|About this Abstract
||Materials Science & Technology 2012
||Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
||Ferromagnetic Zinc Oxide Nanoparticles Prepared by Pulsed Laser Ablation in Liquid
||Chenlin Zhao, Jeremiah T Abiade
|On-Site Speaker (Planned)
Pulsed laser ablation (PLA) of solid targets immersed in liquids has recently been used to synthesize metal and ceramic nanostructures. The PLA method is highly advantageous compared to other techniques because nanoparticle (NP) synthesis is possible without organics or complex precursors. Here we report on the preparation and magnetic properties of ZnO nanoparticles by PLA of a solid zinc oxide (ZnO) target in water. The existence of ZnO is confirmed by energy-dispersive spectroscopy. The particle size (~ 100 nm) was dependent on the laser parameters like energy and frequency and not number of pulses on the target. The samples were also displayed ferromagnetic characteristics at room temperature. The saturation moment of the ZnO NPs is almost unchanged when comparing hysteresis loops obtained between 5K and 300K. So called d0 magnetism has been invoked to explain the magnetic characteristics which is different from traditional ferromagnetic models.