1. 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.