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M.S. Defense Wednesday, May 16, 2007 A277 Bourns Hall 10:00AM Title: Electrochemical Synthesis of Core-Shell Nanostructured Materials Abstract: The results of anodized alumina template fabrication and metallic, semiconducting, and polymer nanowires are discussed in this presentation. The main part of my presentation, I introduce two different methods to fabricate core-shell nanowires, polyaniline (PANI) and polymethyl methacrylate (PMMA). In alumina template fabrication, I analyze the dependence of temperature, current or voltage under different working condition which causes different pore size which is ~ 50 to 70nm and structures. Moreover, I have synthesized Au, Ag, ZnO, CdTe, Co, and PANI nanowires. For core-shell parts, PANI is one of semi-flexible polymers. It shrinks upon drying and can be removed by plasma etching. According to these two properties, PANI can be served as sacrificial template to deposit other materials. Due to the challenges of fabricating PANI, such us time consuming, deposition rate control and yield, PMMA provides an alternative method to fabricate core-shell nanowires. However, the most important part of using PMMA is more physical techniques demanding, totally different from those normal processes of electrochemical deposition. The concentration of PMMA and pore size of alumina membrane are two parameters to manipulate the thickness of PMMA shell. Because PMMA can be etched by acetone, it has a great potential to deposit other materials, even used for applications. The concepts of core-shell nanowires will be extended to potential regenerative fuel cells and three layers of core-shell nanowires applications. |
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