Synthesis of highly magnetic graphite-encapsulated FeCo nanoparticles using a hydrothermal process

Seung Jae Lee, Jee Hyun Cho, Chulhyun Lee, Janggeun Cho, Yong Rok Kim, Joung Kyu Park

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

The graphite encapsulation of metal alloy magnetic nanoparticles has attracted attention for biological applications because of the high magnetization of the encapsulated particles. However, most of the synthetic methods have limitations in terms of scalability and economics because of the demanding synthetic conditions and low yields. Here, we show that well controlled graphite-encapsulated FeCo core-shell nanoparticles can be synthesized by a hydrothermal method, simply by mixing Fe/Co with sucrose as a carbon source. Various Fe/Co metal ratios were used to determine the compositional dependence of the saturation magnetization and relaxivity coefficient. Transmission electron microscopy indicated that the particle sizes were 7nm. In order to test the capability of graphite-encapsulated FeCo nanoparticles as magnetic resonance imaging (MRI) contrast agents, these nanoparticles were solubilized in water by the nonspecific physical adsorption of sodium dodecylbenzene sulfonate.

Original languageEnglish
Article number375603
JournalNanotechnology
Volume22
Issue number37
DOIs
Publication statusPublished - 2011 Sep 16

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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