Preparation and Characterization of Needle-like ZnO onTiO_2 Nanoparticles by Solution-Immersion Method and RF Magnetron Sputtering

摘要

Needle-like zinc oxide (ZnO) nanostructures was deposited on titanium dioxide (TiO_2) nanoparticles by solution-immersion method and Radio Frequency (RF) magnetron sputtering with diffferent RF powers, respectively on a glass substrate to synthesis nanocomposites of ZnO/TiO_2. Field Emission Scanning Electrons Microscope (FESEM) images demonstrate that needle-like ZnO (112-1110 nm) are deposited on the surface of the TiO_2 nanoparticles with the diameter of approximately 36.3-62.9 nm. At 200 W, more needle-like ZnO with smallest average diameter (112 nm) appeared on the TiO_2 nanoparticles, which also has the smallest average size of 36.3 nm. The compositions of elements in the nanocomposites were showed by Energy Dispersive X-ray Spectrometry (EDX). All elements of Ti, O, and Zn are observed as major components which confirm the presence of TiO_2 and ZnO in the composite. X-ray Diffraction (XRD) patterns of the nanocomposites show ZnO formed on TiO_2 nanoparticles are hexagonal with a wurtzite structure and it revealed ZnO/TiO_2 thin films were succesfully deposited as nanocomposites of ZnTiO_3 at 100 W, Zn_2TiO_4 at 150 W and Zn_2Ti_3O_8 at 200 W and above.