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Facile synthesis and characterization of a novel thiophene-fused polycyclic aromatics based on pyrene

Chinese Chemical Letters 2011年第7期22卷 819-822页

作者： Daiki Hoshino Tsuyoshi Morita yasushiro nishioka College of Science and Technology Nihon UniversityNarashinodaiFunabashiChiba 2748501Japan

A novel large thiophene-fused polycyclic aromatics 1 based on pyrene 5 has been synthesized, and its structure was confirmed by ^1H NMR, ^13C NMR, MS, UV-vis and elemental analysis. The key steps of the synthesis involved the Stille cross-coupling reaction and followed by selective β-β oxidative cyclization of pendant thienyl rings by FeCl3 under mild conditions.

关键词： Pyrene Thiophene Stille coupling reaction Oxidative cyclization

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Influence of oxygen exposure on instabilities of perfluoropentacene transistor characteristics with different gate insulators

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Progress in Natural Science:Materials International 2011年第1期21卷 12-16页

作者： Hideharu UEKI Hiroaki YANO Hirokuni OHUCHI Yutaro TAKAYANAGI yasushiro nishioka Department of Precision Machinery College of Science and TechnologyNihon UniversityChiba 274-8501Japan

Pentacene for p-channel organic field effect transistors（OTFTs） and perfluoropentacene for n-channel OTFTs have attracted strong attentions to be used as CMOS type organic semiconductor materials for flexible organic displays.n-channel OTFTs with different gate insulators of polyimide（PI） and SiO2and perfluoropentacene as a semiconductor layer were fabricated,and their instability of the transistor characteristics measured in air,vacuum and oxygen was *** results show that both of the transistors exhibit a significant increase of mobility when measured in ***,the mobility of the transistors is significantly reduced when measured in pure oxygen,and the threshold voltages continuously *** phenomena may be related to water diffusion into the perfluoropentacene/gate insulator interface in air and oxidation of perfluoropentacene in oxygen.

关键词： oxygen exposure OTFT perfluoropentacene gate insulator polyimide SiO2

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Ion-Conductive-Polymer-Film Actuators with Pt Electrodes Selectively Grown using Non-Electrolyzed Plating

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Journal of Chemistry and Chemical Engineering 2011年第6期5卷 558-565页

作者： Kohei Oguma yasushiro nishioka Department of Precision Machinery Engineering College of Science and Technology Nihon University 7-24-1 Narashinodai Funabashi-shi Chiba 274-8501 Japan Research Center for Micro-Functional Devices Nihon University 7-24-1 Narashinodai Funabashi-shi Chiba 274-8501 Japan

Organic soft actuators are of special interest in many fields including intravascular neurosurgery. Ion conductive polymer film （ICPF） actuators have been one of the strong candidates. The ICPF investigated here was a cation-exchange membrane （Nation 117, Du Pont）. When a voltage is given between the metal eIectrodes of an ICPF actuator, the ICPF actuator bends in the water due to the motion of Li＋ cations with associated water. In order to increase the freedom of the deformation of the ICPF actuator, structures of independent electrode pairs were proposed. The electrodes were selectively deposited by non-electrokvzed plating including the Pt [（NH3）6]^4＋ deposition process in a [Pt（NH3）6]Cl4 solution and the reduction process in a NaBH4 solution. Here, an elastomer adhesive tape with a fine electrode patterns was used performances were reported in detail. as a mask. The actuators processing conditions and their actuator

关键词： ICPF Soft actuator Pt electrode non-electrolyzed plating.

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A Transparent Polyimide Film as a Biological Cell Culture Sheet with Microstructures

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Journal of Biomaterials and Nanobiotechnology 2014年第1期5卷 17-23页

作者： Hirotaka Maenosono Hirofumi Saito yasushiro nishioka Department of Precision Machinery College of Science and Technology Nihon University Chiba Japan

The research on stem cell cultures has attracted much attention due to the recent development of regenerative medicine. Therefore, higher functionalities for devices used for culturing cells are strongly demanded. In this study, we fabricated cell culture sheets using transparent polyimide (PI), parylene (PA), and polyetheretherketone (PEEK) to make polymer materials that had microstructures. We then cultured stromal marrow cells (OP9) on them and investigated the cell alignment within the microstructures. Hot embossing was used to fabricate the microstructures with a width and depth of 5 μm on the polymer substrates. Cultivation of the cells was confirmed on the transparent PI and PA sheets, however, it was not observed on the PEEK sheet. Slight alignment of the cells was also observed along with the microstructures.

关键词： Transparent Polymide Parylene Polyetheretherketone OP9 Cell Hot Embossing

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Behaviors of Polypyrrole Soft Actuators in LiTFSI or NaCl Electrolyte Solutions Containing Methanol

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Journal of Materials Science and Chemical Engineering 2013年第4期1卷 1-7页

作者： Tetsuya Kadoyama Jun Yamasaki Futo Tsumuji Satoshi Takamiya Shou Ogihara Daiki Hoshino yasushiro nishioka Department of Precision Machinery College of Science & Technology Nihon University Chiba Japan

Organic soft linear actuators were fabricated using galvanostatic electropolymerization of the polypyrrole (PPy) thin film using a methyl benzoate electrolyte solution of N,N-Diethyl-N-methyl-N-(2-methoxyethyl) ammonium bis (trifluoromethanesulfonyl) imide. The electrochemical deformation behaviors of the PPy actuators were investigated in aqueous solutions of an electrolyte, lithium bis (trifluoromethanesulphonyl) imide (LiTFSI) or sodium chloride (NaCl), containing different concentrations of methanol. The actuating strain of approximately 9% was achieved when the actuator was driven by a potential between –1 and 1 V with the potential sweep rate of 10 mV/s corresponding to 0.0025 Hz in the LiTFSI electrolyte containing 40% to 50% of methanol under a load stress of 0.3 MPa. However, the PPy actuator could not catch up with the higher frequency. On the other hand, the PPy actuator caught up with the potential sweep up to 0.1 Hz in the NaCl solutions with a methanol concentration between 40% and 60% with the expense of the actuating strain to approximately 1%.

关键词： Soft Actuator Polypyrrole LiTFSI NaCl

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Characteristics of Gamma-Ray Irradiated Pentacene Organic Thin Film Field Effect Transistors

Characteristics of Gamma-Ray Irradiated Pentacene Organic Th...

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The 1st International Congress on Advanced Materials 2011

作者： HIROAKI YANO LI CAI TOSHIO HIRAO ZONGFAN DUAN YUTARO TAKAYANAGI HIROKUNI OHUCHI HIDEHARU UEKI TAKESHI OHSHIMA yasushiro nishioka Department of Precision Machinery College of Science and TechnologyNihon University Japan Atomic Energy Agency

P-channel pentacene field effect transistors with a Si/SiO 2 /pentacene/Au structure were fabricated, and were gamma-ray irradiated with a Co 60 source. The changes of the drain current I D vs. source/drain voltage V SD (I D - V SD ) characteristics were measured after every 200 Gy in silicon (Gy Si ) irradiations up to the total dose of 1200 Gy Si . The drain current I D continuously decreased to less than 10 % of that before irradiation after 1200 Gy Si irradiation. The threshold voltage V th continuously decreased up to 800 Gy Si , started to saturate above 800 Gy Si, and recovered above 1000 Gy Si . The mobility μ continued to decrease up to 1200 Gy Si . Those behaviors were explained by accumulation of positive trapped charge within the gate insulator SiO 2 near the interface, continuous increase of interface traps near the interface between the SiO 2 and pentacene, and build up of electrons in the channel regions. These behaviors were discussed in comparisons with previously reported results on ultraviolet (UV) light irradiation experiments on similarly structured pentacene-based transistors.

关键词： Co60 gamma-ray radiation damage pentacene SiO2 OTFT UV-light

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