ELECTROPHORETIC DEPOSITION OF ZnO NANORODS AND NANOPARTICLES

Abstract

A simple route involving the reaction between zinc powder and water under controlled pH and temperature was used to prepare ZnO nanorods (see Panchakarla et al.). Zinc oxide nanoparticles were prepared also using solÀgel method starting from zinc acetate precursor (as per Zang et al.). Thin¯lms were prepare from both nanorods and nanoparticles by electrophoretic deposition (EPD) in aqueous media (see Dogan et al., Wang et al., Lommens et al., Tang et al. and Besra et al.).To have a uniform microstructure in the deposited¯lms, the aqueous suspension was stabilized using an anionic surfactant. The e®ect of voltage and pH on the rate of electrophoretic deposition from nano zinc oxide colloid was studied in detail. Scanning electron microscopy (SEM), X-ray di®raction (XRD), Atomic force microscopy (AFM) and UV-Vis Spectroscopy were used to characterize ZnO thin¯lms after sintering.

EPD-deposited ZnO thin films: a review

“…They analyzed the influence of the applied voltage, deposition time and quantum dot concentration on the final layer thickness, and obtained ZnO layers with thicknesses ranging from a few QD monolayers to 250 nm by applying voltages ranging from 20 to 60 V. However they reported that for layers thicker than a few monolayers, the deposition rate was considerably smaller than the theoretically calculated value, which points towards a strong screening of the electric field by the deposited ZnO layer. This observation was confirmed by Balaji et al [70], who reported a sharp decrease of the current density for deposition times higher than 50 seconds. In addition, Miao et al [71] studied the influence of other parameters, such as aging treatment of ZnO nanocrystallites and suspension concentration on the deposit weight.…”

Electrophoretic deposition of manganese dioxide films using new dispersing agents

“…14 These studies highlighted the importance of chemical structure and functional groups of dispersants for their adsorption on particle surface and particle charging. [15][16][17] It is important to note that non-adsorbed ionic dispersant acts as an electrolyte, promoting particle agglomeration. The interest in the use of dispersant molecules from catechol and salicylate families is attributed to their chelating properties, which allowed strong adsorption of the molecules on metal oxide particles by creating complexes with metal atoms.…”