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- The Synthesis and Photocatalytic activity of Carbon Nanotube-mixed TiO2 Nanotubes
- Chun Woong Park, Young Do Kim, Tohru Sekino, Se Hoon Kim
- J Korean Powder Metall Inst. 2017;24(4):279-284. Published online August 1, 2017
- DOI: https://doi.org/10.4150/KPMI.2017.24.4.279
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Abstract
PDF The formation mechanism and photocatalytic properties of a multiwalled carbon nanotube (MWCNT)/TiO2- based nanotube (TNTs) composite are investigated. The CNT/TNT composite is synthesized via a solution chemical route. It is confirmed that this 1-D nanotube composite has a core-shell nanotubular structure, where the TNT surrounds the CNT core. The photocatalytic activity investigated based on the methylene blue degradation test is superior to that of with pure TNT. The CNTs play two important roles in enhancing the photocatalytic activity. One is to act as a template to form the core-shell structure while titanate nanosheets are converted into nanotubes. The other is to act as an electron reservoir that facilitates charge separation and electron transfer from the TNT, thus decreasing the electronhole recombination efficiency.
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- Low-Dimensional Carbon and Titania Nanotube Composites via a Solution Chemical Process and Their Nanostructural and Electrical Properties for Electrochemical Devices
Sunghun Eom, Sung Hun Cho, Tomoyo Goto, Myoung Pyo Chun, Tohru Sekino
ACS Applied Nano Materials.2019; 2(10): 6230. CrossRef
- Low-Dimensional Carbon and Titania Nanotube Composites via a Solution Chemical Process and Their Nanostructural and Electrical Properties for Electrochemical Devices
- [English]
- Fabrication of Nanocomposite Powders by Sonochemical Method
- Yamato Hayashi, Tohru Sekino, Koichi Niihara
- J Korean Powder Metall Inst. 2001;8(3):207-209.
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Abstract
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- Nano particles have recently been a major research interest, motivated by their unusual physical and chemical properties. Such particles can be synthesized using physical and chemical methods. The physical methods need expensive installation like vacuum induction furnace, whereas in chemical methods the process in generally very simple and low cost. In this study, simple and new fabrication process by using ultrasound was investigated to prepare the nano-sized metal particles on various powders at room temperature.
- [English]
- Multifunctionality in Ceramic/Metal Nanocomposites
- Tohru Sekino, Hiroki Kondo, Koichi Niihara
- J Korean Powder Metall Inst. 2001;8(3):186-191.
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Abstract
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- Several fabrication processes, corresponding nanostructural features and multifunctionality as well has been investigated for oxide ceramic based nanocomposites with metal nanodispersion (i.e., ceramic/metal nanocomposites). Transition metal (Ni, Co, etc) dispersed alumina and zirconia based nanocomposites have been synthesized by reducing and hot-press sintering of ceramic and metal oxide mixtures prepared by several method. Improved fracture strength (1.1 and 1.9 GPa for Al_2O_3/Ni and ZrO_2/Ni nanocomposites, respectively) of these composites have been achieved according to their nanostructures. In addition, ferromagnetic characteristic has been kept. The variation of magnetization with an applied stress has found to be more sensitive as smaller as the magnetic metal dispersion is. This result thus suggests the possibility of fracture and/or stress sensing of the composites by simple magnetic measurement.
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