Online ISSN : 2186-2451
Print ISSN : 1344-3542
ISSN-L : 1344-3542
Volume 79 , Issue 10
Showing 1-25 articles out of 25 articles from the selected issue
Progress Towards the Development of Green Sustainable Chemistry Using Photofunctional Interfaces
  • Shuzi HAYASE, Yuhei OGOMI, Shyam S. PANDEY
    2011 Volume 79 Issue 10 Pages 761-767
    Published: 2011
    Released: March 30, 2012
    Researches aiming at high efficiency-dye-sensitized solar cells (DSC) are reviewed from the view point of photoconversion interfaces. Developments of dyes converting photons to electrons in near infrared regions are essential for increasing short circuit current (Jsc). Hybrid cells consisting of double dye structures and double titania layer structures are proposed. Leak currents at photoconversion interfaces decrease open circuit voltage (Voc) and fill factor (FF). Therefore, strategies for decreasing leak currents are essential, especially for all-solid DSCs and I/I3 free DSCs. Structures of these interfaces are discussed in terms of surface passivation, self-organization, dye structures, interactions between dyes and I3 in titania nanopores. Fundamental studies for tandem cells are also reported.
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Comprehensive Paper
  • Katsuyoshi IKEDA
    2011 Volume 79 Issue 10 Pages 768-772
    Published: 2011
    Released: March 30, 2012
    Plasmonic field localization is normally utilized on irregularly roughened surfaces or nanostructured surfaces of coinage metals. Although localized fields increase photon-molecule interactions, metal-molecule interactions become an uncontrollable variable because atomic surface features are not organized in such nanostructured metals. However, construction of sphere-plane nano-gaps on atomically defined metal surface enables us to manage metal-molecular interactions in addition to control of plasmonic resonance features. In SERS spectroscopy using this system, well-managed electromagnetic and chemical contributions provide detailed information on geometric and electronic structures of molecular adsorbates. Moreover, highly localized fields within the nano-gaps extend the range of SERS application to highly damping catalytic metal surfaces. In photo-energy conversion, incident photon to current conversion efficiency in porphyrin-based molecular monolayer system is largely increased by optical antenna effect of the nano-gaps.
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  • Ponchio CHATCHAI, Atsuko Y. NOSAKA, Yoshio NOSAKA
    2011 Volume 79 Issue 10 Pages 821-825
    Published: 2011
    Released: March 30, 2012
    The surface of a p-Cu2O semiconductor photoelectrode was modified by electrodeposition of Pt nanoparticles and analyzed by XRD, SEM, XPS, and EIS (electrochemical impedance spectrometry) methods besides photocurrent measurements. The XRD, SEM, and XPS analyses showed the fabrication of Cu2O film and the deposition of Pt particles. On the electrodeposition of Pt nanoparticles, cathodic photocurrent was enhanced. The EIS analysis suggested that Pt nanoparticles enhance the charge transfer process to the solution.
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  • Yukio NARUKE, Hisashi TANAKA, Hisashi HARADA
    2011 Volume 79 Issue 10 Pages 826-830
    Published: 2011
    Released: March 30, 2012
    Sonophotocatalysis of malonic acid solution was carried out in an argon atmosphere. The coupling effects of the combination of photocatalysis and sonolysis were observed. The decomposition rate of malonic acid was improved; that is, the reaction rate for a combined system was higher than the sum of the rates of photocatalysis and sonolysis. Hydrogen peroxide formed from solvent (water) during sonolysis plays an important role for the synergistic effect. A small amount of succinic acid was detected by sonophotocatalysis. It is a characteristic product of the combined system and was not observed for each individual irradiation system. In this process, the carbon numbers of dicarboxylic acid increased from C = 3 (malonic acid) to C = 4 (succinic acid), namely increasing molecular weight or alkyl carbon chain elongation. Therefore, sonophotocatalysis has the potential to make a valuable contribution to organic reactions in water.
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  • Junji SASANO, Kenjiro MOTOMURA, Miho NAGAI, Fariza Binti MOHAMAD, Masa ...
    2011 Volume 79 Issue 10 Pages 831-837
    Published: 2011
    Released: March 30, 2012
    Pulse electrodeposition of p-type CuO semiconductor films for the light absorption layer of photovoltaic cells was conducted. Shapes of the potential pulse affected the crystallinity of CuO films. X-ray diffraction (XRD) spectra of all the CuO films among this study showed (002) orientation through the heteroepitaxial growth on the (111)-oriented Au substrates. The CuO layer formed with the most favorable pulse condition showed a sharp diffraction peak assigned to (002) plane of CuO with 0.20° of full width at half maximum (FWHM) value, in contrast to that of the CuO film potentiostatically deposited at 850 mV vs. Ag/AgCl being 0.46°. The FWHM values indicated that the pulse-deposited CuO film had much better crystallinity and contained less residual stress induced by electrodeposition than the potentiostatically deposited CuO. Photocurrent of the pulse-deposited CuO film in NaOH solution was greater than that of the potentiostatically deposited CuO. This enhancement in photoresponse was considered to be due to the high crystallinity of pulse-deposited CuO.
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Technological Report
  • Tsuyoshi OCHIAI, Kazuya NAKATA, Taketoshi MURAKAMI, Yuko MORITO, Shuns ...
    2011 Volume 79 Issue 10 Pages 838-841
    Published: 2011
    Released: March 30, 2012
    The novel photocatalysis-plasma hybrid air-purification unit using a titanium-mesh sheet modified with TiO2 (TMiPTM) and a surface discharge-induced plasma (SPCP) was investigated. The SPCP unit generates air-plasma on wide area of its surface and TMiP sheet was successfully irradiated by air-plasma without any destruction. Significant decomposition of the ammonia gas has been achieved by the photocatalysis-plasma hybrid reactor. In the present experimental condition, the SPCP unit without TMiP and UV-lamp with TMiP was not effective on the decomposition of the ammonia gas. Therefore, synergistic effects of catalytic activation and plasma excitation on the hybrid reactor with large surface area is useful for significant oxidative decomposition of gaseous pollutants.
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