Synthesis and Characterization of Semiconductor Nanoparticles CuInS<sub>2</sub> QDs/TiO<sub>2</sub>

Abstract

Synthesis and characterization of CuInS2 quantum dots (QDs) and CuInS2 QDs/TiO2 with varied temperature reaction (200; 215°C) and TiO2 precursor concentrations was conducted using wet chemical method. The as-synthesized CIS with higher reaction temperature exhibited deep-red emissions and enhanced the photoluminescence (PL) intensity, indicating the reduction of surface defects. With the addition of TiO2 precursor, particle size decreased, bandgap energy increased, and the absorption edge shifted to the blue region. The UV-Vis absorption shifting expands the light-absorbing region. CIS hybridized with 150 μl TiO2 precursor (CIS-TO 150) has particle size 2.15 nm with tetragonal chalcopyrite crystal structure and bandgap energy 2.72 eV. This property gives a great potential for wide range of application via photocatalytic mechanism under visible light.