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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal align=center style='text-align:center;line-height:normal'><span style='font-size:14.0pt;font-family:"Times New Roman","serif"'>MASTER’S THESIS DEFENSE<o:p></o:p></span></p><p class=MsoNormal align=center style='text-align:center;line-height:normal'><span style='font-size:14.0pt;font-family:"Times New Roman","serif"'>FABRICATION OF NANOWIRES BY CHEMICAL VAPOR DEPOSITION FOR PINNING IN SUPERCONDUCTING FILMS<o:p></o:p></span></p><p class=MsoNormal align=center style='margin-bottom:0in;margin-bottom:.0001pt;text-align:center;line-height:200%'><span style='font-size:12.0pt;line-height:200%;font-family:"Times New Roman","serif"'>Xin Tao<o:p></o:p></span></p><p class=MsoBodyText align=center style='text-align:center;line-height:200%'><span class=apple-style-span><span style='font-family:"Times New Roman","serif";color:black'>November 18<sup>th</sup>, 9:30 am, Chemical Engineering conference room, S234</span></span><o:p></o:p></p><p class=MsoNormal align=center style='margin-bottom:0in;margin-bottom:.0001pt;text-align:center;line-height:200%'><b><span style='font-size:12.0pt;line-height:200%;font-family:"Times New Roman","serif"'>Committee Members: </span></b><span style='font-family:"Times New Roman","serif"'>Venkat Selvamanickam, Professor, Mechanical Engineering, Li Sun, Associate Professor, Mechanical Engineering, Jiming Bao, Assistant Professor, Electrical and Computer Engineering<o:p></o:p></span></p><p class=MsoNormal align=center style='text-align:center;line-height:normal'><span style='font-size:16.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p><p class=MsoNormal style='text-align:justify;text-indent:.5in;line-height:200%'><span style='font-size:12.0pt;line-height:200%;font-family:"Times New Roman","serif"'>ZnO and SnO<sub>2</sub> nanowires have been pre-synthesized on the surface of buffer layers prior to deposition of superconducting thin films in order to pin magnetic flux lines. After deposition of REBCO superconducting film, samples embedded with ZnO nanowires showed low critical current and depressed transition temperature, indicating the incompatibility between ZnO and REBCO. On the other hand, the out-of-plane SnO<sub>2</sub> nanowires synthesized in single-step VLS method were all found to be accompanied by in-plane wire-like nanostructures, which may impede the epitaxial growth of superconducting film. Two methods, which involve two-step growth and ion-bombardment of SnO<sub>2 </sub>nanowires, have been explored to remove the in-plane structures. After deposition of superconducting film, decent critical current (<i>I<sub>c</sub></i>) over 200A and non-suppressed transition temperature were obtained in ion-bombarded SnO<sub>2</sub> nanowire samples. High <i>H ¡ab</i> to <i>H ¡c</i> ratio and lower rate of reduction of <i>I<sub>c</sub></i> in higher field indicated possible flux pinning from SnO<sub>2 </sub>nanowires.<o:p></o:p></span></p></div></body></html>