Electrochemistry
Online ISSN : 2186-2451
Print ISSN : 1344-3542
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74 巻 , 2 号
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論文特集号 センシングと界面設計
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  • Tomokazu MATSUE, Hitoshi SHIKU
    74 巻 (2006) 2 号 p. 107-113
    公開日: 2012/03/20
    ジャーナル オープンアクセス
    This article describes recent progress of cell-based electrochemical biosensors, especially focusing on the incorporation of micro-fabrication technology and gene-modified engineering. Modern electroanalytical techniques offer extremely low detection limits that are achievable using small sample volumes. Bio-MEMS (bio-micro-electromechanical system) technology allows on-line monitoring of cellular functions in which various analytical operations with microfluidics. Reporter gene systems are frequently used in gene-expression studies and applied to environmental monitoring and food safety analyses. These research trends have clearly demonstrated that electrochemical whole-cell devices will have strong impacts on modern biotechnology and become an indispensable tool to ensure the safety of our society.
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報文
  • Kouji TAKAHASHI, Fumiyo KUSU
    74 巻 (2006) 2 号 p. 192-196
    公開日: 2012/03/20
    ジャーナル フリー
    Slab optical waveguide (SOWG) spectroscopy was carried out for an in situ observation of ferroin and ferriin formed at an electrode/solution interface during electrolysis on an indium-tin oxide (ITO) electrode. A new spectroelectrochemical cell for SOWG spectroscopy was developed to observe in situ absorption spectra of species in the vicinity of the ITO electrode surface. A cyclic voltammogram (CV) of 5 mmol·dm−3 ferroin in 1 mol·dm−3 potassium nitrate aqueous solution was obtained as the potential swept from +1.4 to +0.4 V and then from +0.4 to +1.4 V. Furthermore a cathodic and anodic peaks appeared at +0.82 and +0.92 V, respectively. The SOWG spectra were obtained every 0.05 mV during the sweep. The SOWG spectra at the potential of +0.4 and +1.4 V were identical to the UV-VIS spectra of ferroin and ferriin, respectively. The concentration profiles near the electrode during cyclic voltammetry of ferroin were discussed based on the absorbance at 510 and 650 nm on SOWG spectra. Furthermore, in situ real-time monitoring of absorption during potential step experiment of ferroin was made at various incident angles from 70 to 77° using SOWG spectroscopy.
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  • Perumal ELUMALAI, Masaharu HASEI, Norio MIURA
    74 巻 (2006) 2 号 p. 197-201
    公開日: 2012/03/20
    ジャーナル フリー
    A planar NO2 sensor was fabricated by using a yttria-stabilized zirconia (YSZ) plate and Cr2O3 sensing-electrode (SE). The NO2 sensing performances were evaluated at 700°C in the presence of 5 vol.% water vapor for the sensor attached with each of Cr2O3-SE having different thicknesses. It was found that the NO2 sensitivity of the sensor was highest when the thinnest Cr2O3-SE was used and decreased with increasing thickness of SE. A linear correlation between the sensitivity and the NO2 concentration was observed at 700°C in the range of 50–400 ppm for each sensor. Based on the results of the measurements for the NO2 conversion to NO on each of Cr2O3 layers having different thicknesses, it was confirmed that the catalytic activity to the gas-phase NO2 decomposition on the Cr2O3-SE matrix played an important role in deciding the NO2 sensitivity of the present sensor.
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ノート
  • Yukari SATO, Dai KATO, Seiichiro IIJIMA, MIZUTANI Fumio, Osamu NIWA
    74 巻 (2006) 2 号 p. 202-204
    公開日: 2012/03/20
    ジャーナル フリー
    11-Ferrocenyl-1-undecanethiol (FcC11SH) self-assembled monolayer and poly(divinylferrocene) film (PDVF) on gold electrodes were used for the electrochemically-controllable catalysts for chemiluminescence of luminol. When the electrode potential became positive, ferrocene species of both monomolecular layer and polymer film on gold were oxidized to ferricinium cation species and then they catalyzed the chemiluminescence of luminol. In the case of FcC11SH monolayer, the number of surface attached ferrocene groups was two orders smaller than that in the case of the PDVF film estimated from the electrochemical measurements, although magnitudes of luminosities were similar. This result indicates that the FcC11SH monolayer modified gold electrode showed more efficient luminosity than that of polymer film modified gold electrode. Ferrocene groups on the FcC11SH/electrode surface can be re-oxidized to ferricinium cation species much easily. The catalytic reaction of chemiluminescence takes place only at the surface layer on the polymer film modified gold electrode.
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