Formation of Highly Ordered Alloy Nanoparticles Based on Precursor-Filled Latex Spheres
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- 作者：Achim Manzke ; Alfred Plettl ; Ulf Wiedwald ; Luyang Han ; Paul Ziemann ; Eyk Schreiber ; Ulrich Ziener ; Nicolas Vogel ; Clemens K. Weiss ; Katharina Landfester ; Kai Fauth ; Johannes Biskupek ; Ute Kaiser
- 刊名：Chemistry of Materials
- 出版年：2012
- 出版时间：March 27, 2012
- 年：2012
- 卷：24
- 期：6
- 页码：1048-1054
- 全文大小：371K
- 年卷期：v.24,no.6(March 27, 2012)
- ISSN：1520-5002
文摘
An experimental approach is presented, allowing the preparation of substrate supported, hexagonally arranged metallic alloy nanoparticles with narrow size distributions, well-defined interparticle distances, and controlled chemical composition. The method is based on miniemulsion polymerization and isotropic plasma etching. Polystyrene (PS) and poly(methyl methacrylate) (PMMA) colloids鈥攊n the present study containing Fe- and Pt-precursor complexes in a predefined ratio鈥攁re deposited onto hydrophilic Si/SiO2 substrates by dip-coating, forming a highly ordered monolayer. Contrary to colloidal lithography, here, precursor-filled polystyrene colloids serve as carriers for the alloy forming elements. After reactive ion etching and annealing, hexagonally ordered arrays of crystalline FePt nanoparticles are formed exhibiting the desired 1:1 Fe鈥揚t ratio, as revealed by detailed analysis after each preparation step. Formation of stoichiometric binary alloy FePt nanoparticles is confirmed by determining magnetic hysteresis loops, as well as applying aberration-corrected high-resolution transmission electron microscopy.