Fabrication and Characterization of ZnO Nanostructures Using Carbothermal Evaporation Technique on Silicon Substrates Using Gold as Catalyst

摘要

Nanostructures ZnO have been fabricated on gold coated silicon substrates by sintering the mixture of ZnO and graphite powders in air. The effects of the position of the substrates to the ZnO source, Ar gas flow rates and the furnace temperature were investigated. ZnO nanostructures have been characterized using field-emission scanning electron microscopy (FESEM), Energy dispersive X-ray spectroscopy (EDX) spectrum and X-ray diffraction (XRD). XRD found peaks corresponding to hexagonal ZnO while, FESEM result indicated different morphologies of ZnO nanostructures with different size grown in gold coated silicon substrates. It has been found that the morphology of the ZnO nanostructures is strongly dependant to the location of the substrate and to the source evaporating temperature. While, gas flow rate plays a key role for changing the growth density and the size of ZnO nanostructures.