- Titanate Nanotube Formation and Nanostructure Development from the Reaction of TiO2 Nanopowder and Alkalihydroxide
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Eun-Ju Jin, Doh-Hyung Riu, Seung-Hun Huh, Chang-Yeoul Kim, Hae-Jin Hwang
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J Korean Powder Metall Inst. 2008;15(2):125-135.
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DOI: https://doi.org/10.4150/KPMI.2008.15.2.125
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- [ TiO_2 ] nanotubes for photocatalytic application have been synthesized by hydrothermal method. TiO_2 nanotubes are formed by washing process after reaction in alkalic solution. Nanotubes with different morphology have been fabricated by changing NaOH concentration, temperature and time. TiO_2 nanoparticles were treated inside NaOH aqueous solution in a Teflon vessel at 110°C for 20 h, after which they were washed with HCl aqueous solution and deionized water. Nanotube with the most perfect morphology was formed from 0.1 N HCl washing treatment. TiO_2 nanotube was also obtained when the precursor was washed with other washing solutions such as NH_4OH, NaCl, K_2SO_4, and Na_2SO_3. Therefore, it was suggested that Na+ ion combined inside the precursor compound slowly comes out from the structure, leaving nanosheet morphology of TiO_2 compounds, which in turn become the nanotube in the presence of hydroxyl ion. To stabilize the sheet morphology, the different type of washing treatment solution might be considered such as amine class compounds.
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Citations to this article as recorded by  - Coating Property of Hybrid Structured Photo-Electrode to Increase Dye-Sensitized Solar Cells Efficiency
Min-Hee Kim, Hyung-Woo Lee, Young-Keun Jeong
Journal of Korean Powder Metallurgy Institute.2010; 17(6): 449. CrossRef
- Design of Nanocluster Based Material with Catalytic Properties
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Nakayama Tadachika, Chang-Yeoul Kim, Sekino Tohru, Yong-Ho Choa, Kusunose Takafumi, Hayashi Yamato, Niibara Koichi
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J Korean Powder Metall Inst. 2001;8(3):197-200.
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Abstract
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- Modified inert gas condensation method was used to produce the nanocluster composites of CuO/CeO_2. High-resolution TEM, SEM and catalytic measurements have been used to characterize the samples and study the synergistic effect between the CuO phase and CeO_2(ceria) support. By varying the He pressure, the heating temperature and configuration of the heating boats inside the modified gas condensation chamber, nanoclusters of varying sizes, shapes and composition can be produced. The composition and nanostructured morphology were shown to influence the catalytic properties of the system. A copper content around 10 at% with a morphology that favors high-energy surfaces of ceria is shown to be beneficial for a high catalytic activity.
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