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).
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References
Nanoparticles and nanostructured films preparation, characterization and applications edited by J H Fendler (Wiley-VCH, Weinheim, 1998)
S A Majetich and Y Jin, Science 284, 470 (1999)
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)
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)
Physics and chemistry of small clusters edited by P Jena, B K Rao and S N Khanna (Plenum Press, New York, 1987)
C N R Rao, G U Kulkarni, P J Thomas and P P Edwards, Chem. Soc. Rev. 29, 27 (2000)
P J Thomas, G U Kulkarni and C N R Rao, J. Phys. Chem. B104, 8138 (2000)
S Sun and C B Murray, J. Appl. Phys. 85, 4325 (1999)
C Petit and M P Pileni, Appl. Surf. Sci. 162–163, 519 (2000)
S Sun, C B Murray, D Weller, L Folks and A Moser, Science 287, 1989 (2000)
P J Thomas, G U Kularni and C N R Rao, J. Nanosci. Nanotechnol. 1, 267 (2001)
M D Bentzon, J V Wonterghem, S Mörup, A Thölén and C J W Koch, Philos. Mag. B60, 169 (1989)
J S Yin and Z L Wang, Phys. Rev. Lett. 79, 2570 (1997)
Clusters and Colloids: from theory to applications edited by G Schmid (Wiley-VCH, Weinheim, 1995)
K V Sarathy, G U Kulkarni and C N R Rao, Chem. Commun. 573 (1997)
K V Sarathy, G Raina, R T Yadav, G U Kulkarni and C N R Rao, J. Phys. Chem. B101, 9876 (1997)
J Rockenberger, E C Scher and A P Alivisatos, J. Am. Chem. Soc. 121, 11590 (1999)
N H Furman, W B Mason and J S Pekola, Anal. Chem. 21, 1325 (1949)
J R Heath, M C Knobler and D V Leff, J. Phys. Chem. B101, 189 (1997)
R Sappey, E Vincent, N Hadacek, F Chaput, J P Boilot and D Zins, Phys. Rev. B56, 14551 (1997)
B H Sohn and R E Cohen, Chem. Mater. 9, 264 (1997)
X-ray diffraction procedures for crystalline and amorphous solids by H P Klug and L E Alexander (Wiley-Interscience, 1974)
R J Speedy, J. Phys. Condens. Mater 10, 4185 (1998)
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)
O Iglesias and A Labarta, Phys. Rev. B63, 184416 (2001)
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Thomas, P.J., Saravanan, P., Kulkarni, G.U. et al. Arrays of magnetic nanoparticles capped with alkylamines. Pramana - J Phys 58, 371–383 (2002). https://doi.org/10.1007/s12043-002-0021-1
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DOI: https://doi.org/10.1007/s12043-002-0021-1