The Study of Electrodeposition of Iron Oxide Nanostructures

• Main Authors: Jia-Ming Chang, 張家銘
• Other Authors: Ing-Chi Leu
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/89716459260795771218

碩士 === 國立聯合大學 === 材料科學工程學系碩士班 === 95 === In the study, the electrodeposition of iron oxide films on cathode has been carried out through the interaction of species Fe2+ with generated hydroxyl ions to form iron hydroxide. We also add ethylene glycol and hydrazine monohydrate into the solution in order to characterize their effect on the phase composition of the deposited films. According to XRD and SEM analysis, the effect of solution chemistry on phase composition, microstructure and texture development, particularly the deposition of single-phase magnetite films, has been discussed. In addition, the above-mentioned procedure can also be used to prepare of iron (III) oxide nanorods and nanotubes through the AAO template-mediated process. It is found that the configuration of the electrode assembly can lead to nanorod or nanotube structure; besides, the variation of concentration and deposition time can be used to change the morphology and aspect ratio. The present study not only discussed the growth behavior of nanorod but also explain the deposition of nanotube under specific condition and their microstructure transition. In addition to electrodeposition there is another microstructure appearing simultaneously by chemical precipitation in the solution, i.e., network structure composed of nanosheets. The growth behavior of nanosheets can be studied by changing the deposition parameters (e.g., reaction time, temperature, solution concentration, and/or substrate) and a possible growth mechanism has been proposed. The results indicates that the KCH3COO concentration determines both the nucleation rate and growth rate of the nanosheets, where the network structure cannot be observed due to limited nucleation density of nanosheets at low KCH3COO concentration below a critical limit. On the contrary, the growth rate would be retarded if there is a high nucleation rate for nanosheets which can consume the reactants in the solution during the nucleation period.