Highly oriented-ZnO nanorods from hydrothermally depositions: Synthesis and optical properties

Abstract

Abstract A highly (002)-oriented ZnO NRs on the Si/SiO2 substrate was successfully synthesized by the spray-hydrothermal method, where ZnO nanoparticles (ZnO NPs) were used as templates. Interestingly, by varying deposition temperatures from 150 to 350 °C, we successfully modified the orientation of the nanorod from vertical/horizontal to globular. This result is related to the agglomeration of ZnO NPs in the deposition process. Furthermore, globular ZnO NR showed a high electron transfer up to ∼9×1014 Ω−1 cm−1 eV with the presence of an excitonic state. Our results will provide an alternative in designing the structure and morphology of ZnO NR at a more affordable cost for high-performance optoelectronic applications.