Micro-structural Evolution and Optical Performance of TiO₂ Nano-particles and CdS–TiO₂ Nano-composite Materials

In the present work, we elaborated the CdS–TiO₂ (CSTO) composite materials and considered their micro-structural and optical properties were investigated. The micro-structure and optical properties were examined by TEM, XRD, absorption and PL. The particles dimensions of composite have been varied from 18 to 22 nm while the typical crystalline size of TiO₂ sample materials was varied involving the 9 nm and 14 nm. The direct band-gap of TiO₂ nano-particles is 3.33 eV and E_g of CSTO sample is enlarged to 3.31 eV. The TEM show the existence of the CdS could efficiently hibit the agglomeration of the CSTO and progress the dispersion of particles. The photo-luminescence (PL) spectra illustrate that the CSTO sample has two tough emissions. These clarification results from the creation of the CSTO bond and the existence of CdS roughly anatase, which would impede the development of TiO₂ powder. The internal micro-structure, thus obtained will make the permanence of our composite sample, allowing a development of optical features of TiO₂ composite.