研究者詳細 - 林　靖彦

論文 - 林　靖彦

分割表示 262 件中 101 - 120 件目／全件表示 >>

Structural and Electrical Properties of Ozone Irradiated Carbon Nanotube Yarns and Sheets 査読

Toru Iijima, Yasuhiro Inagaki, Hisayoshi Oshima, Takuya Iwata, Ryota Sato, Golap Kalita, Toru Kuzumaki, Yasuhiko Hayashi, Masaki Tanemura

MATERIALS EXPRESS 2 ( 4 ) 357 - 362 2012年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER SCIENTIFIC PUBLISHERS

Poor electrical conductivity of carbon nanotube (CNT) yarn and sheets has been one of the main hurdles in their practical application. Here, we demonstrate that the ozone irradiation can be an effective approach to reduce the resistivity of spun CNTs bundle with oxidization and induced defects. The CNT yarn and sheet are fabricated from a spinnable vertically aligned CNT forest synthesized by a thermal chemical vapor deposition. The electrical resistance of a CNT yarn and sheet reduces with a certain period of ozone irradiation; however for a long duration of ozone irradiation resistance increases with structural deformation of the CNTs. A comparative study on the effect of shapes between the CNT yarn and sheet with morphological change in the CNTs due to the ozone irradiation is performed. It was observed that the desorption energy of ozone molecules was slightly large for the CNT yarn due to the difference of adsorption sites. The fraction of defects induced by the ozone irradiated on the CNT yarn was estimated from the ultimate resistance change with temperature and Raman spectroscopy.

DOI： 10.1166/mex.2012.1092

その他リンク： http://orcid.org/0000-0002-4113-5548

Synthesis of graphene by surface wave plasma chemical vapor deposition from camphor 査読

Golap Kalita, Subash Sharma, Koichi Wakita, Masayoshi Umeno, Yasuhiko Hayashi, Masaki Tanemura

PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE 209 ( 12 ) 2510 - 2513 2012年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：WILEY-V C H VERLAG GMBH

We demonstrate synthesis of graphene using the solid precursor camphor in a microwave excited surface wave plasma chemical vapor deposition technique. Highly sublimely camphor was introduced into the plasma chamber in the vapor phase along with Ar and uniform plasma formation was obtained. Rapid deposition of a graphene film on Cu foil was achieved at a relatively low temperature (<600 degrees C). Raman spectroscopy and transmission electron microscopy clearly showed that the deposited film on Cu foil consist of few-layer graphene. Fully flexible transparent electrode was fabricated by transferring the graphene film with excellent properties for device application. (C) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

DOI： 10.1002/pssa.201228554

その他リンク： http://orcid.org/0000-0002-4113-5548

Pre-treatment of multi-walled carbon nanotubes for polyetherimide mixed matrix hollow fiber membranes 査読

P. S. Goh, B. C. Ng, A. F. Ismail, M. Aziz, Y. Hayashi

JOURNAL OF COLLOID AND INTERFACE SCIENCE 386 ( 1 ) 80 - 87 2012年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ACADEMIC PRESS INC ELSEVIER SCIENCE

Mixed matrix hollow fibers composed of multi-walled carbon nanotubes (MWCNTs) and polyetherimide (PEI) were fabricated. Pre-treatment of MWCNTs was carried out prior to the incorporation into the polymer matrix using a simple and feasible two stages approach that involved dry air oxidation and surfactant dispersion. The characterizations of the surface treated MWCNTs using TEM and Raman spectroscopy have evidenced the effectiveness of dry air oxidation in eliminating undesired amorphous carbon and metal catalyst while surfactant dispersion using Triton X100 has suppressed the agglomeration of MWCNTs. The resultant mixed matrix hollow fibers were applied for O-2/N-2 pure gas separation. Interestingly, it was found that removal of disordered amorphous carbons and metal particles has allowed the hollow structures to be more accessible for the fast and smooth transport of gas molecules, hence resulted in noticeable improvement in the gas separation properties. The composite hollow fibers embedded with the surface modified MWCNTs showed increase in permeability as much as 60% while maintaining the selectivity of the O-2/N-2 gas pair. This study highlights the necessity to establish an appropriate pre-treatment approach for MWCNTs in order to fully utilize the beneficial transport properties of this material in mixed matrix polymer nanocomposite for gas separation. (c) 2012 Elsevier Inc. All rights reserved.

DOI： 10.1016/j.jcis.2012.07.033

その他リンク： http://orcid.org/0000-0002-4113-5548

In Situ TEM Observation of Fe-Included Carbon Nanofiber: Evolution of Structural and Electrical Properties in Field Emission Process 査読

Mohd Zamri Mohd Yusop, Pradip Ghosh, Yazid Yaakob, Golap Kalita, Masato Sasase, Yasuhiko Hayashi, Masaki Tanemura

ACS NANO 6 ( 11 ) 9567 - 9573 2012年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC

In situ transmission electron microscopy (TEM) of single Fe-Included carbon nanofibers (CNFs) revealed that the fine polycrystalline structure in the shank region of CNFs transformed to graphitic, hollow structures during a field emission (FE) process. The iron metal platelets agglomerated during the FE process and perceptibly were emitted from the shank, which featured bamboo-like carbon nanotube (CNT) structures. The structural evolution also improved the electrical properties, and the FE current was remarkably increased, that is, 1000 times higher than the initial value (from 10(-9) to 10(-6) A). The structural transformations were effectuated by Joule heating that generated simultaneously during the FE process The in situ TEM study of room-temperature-synthesized CNFs could provide essential information regarding CNFs structural.. transformation for their possible application in future electron emitter sources.

DOI： 10.1021/nn302889e

その他リンク： http://orcid.org/0000-0002-4113-5548

High temperature in-situ observations of multi-segmented metal nanowires encapsulated within carbon nanotubes by in-situ filling technique 査読

Yasuhiko Hayashi, Tomoharu Tokunaga, Toru Iijima, Takuya Iwata, Golap Kalita, Masaki Tanemura, Katsuhiro Sasaki, Kotaro Kuroda

NANOSCALE RESEARCH LETTERS 7 1 - 4 2012年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SPRINGER

Multi-segmented one-dimensional metal nanowires were encapsulated within carbon nanotubes (CNTs) through in-situ filling technique during plasma-enhanced chemical vapor deposition process. Transmission electron microscopy (TEM) and environmental TEM were employed to characterize the as-prepared sample at room temperature and high temperature. The selected area electron diffractions revealed that the Pd4Si nanowire and face-centered-cubic Co nanowire on top of the Pd nanowire were encapsulated within the bottom and tip parts of the multiwall CNT, respectively. Although the strain-induced deformation of graphite walls was observed, the solid-state phases of Pd4Si and Co-Pd remain even at above their expected melting temperatures and up to 1,550 +/- 50A degrees C. Finally, the encapsulated metals were melted and flowed out from the tip of the CNT after 2 h at the same temperature due to the increase of internal pressure of the CNT.

DOI： 10.1186/1556-276X-7-448

その他リンク： http://orcid.org/0000-0002-4113-5548

Transparent and flexible field emission display device based on single-walled carbon nanotubes 査読

Debasish Ghosh, Pradip Ghosh, Mohd Zamri Yusop, Masaki Tanemura, Yasuhiko Hayashi, Tetsuo Tsuchiya, Tomohiko Nakajima

PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS 6 ( 7 ) 303 - 305 2012年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：WILEY-V C H VERLAG GMBH

A fully transparent and flexible field emission device (FED) has been demonstrated. Single-walled carbon nanotubes (SWCNTs) coated on arylite substrate were used as electron emitters for the FED and a novel metavanadate phosphor coated on the SWCNTs/arylite film was used as transparent and flexible screen. The SWCNTs/arylite based emitters and the SWCNTs/arylite/metal-vanadate-based phosphor showed a transmittance value of 92.6% and 54%, respectively. The assembled device also showed satisfactory transparency and flexibility as well as producing significant current. Metavanadate phosphor is considered to be an excellent candidate due to its superior luminescence properties and easy fabrication onto transparent and flexible conductive substrate at room temperature while retaining reasonable transparency of the substrate. Thus, its transparency and flexibility will open the door to next-generation FEDs. ((c) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

DOI： 10.1002/pssr.201206251

その他リンク： http://orcid.org/0000-0002-4113-5548

Effect of defects in ferromagnetic C doped ZnO thin films 査読

Munisamy Subramanian, Yuhei Akaike, Yasuhiko Hayashi, Masaki Tanemura, Hiroshi Ebisu, Daniel Lau Shu Ping

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS 249 ( 6 ) 1254 - 1257 2012年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：WILEY-V C H VERLAG GMBH

The present work investigates the relation between ferromagnetism and intrinsic defects of C-doped ZnO thin films. The room-temperature ferromagnetism (RTFM) in C-doped ZnO is due to the charge transfer between Zn 4s and C 2p orbitals. The long-range magnetic interaction in C-doped ZnO is due to carboncarbon interaction mediated by oxygen. The oxygen- and zinc-related defects in C-doped ZnO affect the mediation of ferromagnetic interaction and the existence of hybridization between Zn and C, respectively.

DOI： 10.1002/pssb.201147609

その他リンク： http://orcid.org/0000-0002-4113-5548

Characterization of carbon nanotube-silver composite yarn 査読

T. Iijima, Y. Inagaki, H. Oshima, T. Iwata, U. B. Suryavanshi, R. Sato, T. Kuzumaki, T. Tokunaga, Y. Hayashi, M. Tanemura

AMTC Letters 3 206 - 207 2012年5月

Fundamental Study on Organic Solar Cells Based on Soluble Zinc Phthalocyanine 査読

Ichiko Yamada, Masashi Umeda, Yasuhiko Hayashi, Tetsuo Soga, Norio Shibata

JAPANESE JOURNAL OF APPLIED PHYSICS 51 ( 4 ) 2012年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：JAPAN SOC APPLIED PHYSICS

We investigated the potential of trifluoroethoxy-coated phthalocyanine [(4TFEO)(4)-ZnPc] as an organic thin-film solar cell material. (4TFEO)(4)-ZnPc dissolves well in several organic solvents, thus a fluorinated phthalocyanine (Pc) thin film can be fabricated by a wet process. Additionally, (4TFEO)(4)-ZnPc has lowest unoccupied molecular orbital (LUMO) energy level close to that of a fullerene derivative owing to the electron-withdrawing effect of fluorine substituents. We fabricated two types of fluorinated Pc solar cells by spin casting "(4TFEO)(4)-ZnPc single-layer solar cells" and "two-layer heterojunction solar cells" consisting of a (4TFEO)(4)-ZnPc layer and a poly(3-hexylthiophene) (P3HT) layer. P3HT is a common donor solar cell material. On the other hand, we used (4TFEO)(4)-ZnPc as an acceptor material. For the single-layer solar cells, the (4TFEO)(4)-ZnPc film acts as the photoactive layer of the solar cells, and P3HT/(4TFEO)(4)-ZnPc solar cell properties were improved as compared with that of P3HT or (4TFEO)(4)-ZnPc single-layer solar cells. Additionally, the photovoltaic properties of these solar cells were significantly improved by annealing treatment. (C) 2012 The Japan Society of Applied Physics

DOI： 10.1143/JJAP.51.04DK09

その他リンク： http://orcid.org/0000-0002-4113-5548

In-situ observation of carbon nanotube fiber spinning from vertically aligned carbon nanotube forest 査読

Toru Iijima, Hisayoshi Oshima, Yasuhiko Hayashi, Ulka Bhimrao Suryavanshi, Akari Hayashi, Masaki Tanemura

DIAMOND AND RELATED MATERIALS 24 158 - 160 2012年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE SA

Single carbon nanotube (CNT) has exceptional electrical and mechanical properties. And CNT fiber is an interesting application because it can become the wire which is more excellent than exiting one. Some groups reported the fabrication of CNT fiber spun from vertically aligned CNTs forest (VACNF), but mechanism of spinning has not clear yet. In this paper, we present the optimum parameters for spinnable VACNF via the difference between spinnable and unspinnable VACNF. (C) 2012 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.diamond.2012.01.002

その他リンク： http://orcid.org/0000-0002-4113-5548

Controllable fabrication and characterization of conical nanocarbon structures on polymer substrate for transparent and flexible field emission displays 査読

Pradip Ghosh, Shunsaku Satou, Takuma Tsuchiya, Yasuhiko Hayashi, Masaki Tanemura

PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS 6 ( 4 ) 184 - 186 2012年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：WILEY-V C H VERLAG GMBH

The direct fabrication of fully transparent conical nanocarbon structures (CNCSs) of controlled nanoscopic dimension on a flexible nafion substrate was achieved, using field electron source, by a novel room temperature ion irradiation technique. By controlling the sizes (below the wavelength of visible light) of the CNCSs, the transparency of the substrate can be tailored satisfactorily. The transparency of the CNCSs was observed to be around 90% in the visible regime depending on the ion irradiation time. Our results suggest that the direct fabrication of well controlled fully transparent CNCSs on any transparent and flexible substrate at room temperature could open a novel route for potential applications in future highly transparent, flexible (bendable), low weight and portable field emission displays (FEDs). (C) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

DOI： 10.1002/pssr.201206037

その他リンク： http://orcid.org/0000-0002-4113-5548

Growth and structure analysis of tungsten oxide nanorods using environmental TEM. 査読国際誌

Tomoharu Tokunaga, Tadashi Kawamoto, Kenta Tanaka, Naohiro Nakamura, Yasuhiko Hayashi, Katsuhiro Sasaki, Kotaro Kuroda, Takahisa Yamamoto

Nanoscale research letters 7 ( 1 ) 85 - 85 2012年1月

記述言語：英語

WO3 nanorods targeted for applications in electric devices were grown from a tungsten wire heated in an oxygen atmosphere inside an environmental transmission electron microscope, which allowed the growth process to be observed to reveal the growth mechanism of the WO3 nanorods. The initial growth of the nanorods did not consist of tungsten oxide but rather crystal tungsten. The formed crystal tungsten nanorods were then oxidized, resulting in the formation of the tungsten oxide nanorods. Furthermore, it is expected that the nanorods grew through cracks in the natural surface oxide layer on the tungsten wire.

DOI： 10.1186/1556-276X-7-85

その他リンク： http://orcid.org/0000-0002-4113-5548

Low-Temperature Fabrication of Germanium Nanostructures by Ion Irradiation: Effect of Supplied Particle Species 査読

Ako Miyawaki, Toshiaki Hayashi, Tomoharu Tokunaga, Akari Hayashi, Yasuhiko Hayashi, Masaki Tanemura

JAPANESE JOURNAL OF APPLIED PHYSICS 51 ( 1 ) 2012年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：IOP PUBLISHING LTD

Germanium (Ge) surfaces were irradiated by argon (Ar) ions at 600 eV with a simultaneous Ge, Al, or Au supply at room temperature. The surfaces thus ion-irradiated were characterized by densely distributed nanowalls, nanobelts (narrower than the nanowalls in width), and cones tipped with nanoribbons (narrower than the nanobelts in width), depending on the supplied particle species and the supply rate. The higher the melting points of the supplied materials, the narrower the width of the top of the nanostructures. Thus the melting point and the supply rate of the supplied material are the key parameters for controlling the shape and size in the fabrication of ion-induced Ge nanostructures. It was also demonstrated that for nanowalls and nanobelts, a higher particle supply rate yielded wider nanostructures. For many nanoribbon-tipped cones, the width of the nanoribbon increased with distance from the cone top, and hence resulted in a bottleneck structure. (C) 2012 The Japan Society of Applied Physics

DOI： 10.1143/JJAP.51.01AB05

その他リンク： http://orcid.org/0000-0002-4113-5548

Fabrication of ZnO nanoparticles confined in the channels of mesoporous carbon 査読

Ulka Suryavanshi, Toru Iijima, Akari Hayashi, Yasuhiko Hayashi, Masaki Tanemura

CHEMICAL ENGINEERING JOURNAL 179 388 - 393 2012年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE SA

ZnO nanoparticles have been incorporated inside the pore system of mesoporous carbon (MC) which has been synthesized by polymerization of resorcinol and formaldehyde via soft templating approach. 5-20% of ZnO, with an interval of 5, have been incorporated almost exclusively within the mesopores by simple wet impregnation, drying and calcination procedures. The pristine MC shows high surface area (600 m(2)/g) with large pore diameter around 7 nm. After impregnation of ZnO in mesopores, the pore diameter has been decreased from 7 to 6.24 nm which may relate to shrinkage of the framework or deposition of ZnO particles on the inner wall of the pores. With the increase in the ZnO percentage, the specific surface area and pore volume decreased linearly confirming the incorporation of nanoparticles inside the mesopores. TGA confirms ZnO confined in the pores of MC which also prevents the collapsing of mesoporous carbon framework upto 325 degrees C. Interestingly, the graphitic nature of MC remains same even after impregnation of ZnO nanoparticles inside the pores. However, we strongly believe that this novel composite of ZnO and MC may play significant role in the application like oxygen reduction reactions. photocatalysis, photovoltaics, optoelectronics, catalysis and many more. (C) 2011 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.cej.2011.10.087

その他リンク： http://orcid.org/0000-0002-4113-5548

Synthesis of transfer-free graphene on an insulating substrate using a solid phase reaction 査読

Ryo Hirano, Ken Matsubara, Golap Kalita, Yasuhiko Hayashi, Masaki Tanemura

NANOSCALE 4 ( 24 ) 7791 - 7796 2012年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ROYAL SOC CHEMISTRY

We demonstrate a solid phase reaction approach to synthesise transfer-free graphene on an insulating substrate by controlling the C diffusion process. Metal assisted crystallization by annealing of a C thin film was carried out to synthesise transfer-free graphene, in the presence of a top metal oxide and metal layer. Without the metal oxide layer, a large amount of C atoms diffused to the top of the metal surface and hence the formation of only small graphene domains was observed on the underneath of the metal layer. Introducing the metal oxide layer at the top surface, C diffusion was reduced and consequently the thin C film was crystallized to form large area graphene at the metal-insulating substrate interface. The metal oxide or metal catalyst layer was removed after graphene formation and transfer-free graphene was obtained directly on the base substrate. This finding shows that the thin metal oxide layer is critical to synthesise graphene with better quality and continuous domain structures.

DOI： 10.1039/c2nr31723k

その他リンク： http://orcid.org/0000-0002-4113-5548

CARBON NANOTUBES BASED MIXED MATRIX MEMBRANE FOR GAS SEPARATION 査読

S. M. Sanip, A. F. Ismail, P. S. Goh, M. N. A. Norrdin, T. Soga, M. Tanemura, H. Yasuhiko

NANOMATERIALS: SYNTHESIS AND CHARACTERIZATION 364 272 - + 2012年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：TRANS TECH PUBLICATIONS LTD

Mixed matrix membranes (MMM) combine useful molecular sieving properties of inorganic fillers with the desirable mechanical and processing properties of polymers. The current trend in polymeric membranes is the incorporation of filler-like nanoparticles to improve the separation performance. Most MMM have shown higher gas permeabilities and improved gas selectivities compared to the corresponding pure polymer membranes. Carbon nanotubes based mixed matrix membrane was prepared by the solution casting method in which the functionalized multiwalled carbon nanotubes (f-MWNTs) were embedded into the polyimide membrane and the resulting membranes were characterized. The effect of nominal MWNTs content between 0.5 and 1.0 wt% on the gas separation properties were looked into. The as-prepared membranes were characterized for their morphology using field emission scanning electron microscopy (FESEM) and Transmission Electron Microscopy (TEM). The morphologies of the MMM also indicated that at 0.7 % loading of f-MWNTs, the structures of the MMM showed uniform finger-like structures which have facilitated the fast gas transport through the polymer matrix. It may also be concluded that addition of open ended and shortened MWNTs to the polymer matrix can improve its permeability by increasing diffusivity through the MWNTs smooth cavity.

DOI： 10.4028/www.scientific.net/AMR.364.272

その他リンク： http://orcid.org/0000-0002-4113-5548

Large-Area CVD Graphene as Transparent Electrode for Efficient Organic Solar Cells 査読

Golap Kalita, Koichi Wakita, Masayoshi Umeno, Yasuhiko Hayashi, Masaki Tanemura

2012 38TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE (PVSC) 3137 - 3141 2012年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：IEEE

Indium tin oxide (ITO) and related oxide based materials have been widely used as transparent electrode in optoelectronic devices and organic solar cells. Here, we demonstrate application of chemical vapor deposited (CVD) graphene films as transparent electrode for organic solar cells. Large area graphene films are deposited by control pyrolysis of botanical derivative camphor (C10H16O) and transparent electrode were fabricated by direct synthesis or transfer process. Raman spectroscopy and transmission electron microcopy studies are used to characterize the synthesized graphene based materials. Direct synthesized and transferred graphene films on glass or plastic substrates show very good optical transparency, electrical conductivity and mechanical stability. P3HT:PCBM bulk heterojunction solar cells are fabricated successfully on graphene based transparent electrode and compared with ITO based device. The dark light characteristic shows very good rectification with minimum leakage current. Under illumination of light the device shows very good open circuit voltage, short circuit current density and conversion efficiency.

DOI： 10.1109/PVSC.2012.6318244

その他リンク： http://orcid.org/0000-0002-4113-5548

Direct Growth of Horizontally Aligned Carbon Nanotubes between Electrodes and Its Application to Field-Effect Transistors 査読

Yasuhiko Hayashi, B. Jang, T. Iijima, T. Tokunaga, A. Hayashi, M. Tanemura, G. A. J. Amaratunga

JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 11 ( 12 ) 11011 - 11014 2011年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER SCIENTIFIC PUBLISHERS

This paper presents direct growth of horizontally-aligned carbon nanotubes (CNTs) between two predefined various inter-spacing up to tens of microns of electrodes (pads) and its use as CNT field-effect transistors (CNT-FETs). Using the conventional photolithography technique followed by thin film evaporation and lift off, the catalytic electrodes (pads) were prepared, consisting of Pt, Al and Fe triple layers on SiO2/Si substrate. The grown CNTs were horizontally-aligned across the catalytic electrodes on the modified gold image furnace hot stage (thermal CVD) at 800 degrees C by using an alcohol vapor as the carbon source. Scanning and transmission electron microcopies (SEM/TEM) were used to observe the structure, growth direction and density of CNTs, while Raman spectrum analysis was used to indicate the degree of amorphous impurity and diameter of CNTs. Both single- and multi-wall CNTs with diameters of 1.1-2.2 nm were obtained and the CNT density was controlled by thickness of Fe catalytic layer. Following horizontally-aligned growth of CNTs, the electrical properties of back-gate CNT-FETs were measured and showd p-type conduction behaviors of FET.

DOI： 10.1166/jnn.2011.3964

その他リンク： http://orcid.org/0000-0002-4113-5548

POLY(3, 4-ETHYLENEDIOXYTHIOPHENE): POLY(STYRENESULFONATE)/SINGLE-WALL CARBON NANOTUBE COMPOSITE FILM FOR THE HOLE TRANSPORT LAYER IN POLYMER SOLAR CELLS 査読

Naoki Kishi, Shinya Kato, Takeshi Saito, Junki Hayashi, Daiki Ito, Yasuhiko Hayashi, Tetsuo Soga, Takashi Jimbo

NANO 6 ( 6 ) 583 - 588 2011年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：WORLD SCIENTIFIC PUBL CO PTE LTD

The composite thin film of poly(3, 4-ethylenedioxythiophene):poly(styrenesulfonate)/single-wall carbon nanotubes (PEDOT:PSS/SWCNTs) for a hole transport layer in polymer solar cells have been explored. PEDOT:PSS/SWCNT composite film exhibited higher electrical conductivity than the control PEDOT:PSS film, suggesting the increase in carrier transport passes through SWCNTs in the hole transport layer. We also demonstrated the improvement of a fill factor and short circuit current density in the polymer solar cells with the hole transport layer of PEDOT:PSS/SWCNT as compared with PEDOT:PSS.

DOI： 10.1142/S1793292011002901

その他リンク： http://orcid.org/0000-0002-4113-5548

Fabrication of Ion-Induced Carbon-Cobalt Nanocomposite Fibers: Effect of Cobalt Supply Rate 査読

Zhipeng Wang, Mohd Zamri Mohd Yusop, Takehiko Hihara, Pradip Ghosh, Akari Hayashi, Yasuhiko Hayashi, Masaki Tanemura

JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 11 ( 12 ) 10677 - 10681 2011年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER SCIENTIFIC PUBLISHERS

Graphite surfaces were irradiated by argon (Ar+) ions at 1 key with a simultaneous cobalt (Co) supply at room temperature. Various kinds of carbon nanocomposites, such as nanocones with and without single nanofibers on their tops, nanorods and fish-scale-like nanoprotrusions, were formed depending on Co supply rates. It has been observed that with increasing the Co supply rate the formation of nanoprotrusions without nanofibers became prominent. Both nanofibers and nanoprotrusions were surely composed of carbon and Co, as confirmed by energy-dispersive X-ray analysis. The cobalt carbon nanocomposite fibers (CCNFs), similar to 1.5 mu m in average length, were grown on the top of the nanocones at the Co supply rate of 1.0 nm/min. The field electron emission characteristics of CCNFs thus grown indicated that there is an optimum parameter for the CCNF growth to achieve the better emission performance than that of pristine Ar+-induced carbon nanofibers.

DOI： 10.1166/jnn.2011.4021

その他リンク： http://orcid.org/0000-0002-4113-5548

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