研究者詳細 - 林　靖彦

論文 - 林　靖彦

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In Vitro Evaluation of Cytotoxicity and Oxidative Stress Induced by Multiwalled Carbon Nanotubes in Murine RAW 264.7 Macrophages and Human A549 Lung Cells 査読

Chen Bo, Liu Ying, Song Wei Ming, Yasuhiko Hayashi, Ding Xun Cheng, Li Wei Hua

BIOMEDICAL AND ENVIRONMENTAL SCIENCES 24 ( 6 ) 593 - 601 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：CHINESE CENTER DISEASE CONTROL & PREVENTION

Objective To investigate in vitro cytotoxicity and oxidative stress response induced by multiwalled carbon nanotubes (MWCNTs).
Methods Cultured macrophages (murine RAW264.7 cells) and alveolar epithelium cells type II (human A549 lung cells) were exposed to the blank control, DNA salt control, and the MWCNTs suspensions at 2.5, 10, 25, and 100 mu g/mL for 24 h. Each treatment was evaluated by cell viability, cytotoxicity and oxidative stress.
Results Overall, both cell lines had similar patterns in response to the cytotoxicity and oxidative stress of MWCNTs. DNA salt treatment showed no change compared to the blank control. In both cell lines, significant changes at the doses of 25 and 100 mu g/mL treatments were found in cell viabilities, cytotoxicity, and oxidative stress indexes. The reactive oxygen species (ROS) generation was also found to be significantly higher at the dose of 10 mu g/mL treatment, whereas no change was seen in most of the indexes. The ROS generation in both cell lines went up in minutes, reached the climax within an hour and faded down after several hours.
Conclusion Exposure to MWCNTs resulted in a dose-dependent cytotoxicity in cultured RAW264.7 cells and A549 cells, that was closely correlated to the increased oxidative stress.

DOI： 10.3967/0895-3988.2011.06.002

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

Determination of Young's modulus of carbon nanofiber probes fabricated by the argon ion bombardment of carbon coated silicon cantilever 査読

Kazuhisa Inaba, Kouji Saida, Pradip Ghosh, Ken Matsubara, Munisamy Subramanian, Akari Hayashi, Yasuhiko Hayashi, Masaki Tanemura, Masashi Kitazawa, Ryo Ohta

CARBON 49 ( 13 ) 4191 - 4196 2011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：PERGAMON-ELSEVIER SCIENCE LTD

A single amorphous carbon nanofiber (CNF) was grown on a commercial Si cantilever by the argon ion (Ar+) bombardment of carbon coated silicon cantilever. The CNF probe was mounted on a piezo controlled arm opposing a soft cantilever to measure the axial force acting on the CNF in a scanning electron microscope (SEM). The buckling force was measured while observing the buckling behavior. The CNF probes have an elliptical cross section with short and long axis of 20-29 and 25-59 nm, respectively, and a length of 350-760 nm. The Young's modulus was determined from Euler's formula using the measured buckling force and had a value of 38-48 GPa, almost independent of the CNF size. The Young's modulus was lower than that of high quality carbon nanotubes (CNTs) and higher than that of defective CNTs. It was also demonstrated that the CNF probes were elastic, similar to the CNT probes. Thus CNF probes produced by Ar+ ion bombardment are quite promising as practical nanocarbon probes. (C) 2011 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.carbon.2011.05.051

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

Fabrication of Ge nanoneedles by ion-irradiation method 査読

Ako Miyawaki, M. Zamri, T. Hayashi, Y. Hayashi, M. Tanemura, T. Tokunaga

SURFACE & COATINGS TECHNOLOGY 206 ( 5 ) 812 - 815 2011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：ELSEVIER SCIENCE SA

The Ge surfaces irradiated by Ar(+) ions at 600 eV with simultaneous Ni supply at room temperature were characterized by various kind of densely distributed nanostructures, such as tiny cones, nanorods with a bottlenecked and nanoneedles, depending on the Ni supply rate during Ar(+) ion irradiation. As the Ni supply rate decreased, the width of nanostructure formed on the cone tip became thin, and finally slender Ge nanoneedles of 60-80 nm in diameter and 100-300 nm in length were realized. Because the simultaneously supplied Ni fulfills the prerequisite for the so-called "seed" which enhances the surface texturing, size of clustered Ni atoms during of Ar(+) ion irradiation might affect the size of nanostructures formed after the prolonged sputtering. (C) 2011 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.surfcoat.2011.04.022

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

Morphology control of a rapidly grown vertically aligned carbon-nanotube forest for fiber spinning 査読

T. Iijima, H. Oshima, Y. Hayashi, U. B. Suryavanshi, A. Hayashi, M. Tanemura

PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE 208 ( 10 ) 2332 - 2334 2011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：WILEY-BLACKWELL

Carbon nanotube (CNT) fibers have interesting applications because of their good electrical and mechanical properties. CNT fiber is fabricated in a simple way, that it is spun from a vertically aligned CNT forest (VACNF). Spinning occurs by joining of CNT when the CNT at the edge of a VACNF is drawn horizontally. However, the mechanism of spinning is still not clear. To investigate it, we fabricated a spinnable VACNF by thermal chemical vapor deposition (CVD) and compared it with unspinnable VACNF by scanning electron microscope (SEM) observation and polarized Raman spectroscopy. It was found that there were a few big differences between spinnable and unspinnable VACNFs. In the case of spinnable VACNF, most of the CNTs are straight and well aligned. Spinnable VACNF also contains CNT bundles consisting of 8-10 CNTs that are not vertically aligned. This CNT bundle was shared by a few adjacent thicker CNT bundles. These points are very important for continuous fiber spinning. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

DOI： 10.1002/pssa.201084170

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

High-resolution imaging of plasmid DNA in liquids in dynamic mode atomic force microscopy using a carbon nanofiber tip 査読

Masashi Kitazawa, Shuichi Ito, Akira Yagi, Nobuaki Sakai, Yoshitugu Uekusa, Ryo Ohta, Kazuhisa Inaba, Akari Hayashi, Yasuhiko Hayashi, Masaki Tanemura

Japanese Journal of Applied Physics 50 ( 8 ) 08LB14 2011年8月

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）

To understand the motion of DNA and DNA complexes, the real-time visualization of living DNA in liquids is quite important. Here, we report the high-resolution imaging of plasmid DNA in water using a rapid-scan atomic force microscopy (AFM) system equipped with a carbon nanofiber (CNF) probe. To achieve a rapid high-resolution scan, small SiN cantilevers with dimensions of 2 (width) × 0.1 (thickness) × 9μm (length) and a bent end (tip view structure) were employed as base cantilevers onto which single CNFs were grown. The resonant frequencies of the cantilever were 1.5 MHz in air and 500 kHz in water, and the spring constant was calculated to be 0.1 N/m. Single CNFs, typically 88 nm in length, were formed on an array of the cantilevers in a batch process by the ion-irradiation method. An AFM image of a plasmid DNA taken in water at 0.2fps (5s/image) using a batch-fabricated CNF-tipped cantilever clearly showed the helix turns of the double strand DNA. The average helical pitch measured 3.4 nm (σ: 0.5 nm), which was in good agreement with that determined by the X-ray diffraction method, 3.4 nm. Thus, it is presumed that the combined use of the rapid-scan AFM system with the ion-induced CNF probe is promising for the dynamic analysis of biomolecules. © 2011 The Japan Society of Applied Physics.

DOI： 10.1143/JJAP.50.08LB14

High-Resolution Imaging of Plasmid DNA in Liquids in Dynamic Mode Atomic Force Microscopy Using a Carbon Nanofiber Tip 査読

Masashi Kitazawa, Shuichi Ito, Akira Yagi, Nobuaki Sakai, Yoshitugu Uekusa, Ryo Ohta, Kazuhisa Inaba, Akari Hayashi, Yasuhiko Hayashi, Masaki Tanemura

JAPANESE JOURNAL OF APPLIED PHYSICS 50 ( 8 ) 2011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：IOP PUBLISHING LTD

To understand the motion of DNA and DNA complexes, the real-time visualization of living DNA in liquids is quite important. Here, we report the high-resolution imaging of plasmid DNA in water using a rapid-scan atomic force microscopy (AFM) system equipped with a carbon nanofiber (CNF) probe. To achieve a rapid high-resolution scan, small SiN cantilevers with dimensions of 2 (width) x 0.1 (thickness) x 9 mu m (length) and a bent end (tip view structure) were employed as base cantilevers onto which single CNFs were grown. The resonant frequencies of the cantilever were 1.5 MHz in air and 500 kHz in water, and the spring constant was calculated to be 0.1 N/m. Single CNFs, typically 88 nm in length, were formed on an array of the cantilevers in a batch process by the ion-irradiation method. An AFM image of a plasmid DNA taken in water at 0.2 fps (5 s/image) using a batch-fabricated CNF-tipped cantilever clearly showed the helix turns of the double strand DNA. The average helical pitch measured 3.4nm (sigma:0.5 nm), which was in good agreement with that determined by the X-ray diffraction method, 3.4 nm. Thus, it is presumed that the combined use of the rapid-scan AFM system with the ion-induced CNF probe is promising for the dynamic analysis of biomolecules. (C) 2011 The Japan Society of Applied Physics

DOI： 10.1143/JJAP.50.08LB14

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

Mohd Zamri, Pradip Ghosh, Akari Hayashi, Yasuhiko Hayashi, Masaki Tanemura, Masato Sasase

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B 29 ( 4 ) 2011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：A V S AMER INST PHYSICS

A graphite foil was irradiated with argon (Ar+) ions to fabricate conical structures with a carbon nanofiber (CNF) on top of the structure. The field emission (FE) properties of one-dimensional individual CNF-tipped cones that had been fabricated were carefully measured by in situ transmission electron microscopy (TEM) facilities. The highest FE current, 550 nA, was observed in the current-voltage (I-V) measurement of a single CNF. Almost no degradation in I-V properties were detected during the reliability test after 30 min. TEM images indicated that the CNF was amorphous in nature initially, and that the electron current flow in the FE process induced the dramatic change in the crystalline structure of both the CNF and of the tip region of the basal cone part. After performing the FE process, the crystalline structures of the amorphous CNFs were transformed into ring-shaped graphene layers, whereas nanodiamond like nanoparticles formed in the outer layer of the tip region of the basal cone. The structural changes induced can be attributed to Joule heating under the high electric field. (C) 2011 American Vacuum Society. [DOI: 10.1116/1.3591420]

DOI： 10.1116/1.3591420

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

Growth evolution of rapid grown aligned carbon nanotube forests without water vapor on Fe/Al2O3/SiO2/Si substrate 査読

Yasuhiko Hayashi, Toru Iijima, M. Miyake, M. Satoh, N. L. Rupesinghe, K. B. K. Teo, M. Tanmemura

DIAMOND AND RELATED MATERIALS 20 ( 7 ) 859 - 862 2011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：ELSEVIER SCIENCE SA

This paper presents the growth evolutions in terms of the structure, growth direction and density of rapid grown carbon nanotube (CNT) forests observed by scanning and transmission electron microcopies (SEM/TEM). A thermal CVD system at around 700 degrees C was used with a catalyst of Fe films deposited on thin alumina (Al2O3) supporting layers, a very fast raising time to the growth temperature below 25 degrees C/s, and a carbon source gas of acetylene diluted with hydrogen and nitrogen without water vapor. Activity of Fe catalyst nanoparticles was maintained for 5 min during CVD process, and it results in CNT forests with heights up to 0.6 mm. SEM images suggest that the disorder in CNT alignment at the initial stage of CM's plays a critical role in the formation of continuous CNT growth. Also, the prolonged heating process leads to increased disorder in CNT alignment that may be due to the oxidation process occurring at the Fe nanoparticles. TEM images revealed that both double- and few-walled CNTs with diameters of 5-7 nm were obtained and the CNT density was controlled by thickness of Fe catalytic layer. The number of experiments at the same conditions showed a very good repeatability and reproducibility of rapid grown CNT forests. (C) 2011 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.diamond.2011.02.003

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

Gas separation properties of functionalized carbon nanotubes mixed matrix membranes 査読

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

SEPARATION AND PURIFICATION TECHNOLOGY 78 ( 2 ) 208 - 213 2011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 BV

The synergistic combinations of organic polymers for separation applications with inorganic substances such as multi-walled carbon nanotubes (MWNTs), have resulted in a new class of membrane material called mixed matrix membrane (MMM) for the separation of CO2/CH4 gases. Mixed matrix membrane incorporated functionalized MWNTs (f-MWNTs) were fabricated by the solution casting method, in which the 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 was investigated. The mixed matrix membranes showed 100% enhancement for the selectivity of CO2/CH4 compared to the corresponding neat polymer membrane. This new class of mixed matrix membrane has the ability to separate gases at the molecular level and has the potential to ultimately reduce the energy consumed in present-day separation operations. This study has shown that addition of CNTs to polymeric membranes has improved separation properties of the membranes to a certain extent. (C) 2011 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.seppur.2011.02.003

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

Azidation of polyesters having pendent functionalities by using NaN3 or DPPA-DBU and photo-crosslinking of the azidopolyesters 査読

Yosuke Shibata, Hiroki Tanaka, Akinori Takasu, Yasuhiko Hayashi

POLYMER JOURNAL 43 ( 3 ) 272 - 278 2011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：NATURE PUBLISHING GROUP

In this article, we performed dehydration polycondensation of bromosuccinic acid and methylsuccinic acid with 1,4- butanediol at 80 1C to synthesize aliphatic polyesters containing pendent bromo groups without dehydrobromination using scandium trifluoromethanesulfonate (Sc(OTf) 3) as the catalyst. Azidation of the resultant polyesters was carried out readily in N, Ndimethylformamide at room temperature using sodium azide (M-n = 8.3 x 10(3) (M-w/M-n=2.17)). H-1 nuclear magnetic resonance analysis of the product revealed that 65% contained azide functionality, and dehydrobromination occurred in 35% during the azidation process. On the other hand, azidation of poly(butylene bromoadipate-co-butylene methylsuccinate) (poly(BBA-co-BMS)) proceeded successfully under the same conditions to generate poly(butylene azidoadipate-co-butylene methylsuccinate) (poly(BAA-co-BMS)) without dehydrobromination (M-n=10.4 x 10(3) (M-w/M-n=2.71)). We successfully photo-crosslinked the resultant azidopolyester by ultraviolet irradiation and examined it using scanning electron microscope. We also described azidation of polyesters having pendent hydroxyl groups by using the 'DPPA (diphenylphosphoryl azide)-DBU (1,8diazabicyclo[5.4.0] undec-7-ene) substitution strategy' to produce water-soluble polyesters containing pendent azido groups (M-n=7.5 +/- 103 (M-w/M-n=2.25)). These azidopolyesters might be extremely useful not only for their derivatization by simple chemical modification but also for their effective utilization as photolithography material. Polymer Journal (2011) 43, 272-278; doi: 10.1038/pj.2010.135; published online 12 January 2011

DOI： 10.1038/pj.2010.135

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

Formation of carbon nanostructures containing single-crystalline cobalt carbides by ion irradiation method 査読

Zhipeng Wang, Zamri Yusop, Pradip Ghosh, Yasuhiko Hayashi, Masaki Tanemura

APPLIED SURFACE SCIENCE 257 ( 8 ) 3168 - 3173 2011年2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

Carbon nanofibers (CNFs) with a diameter of 17 nm, and carbon nanoneedles (CNNs) with sharp tips have been synthesized on graphite substrates by ion irradiation of argon ions with the Co supplies rate of 1 and 3.4 nm/min, respectively. Energy dispersive X-ray spectrometry, combined with selected area electron diffraction patterns has been used to identify the chemical composition and crystallinity of these carbon nanostructures. The CNFs were found to be amorphous in nature, while the structures of the CNNs consisted of cubic CoC(x), orthorhombic Co(2)C and Co(3)C depending on the cobalt content in the CNNs. The diameter of the carbide crystals was almost as large as the diameter of the CNN. Compared to the ion-induced nickel carbides and iron carbides, the formation of single-crystalline cobalt carbides might be due to the high temperature produced by the irradiation. (C) 2010 Elsevier B. V. All rights reserved.

DOI： 10.1016/j.apsusc.2010.10.134

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

In-situ TEM observation of internal metal inside metal filled carbon fiber 査読

Tomoharu Tokunaga, Yoshiro Horita, Takumi Kanematsu, Ikuo Nomura, Toru Iijima, Yasuhiko Hayashi, Kotaro Kuroda

DIAMOND AND RELATED MATERIALS 20 ( 2 ) 210 - 212 2011年2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

There has been a considerable amount of research on MFCNTs and MFCNFs; however, research on the behavior of the internal metal used in MFCNF under heating has been limited. Therefore, in this study, an MFCNF was heated and the behavior of the internal metal was investigated using in-situ TEM observations. The internal metal used in the MFCNF did not melt. It was supposed that the non-melting was because of the high pressure of the internal metal resulting from a difference in the coefficients of linear thermal expansion of the graphite wall of the MFCNF and the internal metal. The pressure of the internal metal was calculated; it was approximately 12 GPa when the MFCNF was heated at 1500 degrees C. (C) 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.diamond.2010.12.005

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

Morphology and Size of Ion Induced Carbon Nanofibers: Effect of Ion Incidence Angle, Sputtering Rate, and Temperature 査読

Mohd Zamri Yusop, Kohei Yamaguchi, Takahito Suzuki, Pradip Ghosh, Akari Hayashi, Yasuhiko Hayashi, Masaki Tanemura

JAPANESE JOURNAL OF APPLIED PHYSICS 50 ( 1 ) 2011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：JAPAN SOC APPLIED PHYSICS

Graphite surfaces were bombarded with oblique Ar+ ions at 1 keV to induce the carbon nanofiber (CNF) growth at room temperature and at high temperature (300 degrees C), and their dependence of length, diameter and number density on ion-incidence angle and sputtering rate was investigated in detail. The sputtered surface ion-irradiated at normal incidence produced huge cones and rod-like structures. It was found that some of the cones possessed the non-aligned thick carbon fibers on the top. By contrast, obliquely ion-irradiation induced the formation of densely distributed CNF-tipped cones. The higher ion-incidence angle produced CNF of smaller diameter and high fabrication temperature favors the formation of longer fiber with higher numerical density. In addition, the number density of the CNF-tipped cones strongly depended upon the ion-incidence angle rather than the sputtering rate. Thus, the diameter, length and number density of CNFs were strongly dependent upon the ion-irradiation parameters. It is believed that myriad of applications is possible with ion-induced CNFs by selecting the suitable ion-irradiation parameters. (C) 2011 The Japan Society of Applied Physics

DOI： 10.1143/JJAP.50.01AF10

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

Growth and structure analysis of tungsten oxide nanorods using environmental transmission electron microscopy 査読

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

Proceedings - International NanoElectronics Conference, INEC 2011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 WO3 nanorods were fabricated in environmental transmission electron microscopy (ETEM) by simply heating it in oxygen atmosphere. Altough, WO3 nanorod showed high crystalline, but the stacking fault existed in nanorod. Furthermore, the nanorod was grown on tungsten wire through slit of oxide layer on it. © 2011 IEEE.

DOI： 10.1109/INEC.2011.5991617

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

Highly transparent and flexible field emission devices based on single-walled carbon nanotube films 査読

Debasish Ghosh, Pradip Ghosh, Masaki Tanemura, Akari Haysahi, Yasuhiko Hayashi, Kawasaki Shinji, Noboru Miura, Mohd Zamri Yusop, Toru Asaka

CHEMICAL COMMUNICATIONS 47 ( 17 ) 4980 - 4982 2011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

Single-walled carbon nanotubes (SWNTs) have been used successfully to fabricate highly transparent and flexible field emission displays (FEDs). Field emission measurements indicated that SWNTs films have great potential to work as building blocks for next generation transparent and flexible FEDs.

DOI： 10.1039/c0cc05677d

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

Direct fabrication of aligned metal composite carbon nanofibers on copper substrate at room temperature and their field emission property 査読

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

CHEMICAL COMMUNICATIONS 47 ( 16 ) 4820 - 4822 2011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

Direct growth of aligned metal composite carbon nanofibers (MCNFs) was achieved by a highly reproducible room temperature growth process on cost effective electrically conductive copper (Cu) substrate without any catalyst. The direct fabrication of MCNFs on electrically conductive substrate might offer new perspectives in the field of field emission displays (FEDs).

DOI： 10.1039/c1cc10655d

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

Electrical property of carbon nanotube Fiber spun from vertically aligned carbon nanotube forest 査読

T. Iijima, Y. Hayashi, U. B. Suryavanshi, A. Hayashi, M. Tanemura, H. Oshima

Proceedings - International NanoElectronics Conference, INEC 2011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）

Carbon nanotube (CNT) fibers are having interesting applications because of its good electrical and mechanical properties. CNT fiber is fabricated by simple way that it is spun from vertically aligned CNT forest (VACNF). Spinning is occurred by joining of CNT when the CNT at edge of VACNF is drawn horizontally. © 2011 IEEE.

DOI： 10.1109/INEC.2011.5991734

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

Simple methods for tuning the pore diameter of mesoporous carbon 査読

Ulka B. Suryavanshi, Toru Ijima, Akari Hayashi, Yasuhiko Hayashi, Masaki Tanemura

CHEMICAL COMMUNICATIONS 47 ( 38 ) 10758 - 10760 2011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

The organic-organic self-assembly method with Resorcinol (R)/Formaldehyde (F) and Pluronic F127 has been employed to synthesize mesoporous carbon (MC). The pore diameter of the MC has been tuned from 7 to 12.5 nm by changing the molar ratio of carbon sources to surfactant and polymerization time.

DOI： 10.1039/c1cc13471j

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

Influence of new fullerene derivatives with fluorocarbon substituent on performance of polymer solar cells 査読

Ichiko Yamada, Manoj Pandey, Yasuhiko Hayashi, Norio Shibata, Tesuo Soga, Takeshi Toru

9TH INTERNATIONAL CONFERENCE ON NANO-MOLECULAR ELECTRONICS 14 192 - 197 2011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：ELSEVIER SCIENCE BV

We report the polymer solar cells using newly synthesized fullerene derivatives with fluorocarbon substituent (F-PCBM). F-PCBMs were synthesized to improve a solar cell property byadding them to P3HT/PCBM mixture. According to the UV-vis absorption spectra and the cyclic voltammograms for F-PCBMs, the energy levels of the F-PCBMs couldn't be influenced by fluorocarbon substituent. We fabricated the polymer solar cells consist of P3HT/PCBM with each F-PCBM, and investigated their solar cell property. Some solar cells with F-PCBM showed increase of the short circuit current density (J(sc)). F-PCBM with short fluorocarbon chain (PCB2F) significantly increased J(sc), and it showed higher solar cell efficiency (E-ff = 2.31 %) than the solar cell with only PCBM (E-ff = 2.04 %). We also fabricated solar cells with PCB2F on the three condition of drying time before thermal annealing. As a result, the condition of "30 min" showed the highest solar cell efficiency than other tried one. (C) 2010 Published by Elsevier B.V.

DOI： 10.1016/j.phpro.2011.05.039

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

The growth and characterization of Zn nanowires covered with ZnO using plasma-assisted molecular beam irradiation 査読

T. Tokunaga, K. Sasaki, K. Kuroda, T. Iijima, B. Jang, Y. Hayashi, R. A. Afre, M. Tanemura

Proceedings - International NanoElectronics Conference, INEC 2011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 Zn nanowires covered with ZnO were grown by oxygen plasma-assisted molecular beam irradiation method and characterized, was reported. To grow these nanowires, oxygen plasma was irradiated to Zn thin film evaporated on Si(100) substrate. Scanning electron microscopy and transmission electron microscopy observation results of nanowires revealed that the nanowire has diameter of 80 nm, and nanowires was constructed with crystalline ZnO. Moreover NWs surface was covered by crystalline ZnO. Further Zn and ZnO orientation was coincident and resulted the ZnO appeared by oxidation of Zn nanowires. © 2011 IEEE.

DOI： 10.1109/INEC.2011.5991618

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

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