Cubic silica-coated and amine-functionalized FeCo nanoparticles with high saturation magnetization

Arati G. Kolhatkar, Ivan Nekrashevich, Dmitri Litvinov, Richard C. Willson, T. Randall Lee

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

By systematically varying the reaction parameters in a liquid-phase reduction reaction, large FeCo nanocubes with tunable body diagonal lengths of 175, 350, and 450 nm were synthesized. The nanocubes were initially stabilized with poly(vinyl pyrrolidone) (PVP) and then coated with a relatively thin layer of silica (∼55 nm thick), which allowed them to retain their cubic shape. The magnetization curves showed that the PVP-stabilized nanocubes exhibited a high saturation magnetization of 167 ± 4 emu/g. The saturation magnetization, however, decreased upon coating with silica to 146 ± 13 emu/g for the particles with 350 and 450 nm FeCo cores and 48 ± 1 emu/g for the particles with 175 nm FeCo cores. The silica-coated FeCo nanocubes were then functionalized with 3-(aminopropyl)trimethoxysilane (APTMS), and a layer of surface-bound nanoparticle was generated by exposing the resultant amine-functionalized nanocubes to self-assembled monolayers (SAMs) on gold terminated with carboxylic-acid groups.

Original languageEnglish (US)
Pages (from-to)1092-1097
Number of pages6
JournalChemistry of Materials
Volume25
Issue number7
DOIs
StatePublished - Apr 9 2013

Keywords

  • amine-functionalized
  • biosensor
  • cubic
  • FeCo
  • nanocube
  • nanoparticle
  • saturation magnetization
  • silica-coated

ASJC Scopus subject areas

  • Materials Chemistry
  • Chemical Engineering(all)
  • Chemistry(all)

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