Abstract
In this study, we demonstrate the large-scale synthesis of wurtzite ZnS nanostructures by simple thermal evaporation of ZnS powder in the presence of Au catalysts at 970 °C. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD) analyses demonstrated that the ZnS nanostructures consisted of nanobelts, nanosheets, and nanorods with a hexagonal wurtzite structure. The nanobelts have lengths ranging from tens to hundreds of micrometers, thicknesses of tens of nanometers, and widths ranging from hundreds of nanometers to the order of micrometers. The preferred growth axis of single crystalline nanobelts was found to be [01-11] or [0001]. Large single crystalline nanosheets also formed with flat surfaces. ZnS nanorods grew preferably in the [0001] direction with uniform diameters, with their ends attached to Au particles. Small amounts of bicrystal and tricrystal nanobelts were also observed. The formation of ZnS nanostructures with various morphologies was mainly due to the local concentration difference of ZnS vapor. The growth process was proposed on the basis of vapor−liquid−solid (VLS) and/or vapor−solid (VS) crystal growth mechanisms. Room-temperature photoluminescence measurements showed that the synthesized ZnS nanostructures had a strong green emission band at a wavelength of 522.5 nm, which may be ascribed to deep-level emissions induced by defects and/or Au impurity.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.