Electrochemistry
Online ISSN : 2186-2451
Print ISSN : 1344-3542
検索
OR
閲覧
検索
78 巻 , 2 号
選択された号の論文の22件中1~22を表示しています
    • |<
    • <
    • 1
    • >
    • >|
論文特集号 電気化学を利用した機能性材料創出の最前線
展望
Headline
  • Ichizo YAGI, Akari HAYASHI, Ken’ichi KIMIJIMA, Hideo NOTSU, Naru ...
    78 巻 (2010) 2 号 p. 105-113
    公開日: 2012/03/26
    ジャーナル オープンアクセス
    Construction of nanomaterials has been developed from both top-down and bottom-up approaches. In these approaches, surfactant-templated mesoporous materials are promising because of their tunability, uniformity and reproducibility in both the size and shape of produced mesopores. Mesoporous silica materials have been widely and deeply investigated in the early stage, basing on the sol-gel chemistry of silicate. Although insulating mesoporous silica cannot be directly applicable to electrode materials, the mesoporous silica films and their hybrid films are recently applied as hard templates and electrodeposition of metals inside the mesopores realizes the formation of metal nanowire assembly, which has parallel orientation to the electrode surface. Furthermore, the mesoporous silica film with perpendicularly oriented mesochannels are prepared and used as hard-template, resulting in the fabrication of metal nanowire assembly standing on the electrode surface. On the other hand, conductive materials are recently fabricated as mesoporous structure by the surfactant-template method. Mesoporous carbon becomes the most conventional mesoporous conductive material and has been investigated as the electrode material mainly applicable to energy conversion. By introducing catalyst particles and ionomers inside mesochannels, triple phase boundary can be constructed and the application toward cathode electrode in the polymer electrolyte fuel cell (PEFC) has been investigated.
    抄録全体を表示
コミュニケーション
報文
  • Fei YANG, Wakana KUBO, Nobuyuki SAKAI, Tetsu TATSUMA
    78 巻 (2010) 2 号 p. 161-164
    公開日: 2012/03/26
    ジャーナル オープンアクセス
    Pt nanoparticles were photocatalytically deposited onto TiO2 to improve the photocatalytic remote oxidation activity. Among the conditions examined, deposition from 1–3 mM H2PtCl6 solution for 2–10 s gave the highest activity. Further deposition resulted in reduced activities, possibly due to overgrowth of the Pt nanoparticles. The average size of the Pt nanoparticles on the optimized photocatalyst was 2.7 nm. When the most active Pt-modified TiO2 was used, it took 50 s to make an octadecyltriethoxysilane-modified glass surface superhydrophilic by the remote oxidation (light intensity was 200 mW cm−2 and the gap between the photocatalyst and the glass surface was 7.5 µm).
    抄録全体を表示
  • Katsuhiko NISHIYAMA, Kazufumi INADA, Isao TANIGUCHI
    78 巻 (2010) 2 号 p. 165-169
    公開日: 2012/03/26
    ジャーナル オープンアクセス
    Selective determination of uric acid (UA) was conducted in the presence of ascorbic acid (AA) and acetaminophen (APAP) as interference species at an unmodified glassy carbon paste electrode (GCPE). Using the GCPE prepared in our lab, we succeeded in detecting UA in the presence of AA in acidic and alkaline media. The oxidation peak potential of APAP is very close to that of UA in neutral media, but in alkaline media, a peak separation of ca. 140 mV was obtained between UA and APAP on the differential pulse voltammogram. Moreover, voltammetric determination of tryptophan (Trp) and serotonin (5-HT) was successfully conducted by analyzing the redox peaks of their oxidation products at GCPEs in phosphate buffer solutions in the presence of interferences. The oxidation products of Trp and 5-HT provided redox couples at more negative potentials than for that of the interferences: 5-fold tyrosine (Tyr) did not hinder the determination of Trp, and 200-fold uric acid (UA) and acetaminophen (APAP) did not hinder the determination of 5-HT. In all samples studied in this research, glassy carbon paste electrodes were fairly better than graphite paste electrode.
    抄録全体を表示
  • Taro UEMATSU, Tsukasa TORIMOTO, Susumu KUWABATA
    78 巻 (2010) 2 号 p. 170-174
    公開日: 2012/03/26
    ジャーナル オープンアクセス
    Effects of reaction conditions on size-selective photoetching of CdTe nanocrystals were presented focusing on electron mediator and wavelength of irradiating light. Methyl viologen, which was expected to work as an electron mediator of photo-induced oxygen reduction accelerating the photoetching, decreased significantly the rate of the reaction. The results are compared with the photoetching of CdS nanocrystals in terms of overpotential for oxygen reduction and adsorption of electron mediators on nanocrystals. Under optimized conditions, the photoetching can produce highly monodispersed nanocrystals having fluorescence peak of fwhm value as small as 23.5 nm around the wavelength region where CdTe nanocrystals are stably produced by the conventional synthesis. However, further blue shifts of irradiating light gradually increased the fluorescence fwhm value, and the exciton peaks became unclear as well. The results were considered by comparing with recently reported magic-sized nanoclusters.
    抄録全体を表示
ノート
  • Yu HIRANO, Tomoyuki YASUKAWA, Yoshihiro SAWAYASHIKI, Hitoshi SHIKU, Fu ...
    78 巻 (2010) 2 号 p. 175-177
    公開日: 2012/03/26
    ジャーナル オープンアクセス
    We prepared a microfluidic device with an interdigitated array electrode modified with antibodies to develop immunosensors. A comb-type array (W1) was used for forming immunocomplexes and another (W2) for detecting mediators generated by the enzyme reaction. We used electropolymerization and avidin-biotin complexes for an addressable immobilization of antibodies on W1. Since the microfluidics significantly accelerated the formation of the immunocomplexes, a period as short as 10 min was sufficient to detect the responses. The current observed at bare array (W2) increased with increasing analyte (mouse IgG) concentration in the range of 1.0–100 ng/mL. Therefore, present procedure is suitable for rapid immunosensing in a simple device.
    抄録全体を表示
  • Atsushi AOKI, Shinya FUKAYAMA
    78 巻 (2010) 2 号 p. 178-180
    公開日: 2012/03/26
    ジャーナル オープンアクセス
    Organic thin film solar cells composed of the hetero-deposited Langmuir-Blodgett (LB) films were fabricated using poly(3-hexylthiophene) (P3HT) as a donor, [6,6]-phenyl C61 butyric acid methyl ester (PCBM) as an acceptor and poly(N-dodecylacrylamide) (pDDA) as an amphiphilic polymer. Various types of the solar cell such as the bulk heterojunction (BHJ) type, p-n heterojunction type, double layer BHJ type and P3HT single layer type solar cells were constructed and their photovoltaic properties were compared with them. The short circuit current densities observed at all the solar cells fabricated by LB technique were three orders of magnitude smaller than that of BHJ solar cell fabricated by spin-coating method because of the film resistance of the existence of pDDA for forming LB film. The open circuit voltage is interestingly obtained to be 1.23, 0.82 and 1.06 V at the P3HT single layer type, p-n heterojunction type and the double layer BHJ type solar cells fabricated by LB technique, resulting to be higher than 0.52 V at the BHJ type solar cell. The phenomena demonstrate that the hole produced by photoinduced charge separation can be accumulated at the P3HT layer of the solar cells.
    抄録全体を表示
 
    • |<
    • <
    • 1
    • >
    • >|
feedback
Top