Structural characterization and self-assembly into superlattices of iron oxide-gold core-shell nanoparticles synthesized via a high-temperature organometallic route

I. Chen Chiang, Dong-Hwang Chen

研究成果: Article同行評審

8 引文 斯高帕斯(Scopus)

摘要

Iron oxide-gold core-shell nanocrystals have been synthesized by the thermal decomposition of iron pentacarbonyl and the subsequent reduction of gold acetate by 1,2-hexadecanediol with oleic acid and oleylamine as stabilizers. Their size, structure, composition, and optical and magnetic properties were characterized. The resultant nanoparticles were nearly monodisperse with a complete core-shell structure, and the shell thickness could be tuned via the seed-mediated growth. Also, they exhibited an absorption band at 520 nm owing to the surface plasmon resonance of Au shells and were nearly superparamagnetic due to the presence of the iron cores. By analyzing the x-ray adsorption near-edge structure (XANES) spectrum and the x-ray photoelectron spectroscopy (XPS) spectra of the fast etching mode, the iron cores were shown to be oxidized but the oxidation was incomplete in the inner region. Noteworthily, the iron oxide-Au nanoparticles could self-assemble into 2D and 3D superlattices. The packing density increased while approaching the center of assembly, leading to the variation of superstructures from a 2D nearly hcp monolayer to a 3D hcp superlattice and a 3D hexagonal superlattice. Moreover, hydrophilic iron oxide-Au core-shell nanoparticles were also obtained by surface modification with mercaptoacetic acid via a phase transfer route.

原文English
文章編號015602
期刊Nanotechnology
20
發行號1
DOIs
出版狀態Published - 2009 一月 7

All Science Journal Classification (ASJC) codes

  • 生物工程
  • 化學 (全部)
  • 電氣與電子工程
  • 機械工業
  • 材料力學
  • 材料科學(全部)

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