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All Journal Makara Journal of Technology
Kenji Murakami
Research Institute of Electronics, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8011, Japan
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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Influences of Surface Morphology of Nanostructured Rutile TiO2 Nanorods/Nanoflowers as Photoelectrode on the Performance of Dye-sensitized Solar Cell Bin Ahmad, Mohd Khairul; Murakami, Kenji
Makara Journal of Technology Vol. 17, No. 2
Publisher : UI Scholars Hub

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Aligned Rutile TiO2 nanorods (r-TNRs) and TiO2 nanoflowers (r-TNFs) were successfully prepared by hydrothermal method. Using hydrochloric acid (HCl) as chelating agent and titanium butoxide (TBOT) as precursor, aligned r-TNRs with r-TNFs were successfully growth onto fluorine-doped tin oxide (FTO) with different morphologies. The influences of surface morphologies to the rutile based Dye-sensitized solar cell (DSC) efficiency are discussed. The highest lightto- electric energy conversion efficiency, 1.80% is achieved using different concentration under simulated solar light illumination of 100 mWcm-2 (1.5 AM).
Improvement in Performance of ZnO based DSC Prepared by Spraying Method Winantyo, Rangga; Liyanage, Devinda; Murakami, Kenji
Makara Journal of Technology Vol. 17, No. 2
Publisher : UI Scholars Hub

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This paper reports the effect of TiCl4 on the performance of ZnO based DSC. ZnO was used due to its stability against photo-corrosion and photochemical properties similar to TiO2. Thin films of nanocrystalline ZnO were deposited on transparent conducting oxide glass using spray method. The ZnO films were treated using TiCl4. The cell’s efficiency was found to be 2.5% with TiCl4 post-treatment and 1.9% without TiCl4 post-treatment.
Construction of a Novel Method of Measuring Thermal Conductivity for Nanostructures Ikeda, Hiroya; Yoshida, Shoma; Suzuki, Yuhei; Manimuthu, Veerappan; Salleh, Faiz; Kuwahara, Fujio; Shimomura, Masaru; Murakami, Kenji
Makara Journal of Technology Vol. 19, No. 1
Publisher : UI Scholars Hub

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With the aim of characterizing the thermal conduction in a nanometer-scaled materials, we have constructed a novel method on the basis of an ac calorimetric method. In this method, periodic sample heating is performed by light irradiation and the corresponding periodic temperature is detected by infrared irradiative thermometer. This makes us measure the thermal diffusivity out of contact with the objective sample. In the present study, we confirm to measure the thermal diffusivity of bulk Si and Cu by this non-contact method with halogen-lamp irradiation. In determining the thermal diffusivity from the relationship between distance deviation and delay time, the simplest wave equation is used, and the obtained values of thermal diffusivity for Si and Cu are close to those reported. Therefore, this non-contact method is useful for evaluating the thermal conduction and applicable for nanometer-scaled materials by improving local heating and local detecting systems.
Co-Authors Bin Ahmad, Mohd Khairul Devinda Liyanage, Devinda Faiz Salleh Fujio Kuwahara Hiroya Ikeda Masaru Shimomura Mohd Khairul Ahmad, Mohd Khairul Rangga Winantyo, Rangga Shoma Yoshida Veerappan Manimuthu Yuhei Suzuki