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Shotaro HAYASHI, Shinsuke INAGI, Toshio FUCHIGAMI
2010 Volume 78 Issue 2 Pages
114-117
Published: February 05, 2010
Released on J-STAGE: March 26, 2012
JOURNAL
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An electroactive polymer, poly[9,9-bis(
p-isopropylphenylsulfanyl)fluorene-
alt-
N-decylcarbazole] (
P2) was prepared. Electrochemical fluorodesulfurization was carried out using a
P2-coated platinum anode. From
1H-NMR, EDX analyses, about 50% fluorodesulfurization at the 9-position of fluorene was confirmed. The UV-vis absorption spectra of the novel donor-acceptor copolymer containing
n-type unit exhibited intramolecular charge transfer (ICT) character.
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Masatoshi SAKAIRI, Yoshihito GOTO, Koji FUSHIMI, Tatsuya KIKUCHI, Hide ...
2010 Volume 78 Issue 2 Pages
118-121
Published: February 05, 2010
Released on J-STAGE: March 26, 2012
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A new method for mask-less fabrication of metal micro-rods is described. The developed solution flow type droplet cell micro fabrication technique was applied to form Cu micro-rods. The use of an inner capillary tube as a mold during electrodeposition, makes it possible to form Cu micro-rods of about 15 mm length and about 100 µm diameter. The length is controlled by the deposition time. From X-ray analysis and surface observations, the formed Cu micro-rod is polycrystalline and the crystals are very fine. The cross section of the micro-rod was almost circular and the diameter was almost the same throughout its length. This technique also makes it possible to form straight metal structures as well as branched and layered micro-rods. This layered micro-rod fabrication technique can be applied to form resistance controlled micro wires.
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Hitoshi SHIKU, Ayako KUMAGAI, Hong Qun LUO, Yasufumi TAKAHASHI, Tomoyu ...
2010 Volume 78 Issue 2 Pages
122-125
Published: February 05, 2010
Released on J-STAGE: March 26, 2012
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Microcontact printing (μCP) with various proteins has been widely applied to biosensors and cell biology research. However, the mechanism of protein patterning in the μCP process is not clear in detail. We have electrochemically estimated enzyme concentration on glass slide patterned with μCP technique. We also estimated the enzyme concentration at the surface of poly(dimethylsiloxane) (PDMS), which corresponded to the enzyme activity at the PDMS stamp just before μCP. Our result suggested that it was possible to transfer enzyme monolayer from PDMS to glass surfaces with 100% efficiency with μCP. Immunoglobulin G (IgG) patterned with μCP was also characterized by tagging with enzyme labeled anti-IgG. Scanning electrochemical microscopy (SECM) image was obtained to visualize line and space pattern of IgG monolayer.
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Tsukasa NAGAI, Shinji TAMURA, Nobuhito IMANAKA
2010 Volume 78 Issue 2 Pages
126-128
Published: February 05, 2010
Released on J-STAGE: March 26, 2012
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A novel solid electrolyte type ammonia (NH
3) gas sensor was fabricated by the combination of the trivalent aluminum cation conducting solid electrolyte (Al
0.2Zr
0.8)
20/19Nb(PO
4)
3 with La
2O
2SO
4–(NH
4)
2HPO
4 as an auxiliary sensing electrode. Since the present sensor exhibited such a superior sensing performance of theoretical response, which obeys the Nernst relationship between the sensor EMF output and the logarithm of the NH
3 gas concentration along with the stable, continuous, and reproducible response even under humidified condition, it is greatly expected to be applied to a practical NH
3 gas sensing device.
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Kei MOCHIZUKI, Hirotaka IWATSU, Masao SUDOH, Yoshiaki ISHIGURO, Takayu ...
2010 Volume 78 Issue 2 Pages
129-131
Published: February 05, 2010
Released on J-STAGE: March 26, 2012
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A new amperometric sensor based on proton conducting membranes to CO was investigated. It was observed that the sensor current density showed almost linearity against CO concentration in the range of 0–3000 ppm at 200°C. In addition, the sensitivity at less than 300 ppm CO was detected clearly using phosphoric acid doped polybenzimidazole (PBI) membrane. It was found that PBI membrane had high selectivity of CO to H
2 in combustor exhaust gases at 200°C. Sensor performance using PBI membrane was less influenced by humidity than Nafion.
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Narumi OHTA, Kiyoshi INOKUMA, Keiko MIYABAYASHI, Mikio MIYAKE, Ichizo ...
2010 Volume 78 Issue 2 Pages
132-135
Published: February 05, 2010
Released on J-STAGE: March 26, 2012
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Cubic-shaped Pt nanoparticles have been deposited on carbon fiber (CF) electrode surfaces directly by two electrochemical techniques, namely, potential cycling and stepping in an aqueous solution of 1 mM K
2PtCl
4 and 0.1 M H
2SO
4 containing 1 mM NaI. It is shown that both nucleation and growth processes of the Pt phase formation on the CF surfaces were extensively suppressed by the strong interaction between Pt surface and I
− anions. Consequently, this has lead to the formation of the highly dispersed preferentially cubic-shaped Pt nanoparticles.
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Katsushi FUJII, Takashi KATO, Tsutomu MINEGISHI, Takahiro YAMADA, Hisa ...
2010 Volume 78 Issue 2 Pages
136-139
Published: February 05, 2010
Released on J-STAGE: March 26, 2012
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A single crystal and polycrystals of GaN grown by the Na-flux method were photoelectrochemically characterized. The flatband potential of the GaN single crystal was approximately 0.2 V anodic of the potential of the GaN layer grown by metal-organic vapor phase epitaxy. Clear photo-electrochemical response was observed for the GaN single crystal. The turn-on slopes of the photocurrent for the poly-crystalline samples were gentler than the slope for the single crystal. The turn-on slopes were probably affected by the high resistivity of grain boundaries in the polycrystalline samples.
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Akihide NOZAKI, Jin KAWAKITA, Seiji KURODA, Yukihiro SAKAMOTO
2010 Volume 78 Issue 2 Pages
140-142
Published: February 05, 2010
Released on J-STAGE: March 26, 2012
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It is important to reveal the growth mechanism of the conductive polymer upon electrochemical polymerization in order to control the morphology of the film as a shape of the conductive polymer. In this paper, the relation between the structure of the polypyrrole as the conductive polymer and the quantity of electricity during galvanostatic polymerization was studied with the microscopic observation. With the quantity of electricity in the current density of 0.75 to 7.5 A·m
−2, a particle of polypyrrole grew up to 15 µm in size at maximum while the thickness of the polypyrrole film was increased accompanying a stagnant behaviour around 25 µm to some extent, indicating increase in packing density of the polypyrrole particles.
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Shigeki KUROIWA, Tomomi SHIBASAKI, Tetsuya OSAKA
2010 Volume 78 Issue 2 Pages
143-145
Published: February 05, 2010
Released on J-STAGE: March 26, 2012
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Fabricating reference field effect transistor (FET) sensors instead of reference electrodes are important for the miniaturization and variegated applications of FET sensors. To make a reference FET, the gate surface of FET was modified with the self-assembled monolayer (SAM) of n-octadecyltrimethoxysilane (ODS). Though an ODS-SAM FET had low pH-sensitivity, it was cation-sensitive. This work demonstrates the relation between the surface morphology and the cationic and pH-sensitivity of ODS-SAM FETs. A roughness parameter of atomic force microscope images, the mean summit curvature (Ssc) has correlation with the cationic and pH-sensitivity of ODS-SAM FETs.
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Nunung NURYANTHI, Tetsuya YAMAKI, Hiroshi KOSHIKAWA, Masaharu ASANO, K ...
2010 Volume 78 Issue 2 Pages
146-149
Published: February 05, 2010
Released on J-STAGE: March 26, 2012
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Poly(vinylidene fluoride) (PVDF) membranes with conical and cylindrical nanopores were prepared in a controlled manner by the ion-track technique, which involved heavy-ion beam irradiation and subsequent alkaline etching. The etching behavior mainly depended on the energy deposition of the ion beams, and thus its depth distribution, estimated by theoretical simulation, was successfully applied to control the shapes and diameters of the etched pores. Scanning electron microscopy (SEM) and electrolytic conductometry provided an insight into the critical experimental parameters. Interestingly, applying a higher voltage to the conductometry cell promoted track etching up to breakthrough probably because electrophoretic migration of the dissolved products occurred out of each pore.
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Satoko TAKASE, Toshikazu MATSUMOTO, Youichi SHIMIZU
2010 Volume 78 Issue 2 Pages
150-152
Published: February 05, 2010
Released on J-STAGE: March 26, 2012
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Perovskite-type structured LaCoO
3 fine powder with high surface areas could be prepared by a polymer precursor method using acetylacetone (AcAc) as a chelating agent at 500°C. This fine powder could be used for an electrophoretic deposition (EPD) process in an acetylacetone-based suspension. The LaCoO
3 fine powder supported on carbon-cross device was prepared by the EPD method without a sintering process. The device showed good properties of amperometric sensing of hydrogen-phosphate ion.
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Eiji TADA, Ken-ichi OHGUCHI, Gaku MUSHA, Ken HADEHARA, Yuta MIURA
2010 Volume 78 Issue 2 Pages
153-156
Published: February 05, 2010
Released on J-STAGE: March 26, 2012
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Dog-bone shaped specimens of Cu foils were fabricated by a combination of electrodeposition and photolithography to investigate the effect of electrochemical condition on mechanical properties of the foils. Electrodeposition of Cu was conducted on a substrate with a dog-bone shaped metallic surface from an acidic CuSO
4 solution at a constant current density. Mechanical properties of the Cu foils were investigated by tensile test. From the results of the test, we found that tensile strength was increased but strain to failure was decreased with increasing current density. In addition, SEM observations for the Cu specimens prepared with different current densities revealed that the crystalline size became smaller with increase in current density till it reached a value. We concluded that mechanical properties of the Cu foils are related to the grain size of the Cu deposits.
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Takashi ITOH, Masaki UEBAYASHI, Kazuyuki TOHJI, Balachandran JEYADEVAN
2010 Volume 78 Issue 2 Pages
157-160
Published: February 05, 2010
Released on J-STAGE: March 26, 2012
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Fe–Pt nanoparticles fabricated by the polyol process have been reported as a possible alternative material for use in catalytic electrodes for polymer electrolyte fuel cells (PEFCs). Catalytic Fe–Pt alloys suffer from a problem where Fe dissolves from the alloy. Here, we examined the dissolution of Fe into the electrolyte for various composition ratios of Fe to Pt. We have also described the characteristics of Fe–Pt nanoparticles on the basis of XRD, XRF, TEM-EDX and electrochemical measurements and have discussed the rinse effect of Fe–Pt nanoparticles in acid solutions and the annealing effect of Fe–Pt caused by structural phase transitions from disordered fcc to ordered fct phase structures.
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