Synthesis and characterization of single phase ZnO nanostructures via solvothermal method: influence of alkaline source

Abstract

Single phase ZnO nanostructures were synthesized by simple and low temperature solvothermal process from two different alkaline sources; Potassium hydroxide (KOH) and Sodium hydroxide (NaOH) with zinc acetate dihydrate (Zn(CH3COO)2∙2H2O) as precursor. This facile and rapid synthesis technique achieve high purity of Zinc oxide (ZnO) nanostructures on large scale negating the use of complex and high temperature routes. The synthesized particles were characterized by X-Ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), Transmission Electron Microscopy (TEM), Energy-dispersive X-ray spectroscopy (EDX), Fourier Transform Infrared (FT-IR) Spectroscopy, Ultraviolet Visible (UV-Vis) spectroscopy and Brunauer-Emmett-Teller (BET) analysis. ZnO synthesized using KOH and NaOH exhibit wurtzite hexagonal and flake-like nanostructures with average crystallite size of 11.0 nm and 14.9 nm respectively. Surface area of 59.50 m2/g and 31.43 m2/g were determined for KOH and NaOH sources respectively. The optical absorption spectra of the two samples showed absorption bands of 367.70 and 365.30 nm. The results showed the effect of alkaline sources on the surface morphology, structural and optical properties of ZnO.

Biofilm-Resistant Nanocoatings Based on ZnO Nanoparticles and Linalool

“…Among these, ZnO has been recognized as a safe food additive by the U.S. Food and Drug Administration (FDA) [20,21]. The antimicrobial activity of ZnO NPs is even greater than that of the bulk material due to their small dimensions, which are size-correlated to the biological systems they interact with, facilitating intracellular uptake, as well as to their high surface to volume ratio associated with high surface energy [20,[22][23][24][25][26][27][28]. ZnO is a n-type semiconductor, and, after cellular internalization, ZnO NPs generate harmful reactive oxygen species (ROS) through a series of oxidation-reduction reactions initiated either photochemically or by the surface defects of the nanomaterial.…”