Synthesis and characterisation of silica encapsulated cobalt nanoparticles and nanoparticle chains

A. S. Eggeman*, A. K. Petford-Long, P. J. Dobson, J. Wiggins, T. Bromwich, R. Dunin-Borkowski, T. Kasama

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Nanoparticles of cobalt were produced by direct reduction in aqueous solution. These were subsequently coated in silica by a very slow hydrolysis reaction. Electrostatic and magnetic forces between the nanoparticles led to ordered structures forming, which were analysed by high resolution transmission electron microscopy. SQUID magnetometry showed that the nanoparticles were ferromagnetic with an additional magnetic signal from highly disordered surface states. Off-axis electron holography of the structures was undertaken and gives evidence for the mechanism by which the structures form.

Original languageEnglish (US)
Pages (from-to)336-342
Number of pages7
JournalJournal of Magnetism and Magnetic Materials
Volume301
Issue number2
DOIs
StatePublished - Jun 2006

Keywords

  • Core shell
  • Electron holography
  • Nanoparticles
  • SQUID magnetometry

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint

Dive into the research topics of 'Synthesis and characterisation of silica encapsulated cobalt nanoparticles and nanoparticle chains'. Together they form a unique fingerprint.

Cite this