研究者詳細 - 林　靖彦

論文 - 林　靖彦

分割表示 262 件中 141 - 160 件目／全件表示 >>

Poly[(3-hexylthiophene)-block-(3-semifluoroalkylthiophene)] for Polymer Solar Cells 査読

Ichiko Yamada, Koji Takagi, Yasuhiko Hayashi, Tetsuo Soga, Norio Shibata, Takeshi Toru

INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES 11 ( 12 ) 5028 - 5040 2010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：MDPI AG

We report the synthesis of poly[(3-hexylthiophene)-block-(3-(4,4,5,5,6,6,7,7,7-nonafluoroheptyl)thiophene)], P(3HT-b-3SFT), carried out by the Grignard Metathesis Method (GRIM). The copolymers composition was determined by H-1 and F-19 NMR spectroscopies, and gel permeation chromatography (GPC). The thin films of P(3HT-b-3SFT) were investigated by ultraviolet-visible absorption spectroscopy and atomic force microscopy (AFM). We also fabricated bulk-hetero junction (BHJ) solar cells based on blends of P(3HT-b-3SFT) and [6,6]-phenyl-C-61-butyric acid methyl ester (PCBM). Although the composition ratio of P3SFT in P(3HT-b-3SFT) was low, the influence of P3SFT on the morphology and properties of solar cells was significant. The annealing process for the BHJ solar cells induced the formation of large domains and led to poor solar cell performance. The BHJ solar cells, based on PCBM and P(3HT-b-3SFT), prepared by the non-annealing process, had a maximum power conversion efficiency of 0.84% under 100 mW/cm(2) (AM 1.5 solar illumination) in air.

DOI： 10.3390/ijms11125027

Synthesis and magnetic property of Fe-incorporated carbon nanofibers by ion-irradiation method 査読

Z. P. Wang, M. Zamri, T. Hihara, Y. Hayashi, M. Tanemura

Transactions of the Materials Research Society of Japan 35 ( 4 ) 755 - 758 2010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：The Materials Research Society of Japan

The Fe-incorporated carbon nanofibers (Fe-CNFs) grew on the graphite plate surface irradiated by Ar⁺ ions with a simultaneous Fe supply. The average diameter and length of the Fe-CNFs were in the range of 10-50 nm and 0.5-3 μm, respectively. As confirmed by TEM observation, the Fe-CNFs thus grown were characterized by amorphous-like or very fine crystalline nature. Compared with bulk Fe, they possessed higher coercivities for both parallel and perpendicular directions to the substrate at room temperature. In addition, magnetic properties of the Fe-CNFs strongly depended on the Fe content: The higher the Fe content, the stronger the saturation magnetization, whereas perpendicular coercivity was obtained for lower Fe supply rates.

DOI： 10.14723/tmrsj.35.755

Fabrication and Morphological Control of Ion-Induced Zinc Nanostructures 査読

Pradip Ghosh, Masaki Kutsuna, Masato Kudo, Akari Hayashi, Yasuhiko Hayashi, Masaki Tanemura

JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 10 ( 10 ) 6677 - 6682 2010年10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

An efficient method for the fabrication of zinc (Zn) nanostructures (nanoneedles and nanofibers) of controllable density and morphology without any catalyst, hazardous chemicals or external heat supply has been investigated. By varying the ion irradiation time and the ion current density, morphological control and the density of Zn nanostructures were successfully achieved using a fast and viable ion irradiation technique. Scanning (SEM) and transmission electron microscopy (TEM) results revealed that the sputtered surface was almost entirely covered with densely distributed conical and needle-like protrusions with linear shaped (sometimes curved) nanostructures (such as nanoneedles and nanofibers) with diameters and lengths of about 20-50 nm and several hundred nanometers, respectively. Detailed analysis of selected area electron diffraction (SAED) patterns with TEM analysis indicates that the Zn nanofibers were polycrystalline in nature. A possible mechanism of the formation of Zn nanostructures is briefly discussed. These aligned arrays of Zn nanoneedles/nanofibers could be a promising material for the fabrication of zinc oxide nanostructures by subsequent oxidation of Zn nanostructures and their future application in nanodevices. Thus, it is believed that this ion irradiation technique could open up a new approach for the fabrication of many kinds of nanomaterials of controllable density.

DOI： 10.1166/jnn.2010.2508

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

Template-free electrochemical nanofabrication of polyaniline nanobrush and hybrid polyaniline with carbon nanohorns for supercapacitors 査読

Di Wei, Haolan Wang, Pritesh Hiralal, Piers Andrew, Tapani Ryhaenen, Yasuhiko Hayashi, Gehan A. J. Amaratunga

NANOTECHNOLOGY 21 ( 43 ) 2010年10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

Polyaniline (PANI) nanobrushes were synthesized by template-free electrochemical galvanostatic methods. When the same method was applied to the carbon nanohorn (CNH) solution containing aniline monomers, a hybrid nanostructure containing PANI and CNHs was enabled after electropolymerization. This is the first report on the template-free method to make PANI nanobrushes and homogeneous hybrid soft matter (PANI) with carbon nanoparticles. Raman spectroscopy was used to analyze the interaction between CNH and PANI. Electrochemical nanofabrication offers simplicity and good control when used to make electronic devices. Both of these materials were applied in supercapacitors and an improvement capacitive current by using the hybrid material was observed.

DOI： 10.1088/0957-4484/21/43/435702

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

Electron spin resonance (ESR) analysis of Cu-doped ZnO and AlN films 査読

Fan-Yong Ran, M. Subramanian, Masaki Tanemura, Yasuhiko Hayashi, Takehiko Hihara

PHYSICA B-CONDENSED MATTER 405 ( 18 ) 3952 - 3954 2010年9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 BV

Cu-doped ZnO and AlN films both exhibiting room-temperature (RT) ferromagnetism (FM) were deposited by helicon magnetron sputtering. Magnetic anisotropy was observed for all the films; saturated magnetization was larger under the applied field perpendicular to the sample surface than the [0 0 0 2] direction. Electron spin resonance (ESR) analysis showed that spins tended to align in a perpendicular direction to the surface, which might account for the observed magnetic anisotropy. (C) 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physb.2010.06.036

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

New approach to breast tumor detection based on fluorescence x-ray analysis | Neues verfahren zum nachweis von brustkrebs auf der basis der röntgen-fluoreszenz-analyse 査読

Hayashi Y, Okuyama F

GMS German Medical Science 8 2010年8月

Size Control of Carbon Nanofiber Probes Fabricated by Ion Irradiation 査読

Kazuhisa Inaba, Yoshitaka Sugita, Takahito Suzuki, Masaki Tanemura, Akari Hayashi, Yasuhiko Hayashi, Masashi Kitazawa, Ryo Ohta

JAPANESE JOURNAL OF APPLIED PHYSICS 49 ( 8 ) 2010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：JAPAN SOC APPLIED PHYSICS

The effect of ion species and fabrication temperature on the size of ion-induced carbon nanofibers (CNFs) grown on tips of scanning probe microscope cantilevers was investigated in detail. Similarly to that using Ar(+) ions, the fabrication of CNF probes using Ne(+) and Xe(+) ions was possible. Xe(+) sputtering yielded the shortest CNF probes owing to its large sputtering effect; however, a significant difference in the size of the CNF probes between Ne(+) and Ar(+) ion irradiation was not observed. The CNFs increased in length with fabrication temperature owing to the enhanced diffusion of C atoms at elevated temperatures; however, the CNF diameter remained almost constant independent of fabrication temperature. Therefore, the fabrication at elevated temperatures was effective for the rapid fabrication of practical CNF probes. Thus, the CNF probe size was controllable by adjusting the fabrication temperature and ion species. (C) 2010 The Japan Society of Applied Physics

DOI： 10.1143/JJAP.49.08LB15

Formation and growth mechanisms of ion-induced iron-carbon nanocomposites at room temperature 査読

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

APPLIED SURFACE SCIENCE 256 ( 21 ) 6371 - 6374 2010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：ELSEVIER SCIENCE BV

The irradiation of graphite surfaces with a simultaneous Fe supply have resulted into the development of various types of carbon nanocomposites. Their morphologies - diameter, density, length and apex angle strongly depend on the ratios of Fe deposition rate (D(Fe)) to ion sputtering rate (S(ion)). By optimizing the ratio of D(Fe)/S(ion) (2.40%), the denser and well-aligned Fe-carbon nanocomposite fibers (Fe-CNFs) could be obtained, whose average length and diameter were 0.95 mu m and 17 nm, respectively. As confirmed by energy-dispersive X-ray analysis, the Fe-CNFs with amorphous-like or fine-polycrystalline phase were surely composed of carbon and Fe. Two types of growth models have been employed to explain the formation of metal-carbon nanocomposites. (C) 2010 Elsevier B. V. All rights reserved.

DOI： 10.1016/j.apsusc.2010.04.019

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

PREPARATION AND CHARACTERISTICS OF FUNCTIONALIZED MULTIWALLED CARBON NANOTUBES IN POLYIMIDE MIXED MATRIX MEMBRANE 査読

S. M. Sanip, A. F. Ismail, P. S. Goh, B. C. Ng, M. S. Abdullah, T. Soga, M. Tanemura, H. Yasuhiko

NANO 5 ( 4 ) 195 - 202 2010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：WORLD SCIENTIFIC PUBL CO PTE LTD

The functionalization of multiwalled carbon nanotubes (MWNTs) with beta cyclodextrin (beta-CD) is described. The functionalization using beta-CD treatment is an environmentally friendly and nondestructive method to modify carbon nanotubes. It was observed that the degree of functionalization increases with increasing ratios of beta-CD as seen from the Raman analysis. The Raman spectra also indicated that the nanotubes walls were not damaged. The presence of functional groups associated with beta-CD on the functionalized MWNTs indicated that the cyclodextrin groups were found to be adsorbed at the surface of the nanotubes walls. Mixed matrix membrane (MMM) was prepared by a phase inversion process. Enhanced selectivity and permeability for CO(2) over CH(4) was observed for MMM prepared using functionalized MWNTs.

DOI： 10.1142/S1793292010002104

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

Crystallinity-controlled iron-carbon composite nanofibers-Synthesis and characteristic properties 査読

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

JOURNAL OF CRYSTAL GROWTH 312 ( 12-13 ) 1935 - 1939 2010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：ELSEVIER SCIENCE BV

Aligned Fe-carbon composite nonofibers (Fe-CNFs) grew on graphite substrates bombarded by Ar+ ions at an oblique incident angle with a simultaneous Fe supply at room temperature. Morphology alteration and crystallinity variation of Fe-CNFs were achieved by adjusting the supply rate of Fe atoms. The effects of different Fe concentrations on the morphological and crystalline structures of Fe-CNFs were discussed in detail. The higher the Fe supply rates, the higher the Fe concentration in Fe-CNFs. Higher Fe concentration in Fe-CNFs favors the graphitization of carbon materials, but destroys the directivity of Fe-CNFs pointing to ion beam incident direction. The magnetic properties of Fe-CNFs with different Fe contents were also analyzed in detail. (C) 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jcrysgro.2010.03.023

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

Improved open circuit voltage of the photovoltaic device using ferrocene as a donor material 査読

Rakesh A. Afre, Yasuhiko Hayashi, Tetsuo Soga

SYNTHETIC METALS 160 ( 7-8 ) 779 - 782 2010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

In this work, we have studied the combination of ferrocene (Fc), the donor material and fullerene derivatives such as [6,6]-phenyl C(61)-butyric acid methyl ester (PCBM) and the acceptor material, for fabricating organic photovoltaic devices. The effect of temperature on open circuit voltage (V(oc)), short-circuit current density (J(sc)), fill factor (FF) and the photoconversion efficiency (PCE), eta has been investigated. By varying the annealing temperature, the V(oc) FF and PCE, eta, were increased up to 140 degrees C and further increasing of temperature it remains constant. However, the short-circuit current density was not varied concomitantly with other parameters. The maximum PCE was observed to be 0.053% at 140 degrees C, which is the best annealing temperature in the present study. There have been many attempts to synthesize Fc and fullerene dyads but as an application wise very few report are available. Therefore here we have tried to use Fc and PCBM for photovoltaic device applications. (C) 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.synthmet.2010.01.020

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

Transparent and Flexible Field Electron Emitters Based on the Conical Nanocarbon Structures 査読

Pradip Ghosh, M. Zamri Yusop, Syunsaku Satoh, Munisamy Subramanian, Akari Hayashi, Yasuhiko Hayashi, Masaki Tanemura

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 132 ( 12 ) 4034 - + 2010年3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

The fabrication of conical nanocarbon structures (CNCSs) on a transparent and flexible nafion substrate at room temperature using an ion irradiation technique and their application toward field emission displays (FEDs) have been demonstrated. The main advantage of this technique is that CNCSs can be fabricated directly on the transparent substrate while retaining the transparency of the substrate. A scanning electron microscopy (SEM) image revealed that the sputtered surface was entirely covered with CNCSs with a calculated numerical density of 6 x 10(6)/mm(2). Such nafion based CNCSs have proved to be an effective electron emitter with turn-on and threshold fields of 6.1 and 9.5 V/mu m, respectively. The field enhancement factor was estimated to be 1020 from the Fowler-Nordheim (F-N) plot. Thus the room temperature fabricated CNCSs based on transparent and flexible nafion substrate would be very promising for future flexible (roll-up) and transparent FEDs.

DOI： 10.1021/ja909346e

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

Direct growth of carbon nanofibers on metal mesh substrates by ion irradiation method 査読

M. Zamri, Pradip Ghosh, Z. P. Wang, M. Kawagishi, A. Hayashi, Y. Hayashi, M. Tanemura

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B 28 ( 2 ) C2C9 - C2C12 2010年3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：A V S AMER INST PHYSICS

A direct growth of carbon nanofibers (CNFs) on the metal meshes by an ion irradiation method has been demonstrated. The average diameter and length of CNFs were found to be 50 nm and 2.0 mu m for Cu meshes, and 20 nm and 1.0 mu m for Mo meshes, respectively. Scanning electron microcopy images revealed that sputtering time and metal species of meshes influenced the morphology of the obtained nanofibers. High resolution transmission electron microscopy images indicated that the nanofibers were metal-composite CNFs in which the very fine metal crystallites dispersed in the amorphous carbon matrix. It was also demonstrated that the amorphous based structure changed to nanowires covered with graphene layers after the current flow in the composite CNFs.

DOI： 10.1116/1.3318694

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

Low-Temperature Fabrication and Characterization of Ion-Induced Ge Nanostructures 査読

A. Miyawaki, T. Hayashi, P. Ghosh, M. Tanemura, Y. Hayashi, T. Tokunaga

INEC: 2010 3RD INTERNATIONAL NANOELECTRONICS CONFERENCE, VOLS 1 AND 2 398 - + 2010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

Ge surfaces were irradiated by Ar+ ions at 600 eV with and without a simultaneous supply of Ge, Au or Al at room temperature. The surfaces ion-irradiated without any simultaneous metal supply were characterized by densely distributed conical protrusions. By contrast, various kinds of nanostructures were formed on the Ge surfaces ion-irradiated with a simultaneous metal supply. They featured cones and nanobelts with a flattened top for Ge supply cases, whereas they were characterized by nanorods for Au supply cases and by nanorods, nanobelts and nanowalls for Al supply cases. Very interestingly, the nanorods formed with Au or Al supply possessed a bottleneck structure. Thus, the ion-induced Ge nanostructures were controllable in morphology by species and amount of simultaneously supplied metals.

DOI： 10.1109/INEC.2010.5424518

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

Structural change of ion-induced carbon nanofibers by electron current flow 査読

M. Zamri Yusop, Pradip Ghosh, Masato Sasase, Akari Hayashi, Yasuhiko Hayashi, Masaki Tanemura

Proceedings - 2010 8th International Vacuum Electron Sources Conference and Nanocarbon, IVESC 2010 and NANOcarbon 2010 43 - 44 2010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）

1-dimensional (1-D) nanocarbon materials such as carbon nanotubes [1] (CNTs) and carbon nanofibers (CNFs) are quite promising as electron emission sources[2] in the near future. These 1-D nanocarbon materials possess very high aspect ratio, thus readily allowing to emit electrons under relatively low applied electric fields even at low vacuum pressures. During the field emission (FE) process, degradation in current and structural damages of the nanocarbon emitters often occurs. Regarding these phenomena, for the practical use it is essential to fully understand the fundamental physics underlying the FE process particularly for individual nanocarbon emitters. In this paper, we are challenging to study the structural change of individual ion-induced CNF by electron current flow during FE process, using in situ transmission electron microscopy (TEM) facilities. © 2010 IEEE.

DOI： 10.1109/IVESC.2010.5644429

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

Formation and characterization of C<inf>60</inf>- and perylene-based bulk heterojunction solar cells 査読

Oku, T., Suzuki, A., Kikuchi, K., Kakuta, N., Motoyoshi, R., Nomura, K., Kawashima, A., Hayashi, Y., Soga, T.

Thin-Film Solar Cells 179 - 192 2010年

Growth and structure analysis of tungsten oxide nanorods using environmental TEM 査読

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

Proceedings - 2010 8th International Vacuum Electron Sources Conference and Nanocarbon, IVESC 2010 and NANOcarbon 2010 278 - 279 2010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）

The metal oxide nanorods are widely studied, as the electronic characteristics of the metal oxide nanorods are different from the electronic characteristics of bulk metal oxide. [1-3] Tungsten oxide nanorods are one of the metal oxide semiconductors can be easily made. Therefore considering its semiconducting properties it is applied for electrical devices. But the growth mechanism of the tungsten oxide nanorods is not clarified yet, and growth control of tungsten oxide nanorods is not succeeded. Then, the tungsten oxide nanorods growth process was observed by Environmental transmission electron microscope (ETEM) observation, and the growth mechanism was examined. © 2010 IEEE.

DOI： 10.1109/IVESC.2010.5644241

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, Yasuhiko Hayashi, Masaki Tanemura

INEC: 2010 3RD INTERNATIONAL NANOELECTRONICS CONFERENCE, VOLS 1 AND 2 77 - 78 2010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

Graphite surfaces were irradiated by Ar+ ions at 1 keV with a simultaneous Co supply at room temperature. Various kinds of carbon nanocomposites, such as nanocones with and without nanofibers (NFs) on top, nanorods and bean-like nanoprotrusions, formed depending on Co supply rates. The NFs, -1.5 mu m in average length, grew on the top of the nanocones at Co supply rate of 1.0 nm/min, and with increasing the Co supply rate the formation of nanoprotrusions without NFs became prominent. As confirmed by energy-dispersive X-ray analysis, NFs and nanoprotrusions were surely composed of C and Co.

DOI： 10.1109/INEC.2010.5424534

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

Fabrication of well ordered Zn nanorod arrays by ion irradiation method at room temperature and effect on crystal orientations 査読

Masaki Kutsuna, Pradip Ghosh, Masato Kudo, Masaki Tanemura, Yasuhiko Hayashi

INEC: 2010 3RD INTERNATIONAL NANOELECTRONICS CONFERENCE, VOLS 1 AND 2 436 - 437 2010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

Highly oriented and densely packed one dimensional (ID) polycrystalline Zn nanorods were fabricated on zinc plate without any catalyst at room temperature by bombardment with obliquely incident Ar(+) ion via ion irradiation method. The sputtered surfaces were fully covered with Zn nanostructures with diameter and the length around 60 nm and 1.3 mu m, respectively, confirmed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The numerical density of Zn nanostructures (nanoneedle or nanorods) was found to be 2.1 x 10(6) to 9 x 10(6)/mm(2) depends upon the crystal orientation and the atomic density on different crystallographic faces. The outstanding feature of this growth technique is that it provides a new direction for the controllable growth of desired nanostructures of variable density at room temperature without any catalyst. These well-aligned arrays of Zn nanorods/nanoneedle might be a promising material for the future application in nanodevices.

DOI： 10.1109/INEC.2010.5424501

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

New approach to breast tumor detection based on fluorescence x-ray analysis. 査読

Hayashi, Y., Okuyama, F.

German medical science : GMS e-journal 8 2010年

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