Journal ArticleDOI
Titania Nanotubes Prepared by Chemical Processing.
TLDR
In this paper, a method for the synthesis of needle-shaped titanium oxide (TiO2) nanotubes was proposed. But the method was not suitable for the case of amorphous raw materials, and it required the use of distilled water and HCl aqueous solution.Abstract:
We report a new method for the synthesis of titanium oxide (TiO2) nanotubes. When anatase-phase- or rutile-phase-containing TiO2 was treated with an aqueous solution of 5–10 M NaOH for 20 h at 110 °C and then with HCl aqueous solution and distilled water, needle-shaped TiO2 products were obtained (diameter ≈ 8 nm, length ≈ 100 nm). The needle-shaped products are nanotubes with inner diameters of approximately 5 nm and outer diameters of approximately 8 nm. The formation mechanism of titania nanotubes is discussed in terms of the detailed observation of the products by transmission electron microscopy: the crystalline raw material is first converted to an amorphous product through alkali treatment, and subsequently, titania nanotubes are formed after treatment with distilled water and HCl aqueous solution.read more
Citations
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Dissertation
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Photoactive Properties of Nanostructured Titania Modified Polyurethanes
Abstract: TiO2 nanofibers and nanotubes are of great interest due to their high specific areas, defined dimensions and enhanced photocatalytic activity. In order to prevent the aging from weakening the mechanical strength of polymer coatings with self-cleaning ability, in this work, the effect of thin layers of SiO2 deposited onto the surface of titania nanostructures, both before and after integration into polyurethane nanocomposites, is investigated. TiO2 nanofibers were synthesized via an environmental friendly supercritical CO2 method and the TiO2 nanotubes were synthesized by a conventional hydrothermal reaction. SiO2 was added using a modified Stöber approach. The results showed that with more SiO2 coated onto the nanofibers’ surface, the photocatalytic activity, UV absorbance, and hydroxyl radical formation decreased due to the shielding effect of the SiO2 layers. Polyurethane coatings integrating these nanofibers and nanotubes exhibited similar photoactivity trends as the individual nanostructures. Moreover, the mechanical strength of the composites was enhanced and protected from aging under UV light. The hydrophobicity of coatings was prevented from changing under UV irradiation by addition of these silica encapsulated 1D titania structures.
Journal ArticleDOI
Fabrication of Inorganic Sensitized Solar Cells by Drop Casting Deposition of PbSe and PbTe on the TiO2 Surface
TL;DR: In this article, PbSe and PbTe sensitized TiO2 solar cells were fabricated using a drop cast method using atomic force microscopy (AFM) and diffuse reflectance spectroscopy (DRS) spectra.
References
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Journal ArticleDOI
Titania Nanotubes Prepared by Chemical Processing
TL;DR: In this paper, a method for the synthesis of needle-shaped titanium oxide (TiO2) nanotubes was proposed. But the method was not suitable for the case of amorphous raw materials, and it required the use of distilled water and HCl aqueous solution.