Abstract
Nanostructured TiO2 coatings were successfully formed on polyethylene terephthalate (PET) films and fluorine-doped tin oxide (FTO) films in aqueous solutions. They contained an assembly of nanoneedles that grow perpendicular to the films. The surface area of the coatings on PET films reached around 284 times that of a bare PET film. Micro-, nano-, or subnanosized surface roughness and inside pores contributed to the high nitrogen adsorption. The coatings on FTO films showed an acetaldehyde removal rate of 2.80 μmol/h; this value is similar to those of commercial products certified by the Photocatalysis Industry Association of Japan. The rate increased greatly to 10.16 μmol/h upon annealing in air at 500 °C for 4 h; this value exceeded those of commercial products. Further, the coatings showed a NOx removal rate of 1.04 μmol/h; this value is similar to those of commercial products. The rate decreased to 0.42 μmol/h upon annealing. NOx removal was affected by the photocatalyst’s surface area rather than its crystallinity.
Highlights
Nanostructured TiO2 coatings were successfully formed on polyethylene terephthalate (PET) films and fluorine-doped tin oxide (FTO) films in aqueous solutions
The photocatalytic properties of the nanostructured T iO2 on FTO films were evaluated at the Kanagawa Academy of Science and Technology (KAST), Japan, based on Japanese Industrial Standards (JIS)
Even if homogeneously nucleated titanium oxide particles formed in the solution settle, they are less likely to be deposited on the PET film
Summary
Nanostructured TiO2 coatings were successfully formed on polyethylene terephthalate (PET) films and fluorine-doped tin oxide (FTO) films in aqueous solutions. The development of high performance nanostructured TiO2 films is a powerful demonstration of precise control of the size, shape, crystallinity, and the exposed crystal plane. The size, shape, crystallinity, and surface structure of metal oxides in aqueous solutions were controlled at room temperature and atmospheric pressure. They are called “Bio-mineralization” and have created a new academic field, “Bio-inspired mineralization”. Nanostructured TiO2 films were crystallized on polyethylene terephthalate (PET) films or fluorine-doped tin oxide (FTO) films in an aqueous solution containing ammonium hexafluorotitanate (50 mM) and boric acid (150 mM) at 50 °C for 24 h. The photocatalytic properties of the nanostructured T iO2 on FTO films were evaluated at the Kanagawa Academy of Science and Technology (KAST), Japan, based on Japanese Industrial Standards (JIS)
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