Nano Research

, Volume 2, Issue 5, pp 380–385 | Cite as

Synthesis of high magnetic moment CoFe nanoparticles via interfacial diffusion in core/shell structured Co/Fe nanoparticles

  • Chao Wang
  • Sheng Peng
  • Lise-Marie Lacroix
  • Shouheng Sun
Open Access
Research Article


We report the synthesis of high magnetic moment CoFe nanoparticles via the diffusion of Co and Fe in core/shell structured Co/Fe nanoparticles. In an organic solution, Co nanoparticles were coated with a layer of Fe to form a Co/Fe core/shell structure. Further raising the solution temperature led to inter-diffusion of Co and Fe and formation of CoFe alloy nanoparticles. These nanoparticles have high saturation magnetization of up to 192 emu/g CoFe and can be further stabilized by thermal annealing at 600 °C.


CoFe nanoparticles core/shell nanoparticles magnetic nanoparticles chemical synthesis 

Supplementary material

12274_2009_9037_MOESM1_ESM.pdf (173 kb)
Supplementary material, approximately 340 KB.


  1. [1]
    Sun, S.; Murray, C. B.; Weller, D.; Folks, L.; Moser, A. Monodisperse FePt nanoparticles and ferromagnetic FePt nanocrystal superlattices. Science 2000, 287, 1989–1992.CrossRefPubMedADSGoogle Scholar
  2. [2]
    Lacheisserie, E. T.; Gignoux, D.; Schlenker, M. Magnetism: Materials and Spplications; Springer, 2004.Google Scholar
  3. [3]
    Bader, S. D. Colloquium: Opportunities in nanomagnetism. Rev. Mod. Phys. 2006, 78, 1–15.CrossRefADSGoogle Scholar
  4. [4]
    Lu, A.-H.; Salabas, E. L.; Schüth, F. Magnetic nanoparticles: Synthesis, protection, functionalization, and application. Angew. Chem. Int. Ed. 2007, 46, 1222–1244.CrossRefGoogle Scholar
  5. [5]
    Lewin, M.; Carlesso, N.; Tung, C. -H.; Tang, X. -W.; Cory, D.; Scadden, D. T.; Weissleder, R. Tat peptide-derivatized magnetic nanoparticles allow in vivo tracking and recovery of progenitor cells. Nat. Biotechnol. 2000, 22, 47–52.Google Scholar
  6. [6]
    Zhao, M.; Deauregard, D. A.; Loizou, L.; Davletov, B.; Brindle, K. M. Non-invasive detection of apoptosis using magnetic resonance imaging and a targeted contrast agent. Nat. Med. 2001, 7, 1241–1244.CrossRefPubMedGoogle Scholar
  7. [7]
    Seo, W. S.; Lee, J. H.; Sun, X.; Suzuki, Y.; Mann, D.; Liu, Z.; Terashima, M.; Yang, P. C.; Mcconnell, M. V.; Nishimura, D. G.; Dai, H. FeCo/graphitic-shell nanocrystals as advanced magnetic-resonance-imaging and near-infrared agents. Nat. Mater. 2006, 5, 971–976.CrossRefPubMedADSGoogle Scholar
  8. [8]
    Peng, S.; Wang, C.; Xie, J.; Sun, S. Synthesis and stabilization of monodisperse Fe nanoparticles. J. Am. Chem. Soc. 2006, 128, 10676–10677.CrossRefPubMedGoogle Scholar
  9. [9]
    Xu, C.; Xie, J.; Ho, D.; Wang, C.; Kohler, N.; Walsh, E. G.; Morgan, J. R.; Chin, Y. E.; Sun, S. Au Fe3O4 dumbbell nanoparticles as dual-functional Probes. Angew. Chem. Int. Ed. 2008, 47, 173–176.CrossRefGoogle Scholar
  10. [10]
    Sun, C.; Lee, J.; Zhang, M. Magnetic nanoparticles in MR imaging and drug delivery. Adv. Drug Deliv. Rev. 2008, 60, 1252–1265.CrossRefPubMedGoogle Scholar
  11. [11]
    Desvaux, C.; Amiens, C.; Fejes, P.; Renaud, P.; Respaud, M.; Lecante, P.; Snoeck, E.; Chaudret, B. Multimillimetrelarge superlattices of air-stable iron-cobalt nanoparticles. Nat. Mater. 2005, 4, 750–753.CrossRefPubMedADSGoogle Scholar
  12. [12]
    Chaubey, G. S.; Barcena, C.; Paudyal, N.; Rong, C.; Gao, J.; Sun, S.; Liu, J. P. Synthesis and stabilization of FeCo nanoparticles. J. Am. Chem. Soc. 2007, 129, 7214–7215.CrossRefPubMedGoogle Scholar
  13. [13]
    Kim, J.; Rong, C.; Lee, Y.; Liu, J. P.; Sun, S. From core/shell structured FePt/FeO/MgO to ferromagnetic FePt nanoparticles. Chem. Mater. 2008, 20, 7242–7245.CrossRefGoogle Scholar
  14. [14]
    Wang, C.; Peng, S.; Chan, R.; Sun, S. Synthesis of AuAg alloy nanoparticles from core/shell structured Ag/Au. Small, in press, DOI:10.1002/smll.200801169.Google Scholar
  15. [15]
    Hütten, A.; Sudfeld, D.; Ennen, I.; Reiss, G.; Wojczykowski, K.; Jutzi, P. Ferromagnetic FeCo nanoparticles for biotechnology. J. Mag. Mag. Mater. 2005, 293, 93–101.CrossRefADSGoogle Scholar

Copyright information

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • Chao Wang
    • 1
  • Sheng Peng
    • 1
  • Lise-Marie Lacroix
    • 1
  • Shouheng Sun
    • 1
  1. 1.Department of ChemistryBrown UniversityProvidenceUSA

Personalised recommendations