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Synthesis and characterization of nanostructured anatase TiO2 with high-energy facets obtained by a mild method

This paper is available in a repository.
This paper is available in a repository.

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Abstract

In recent years, published works about obtaining TiO2 nanoparticles possessing ultra-reactive surfaces have increased exponentially, due to the great interest of their higher reactivity both from a scientific point of view as technological. The unique physical and chemical properties of TiO2 nanoparticles give them a potential application in a wide range of fields such as photocatalysis, dye-sensitive solar cells (DSCs), Li batteries, transparent conductors and so on. These properties depend not only on the crystal phase and particle size but also on the particle shape. Herein, we report a new approach based on a low temperature technique at atmospheric pressure for the synthesis of nanostructured anatase with high-energy facets. TiO 2 particles have been synthesized with different morphologies depending on working conditions: nanostuctured spheres with size of 4-5Pm and truncated rhombic nanoparticles of 20-30 nm. In this work all reactions were carried out at low temperature using Ti(ButO) 4 as the starting precursor, due to it slows the process of diffusion and polymerization, respect to other Ti precursors. Except for the obtaining of TiO 2 spheres, EtOH 96% provides the water necessary to accelerate the hydrolysis reaction, and oleic acid (OA) and oleylamine (OM) were used as two distinct capping surfactants to control the size and the shape of the products. In this manner, a new synthetic route has been established, less drastic, more economical and more environmentally friendly to obtain nanostructured particles of anatase TiO2 .