Abstract
Sols with stable dispersion of layered titanate nanoparticles were prepared at 298 K using dialysis of a mixed solution of ethylene glycol, TiCl3, ammonium carbonate, and H2O2. Raman spectra of the particles in the obtained sols showed Raman scattering peaks which can be assigned to a layered titanate structure. The stability of the obtained sols depended on the molar ratio of [ammonium carbonate] / [Ti ion]. The molar ratios of 3, 4, and 5 produced transparent yellow stable sols. Peptization of titanium hydroxide precipitate with H2O2 formed stable sols with dispersion of layered titanate nanoparticles, which had plate - shaped morphology. The obtained sols formed layered titanate thin films on glass substrates easily by drying the sols. Furthermore, when the layered titanate thin films were heated at 773 K for 1 h, anatase TiO2 thin films were obtained with (101) orientation of crystallites and optical transparency.
Highlights
Titanium oxides have potential applications as photocatalysts, as electrical and optical materials, and as coating materials for controlling UV-shielding properties [1, 2]
When titanium oxide nanoparticles with controlled shapes such as sheet or plate are coated onto a substrate, the obtained films have the orientation of the crystallites, which depends on the nanoparticle morphology [6,7,8]
The XRD peaks whose 2 values were less than 10° were observed and the peaks corresponded to X-ray diffraction of the interlayer of a layered titanate structure
Summary
Titanium oxides have potential applications as photocatalysts, as electrical and optical materials, and as coating materials for controlling UV-shielding properties [1, 2]. For these applications, the development of preparation methods for the titanium oxide thin films with simple processes is an important issue because it is necessary to prepare titanium oxide thin films on many different types of substrates such as glasses and organic polymers [3]. The sols with stable dispersion of layered titanate particles are useful as good coating materials for TiO2 thin films
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