Supported by Wang Dao Project (UROP)

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Presentation transcript:

Supported by Wang Dao Project (UROP) Synthesis of LaPrCaMnO3 nanowires by Porous Anodic Alumina & Sol-Gel methods Qiang Zhang (2008 Undergraduate) Supervisor: Jian Shen, Lifeng Yin Emergent phenomena under spatial confinement Multi-phases in single crystal Electron Phase Separation in 1-100nm Disparate electro-magnetic properties Phase transformation responding to temperature and other parameters Electronic phase separation Insulator Metal Porous Anodic Alumina & Sol-Gel methods Traditional methods Complex Oxides B 50 mm V A Spatial confinement Nano fabrication Epitaxial thin film Laser MBE RHEED XRD STM Alumina templates Lithography Nanotechnology 15,1312 (2004) Certain chemical component for Sol Gel in the PAA hole:350K,12h Anneal : 870K,18h Solution and centrifugal>24h collection Properties characterized by XRD/TEM/SEM Explore the transport properties for the EPS Immerging in NaOH Porous Anodic Alumina & Sol-Gel methods * Lower synthesis temperature * Tunable stoichiometry * Tunable size * Ordered array * ex-situ SEM LPCMO nanowires in PAA templates (as grown) XRD 20000× 40000× 20000× 20000× Linear structure Nano hole Gel in the hole Nanowires LPCMO nanowires (after PAA templates dissolved) Summary Successfully synthesize LaPrCaMnO3 nanowires by Porous Anodic Alumina & Sol-Gel methods. Effective approach for high productivity and quantified orientation is on the way.