Hydrothermal synthesis of TiO2 quantum dots with mixed titanium precursors

摘要

Anatase titanium dioxide quantum dots (QDs) are synthesized by using a mixture of two kinds of titanium precursors and simple hydrothermal method in aqueous solution without any template and organic solvent. The obtained product is assessed by X-ray diffraction (XRD), selected area electrondiffraction (SAED), Raman spectroscopy, transmission electron microscopy (TEM) and ultraviolet-visible diffuse reflectance analysis (UV DRS). The results of XRD, SAED and Raman spectrum demonstrate that pure anatase TiO2 is produced. The TEM images reveal that TiO2 anatase QDs are almost sphere in shape and with a mean particle diameter of similar to 4 nm. The energy band gap value (Eg) is calculated to be similar to 3.79 eV. The synthesized TiO2 QDs present enhanced photocatalytic activity and stability for the photodegradation of organic dyes under UV light irradiation.