| About this Abstract |
| Meeting |
2010 TMS Annual Meeting & Exhibition
|
| Symposium
|
2010 Functional and Structural Nanomaterials: Fabrication, Properties, Applications and Implications
|
| Presentation Title |
Controlling Composition at the Individual FePt Nanoparticle Level |
| Author(s) |
Chandan Srivastava, David E Nikles, Gregory B Thompson |
| On-Site Speaker (Planned) |
Gregory B Thompson |
| Abstract Scope |
The self assembly of FePt nanoparticles is proposed as a candidate architecture for achieving ultra high magnetic storage. An outstanding issue is the compositional and size variation between individual nanoparticles. This research will demonstrate that a two-step nucleation process of Pt seeds with the subsequent heterogeneous nucleation of Fe from organo-metallic or salt precursors can significantly reduce the composition and size distribution between individual nanoparticles. This two-step process, and the narrowing of these distributions, has been demonstrated in two separate FePt synthesis techniques: the thermal decomposition of Fe(CO)5 or reduction of FeCl2 with Pt(acac) precursors. The results are explained in terms of a Monte Carol free energy simulation. Individual nanoparticle chemistry has been quantified using STEM-EDX analysis. The results demonstrate how mechanistic nucleation and growth control can be used to tune multi-component nanoparticles. |
| Proceedings Inclusion? |
Undecided |