| Summary: | 碩士 === 國立中正大學 === 化學工程所 === 95 === This study is to investigate the characteristic of nickel electroplating in supercritical carbon dioxide (SC-CO2) electroplating process, and to apply this technology to produce Ni-nanowires in anodic aluminum oxide template. It is found that the Ni-film is polycrystalline structure and grain size of the Ni-film decrease with increasing pressure under SC-CO2 electroplating. The reasons could be attributed to: (i) pressure can induce nucleation rate and (ii) the emulsified electrolyte by SC-CO2 acts like pulsation electroplating, leading to a decrease in grain size. In addition, because fine grain size and reduce porosity of the Ni-film under SC-CO2 electroplating. The hardness of the Ni-film in the pressure 10.2MPa to reach 8.29GPa and is about four-time higher than that by ambient electroplating (2GPa). Due to SC-CO2 having the advantages of low surface tension and high mass transfer, the electrolyte can be brought into nanopores, leading to an enhancement of the Ni-nanowire filling rate in anodic aluminum oxide template. Ni-nanowire and Ni-film is like polycrystalline structure and also decreases with increasing pressure. Both of produced Ni-film and Ni-nanowire have the same decreasing trend in coercive field and squareness ratio as increasing pressure.
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