Advertisement

Pramana

, Volume 58, Issue 2, pp 371–383 | Cite as

Arrays of magnetic nanoparticles capped with alkylamines

  • P John Thomas
  • P Saravanan
  • G U Kulkarni
  • CNR RaoEmail author
Article

Abstract

Magnetic metal and metal oxide nanoparticles capped with alkylamines have been synthesized and characterized by transmission electron microscopy. X-ray diffraction, energy dispersive X-ray analysis and magnetization measurements. Core-shell Pd-Ni particles with composition, Pd561Ni3000, (diameter ∼3.3 nm) are superparamagnetic at 5 K and organize themselves into two-dimensional crystalline arrays. Similar arrays are obtained with Pd561Ni3000Pd1500 nanoparticles containing an additional Pd shell. Magnetic spinel particles of γ-Fe2O3, Fe3O4 and CoFe2O4 of average diameters in the 4–6 nm range coated with octylamine are all supermagnetic at room temperature and yield close-packed disordered arrays. Relatively regular arrays are formed by dodecylaminecapped Fe3O4 nanoparticles (∼8.6 nm diameter) while well-ordered hexagonal arrays were obtained with octylamine-covered Co3O4 nanoparticles (∼4.2 nm diameter).

Keywords

Self-assembly magnetic nanoparticles 

PACS Nos

81.16.D 81.07.Bc 81.16.B 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. [1]
    Nanoparticles and nanostructured films preparation, characterization and applications edited by J H Fendler (Wiley-VCH, Weinheim, 1998)Google Scholar
  2. [2]
    S A Majetich and Y Jin, Science 284, 470 (1999)CrossRefADSGoogle Scholar
  3. [3]
    C H Back, R Allenspach, W Weber, S S P Parkin, D Weller, E L Garwin and H C S Siegmann, Science 285, 864 (1999)CrossRefGoogle Scholar
  4. [4]
    P P Edwards, R L Johnston and C N R Rao in Metal clusters in chemistry edited by P. Braunstein, G Oro and P R Raithby (Wiely-VCH, New York, 2000)Google Scholar
  5. [5]
    Physics and chemistry of small clusters edited by P Jena, B K Rao and S N Khanna (Plenum Press, New York, 1987)Google Scholar
  6. [6]
    C N R Rao, G U Kulkarni, P J Thomas and P P Edwards, Chem. Soc. Rev. 29, 27 (2000)CrossRefGoogle Scholar
  7. [7]
    P J Thomas, G U Kulkarni and C N R Rao, J. Phys. Chem. B104, 8138 (2000)Google Scholar
  8. [8]
    S Sun and C B Murray, J. Appl. Phys. 85, 4325 (1999)CrossRefADSGoogle Scholar
  9. [9]
    C Petit and M P Pileni, Appl. Surf. Sci. 162–163, 519 (2000)CrossRefGoogle Scholar
  10. [10]
    S Sun, C B Murray, D Weller, L Folks and A Moser, Science 287, 1989 (2000)CrossRefADSGoogle Scholar
  11. [11]
    P J Thomas, G U Kularni and C N R Rao, J. Nanosci. Nanotechnol. 1, 267 (2001)CrossRefGoogle Scholar
  12. [12]
    M D Bentzon, J V Wonterghem, S Mörup, A Thölén and C J W Koch, Philos. Mag. B60, 169 (1989)Google Scholar
  13. [13]
    J S Yin and Z L Wang, Phys. Rev. Lett. 79, 2570 (1997)CrossRefADSGoogle Scholar
  14. [14]
    Clusters and Colloids: from theory to applications edited by G Schmid (Wiley-VCH, Weinheim, 1995)Google Scholar
  15. [15]
    K V Sarathy, G U Kulkarni and C N R Rao, Chem. Commun. 573 (1997)Google Scholar
  16. [16]
    K V Sarathy, G Raina, R T Yadav, G U Kulkarni and C N R Rao, J. Phys. Chem. B101, 9876 (1997)Google Scholar
  17. [17]
    J Rockenberger, E C Scher and A P Alivisatos, J. Am. Chem. Soc. 121, 11590 (1999)CrossRefGoogle Scholar
  18. [18]
    N H Furman, W B Mason and J S Pekola, Anal. Chem. 21, 1325 (1949)CrossRefGoogle Scholar
  19. [19]
    J R Heath, M C Knobler and D V Leff, J. Phys. Chem. B101, 189 (1997)Google Scholar
  20. [20]
    R Sappey, E Vincent, N Hadacek, F Chaput, J P Boilot and D Zins, Phys. Rev. B56, 14551 (1997)ADSGoogle Scholar
  21. [21]
    B H Sohn and R E Cohen, Chem. Mater. 9, 264 (1997)CrossRefGoogle Scholar
  22. [22]
    X-ray diffraction procedures for crystalline and amorphous solids by H P Klug and L E Alexander (Wiley-Interscience, 1974)Google Scholar
  23. [23]
    R J Speedy, J. Phys. Condens. Mater 10, 4185 (1998)CrossRefADSGoogle Scholar
  24. [24]
    M P Morales, S Veintemillas-Verdaguer, M I Montero, C J Serna, A Roig, Li Casas, B Martinez and F Sandiumenge, Chem. Mater. 11, 3058 (1999)CrossRefGoogle Scholar
  25. [25]
    O Iglesias and A Labarta, Phys. Rev. B63, 184416 (2001)ADSGoogle Scholar

Copyright information

© Indian Academy of Sciences 2002

Authors and Affiliations

  • P John Thomas
    • 1
  • P Saravanan
    • 1
  • G U Kulkarni
    • 1
  • CNR Rao
    • 1
    Email author
  1. 1.Chemistry and Physics of Materials UnitJawaharlal Nehru Centre for Advanced Scientific Research, JakkurBangaloreIndia

Personalised recommendations