Single-step chemical synthesis of ferrite hollow nanospheres.
We 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.
Lima
Enio
E
Centro Atómico Bariloche and Instituto Balseiro, 8400 SC de Bariloche, RN, Argentina.
Vargas
José M
JM
Zysler
Roberto D
RD
Rechenberg
Hercilio R
HR
Cohen
Renato
R
Arbiol
Jordi
J
Goya
Gerardo F
GF
Ibarra
Alfonso
A
Ibarra
M Ricardo
MR