Enio Lima Jr et al 2009 Nanotechnology 20 045606 doi:10.1088/0957-4484/20/4/045606
Enio Lima Jr1, José M Vargas1,6, Roberto D Zysler1,7, Hercilio R Rechenberg2, Renato Cohen2, Jordi Arbiol3, Gerardo F Goya4, Alfonso Ibarra4 and M Ricardo Ibarra4,5
Show affiliationsWe report a single-step chemical synthesis of iron oxide hollow nanospheres with 9.3 nm in diameter. The sample presents a narrow particle diameter distribution and chemical homogeneity. The hollow nature of the particles is confirmed by HRTEM and HAADF STEM analysis. Electron and x-ray diffraction show that the outer material component is constituted by 2 nm ferrite crystals. Mössbauer data provide further evidence for the formation of iron oxide with high structural disorder, magnetically ordered at 4.2 K and superparamagnetism at room temperature. An unusual magnetic behavior under an applied field is reported, which can be explained by the large fraction of atoms existing at both inner and outer surfaces.
81.16.Be Chemical synthesis methods
75.75.+a Magnetic properties of nanostructures
75.50.Tt Fine-particle systems; nanocrystalline materials
76.80.+y Mössbauer effect; other γ-ray spectroscopy
81.07.-b Nanoscale materials and structures: fabrication and characterization
Issue 4 (28 January 2009)
Received 10 October 2008, in final form 14 November 2008
Published 19 December 2008
Enio Lima Jr et al 2009 Nanotechnology 20 045606
Rémy Mosseri and Rossen Dandoloff 2001 J. Phys. A: Math. Gen. 34 10243
Andrew N Round and Mervyn J Miles 2004 Nanotechnology 15 S176
Massimo Antognozzi et al 2006 Nanotechnology 17 3897
David J Siminovitch and Simon Habot 1997 J. Phys. A: Math. Gen. 30 2577
S G Schirmer et al 2004 J. Phys. A: Math. Gen. 37 1389
J T Lin and T F Jiang 2000 J. Phys. B: At. Mol. Opt. Phys. 33 3023
J C Camparo and R P Frueholz 1984 J. Phys. B: At. Mol. Phys. 17 4169
Witold Chałupczak and Krzysztof Szymaniec 2006 J. Phys. B: At. Mol. Opt. Phys. 39 1081
Bogdan A Bernevig and Han-Dong Chen 2003 J. Phys. A: Math. Gen. 36 8325