| Abstrakt: |
Ex-situ technique was used to combine the zinc oxide (ZnO) and lead sulphide (PbS) nanoparticles which had been separately synthesized by the chemical bath deposition method to make ZnO-PbS nanocomposites with different molar ratios of ZnO and PbS. XRD (X-ray diffraction) and a field-emission scanning electron microscope were used to analyze the morphology and structure of the ZnO, PbS, and ZnO--PbS samples. A broad and continuous emission peak was observed for ZnO nanoparticles at 400 nm, while an emission peak strongly indicative of PbS nanomaterials was detected at 800 nm, according to data collected using a UV--vis spectrophotometer. Since defects and excitonic center exchange occur in ZnO and PbS nanoparticles, respectively, the ZnO--PbS nanocomposites showed dual emission in the visible and NIR bands. ZnO nanorods in the shape of hexagons, with a diameter of 150-175 nm, exhibit a hexagonal structure, homogeneous distribution, and well-aligned semi-vertically; PbS cubes, with a diameter of 100-200 nm, demonstrate their nanocrystalline nature. PbS atoms also exhibit higher diffractograms than ZnO atoms, based on X-ray diffraction (XRD). [ABSTRACT FROM AUTHOR] |
