Preparation and characterization of host (mesoporous aluminosilicate material)-guest (semiconductor nanoparticles) nanocomposite materials

摘要

We report the optical and structural properties of NiS and CoS nanoparticles in A1MCM-41 zeolite. The samples were obtained by sulfidation of the Ni~(2+) and Co~(2+) ion exchange zeolite in a Na_2S solution at room temperature. The optical properties of the samples were studied by UV-Vis spectroscopy. Their crystalline structure and morphology were studied by XRD and scanning electron microscopy (SEM). The results show that the nanoparticles grow outside the mesopore A1MCM-41 matrix. Exciton absorption peaks at higher energy than the fundamental absorption edge of bulk NiS and CoS indicate quantum confinement effects in nanoparticles as a consequence of their small size. The absorption spectra show that the optical band gap varies in the range 3.53-4.47 eV.