ZnO Powders Prepared by the Vapor Phase Reaction Using Zinc Acetylacetonate Complex and Water Vapor

Abstract

Fine powders of ZnO with the size from 21 to 36 nm were prepared by the vapor phase reaction using zinc acetylacetonate. complex and water at 100-800°C. However, ZnO powders were not produced by the reaction using zinc acetylacetonate complex and dry 02 gas at 400°C or below. The formation of ZnO powders was confirmed by X-ray powder diffraction patterns and IR spectra. The particle size of powders was mainly measured by means of an electron microscope with high resolving power. The particle size increased with the elevation of reaction temperature above 200°C. At 800°C, the particle size grew big gradually with increasing vapor pressure of the chelate, and became smaller with increasing flow rate of gas into the reactor.