electrolyte, and the performance of the DSSCs are studied. The results indicate that the inclusion of GOS NFs markedly enhances the conductivity of the liquid electrolyte. The electrochemical impendence spectroscopy (EIS) analysis shows that the presence of GOS NFs may increase the recombination resistance (R ct ) at the photoelectrode/electrolyte interface and, furthermore, decreases the charge transfer resistance at the Pt counter electrode/electrolyte interface (R pt ). Therefore, the current density (J sc ), open circuit potential (V oc ), and fill factor (FF) of the DSSCs can be improved by controlling the concentration of GOS NFs. In this study, the DSSC with 0.50 wt% GOS NFs can achieve the highest energy conversion efficiency of 9.44%, which is higher than that obtained for the corresponding cell without GOS NFs (8.84%). Graphical abstract [DISPLAY OMISSION]

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    Fig. 1 이미지

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