Article

Optical and electrical properties of colloidal (spherical Au)-(spinel ferrite nanorod) heterostructures.

Istituto Italiano di Tecnologia, Via Morego 30, 16163, Genova, Italy.
Nanoscale (impact factor: 5.91). 09/2011; 3(11):4647-54. DOI:10.1039/c1nr10768b pp.4647-54
Source: PubMed

ABSTRACT We report here a simple synthetic route to Au-Fe(x)O(y) heterostructures in which spinel ferrite (Fe(x)O(y)) grows as a nanorod on a spherical gold (Au) seed. The large red shift in the plasmon resonance in the heterostructures could be explained by a dielectric effect (although we could not entirely exclude a contribution due to electron transfer from Au to defect states at the Au-Fe(x)O(y) interface), while the magnetic properties of the Au-Fe(x)O(y) heterostructures were basically the same as those of the corresponding nanocrystals after Au leaching. In films of Au-Fe(x)O(y) heterostructures the electrical conductivity appeared to be mediated by the Au domains.

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Keywords

electrical conductivity
 
electron transfer
 
large red shift
 
magnetic properties
 
nanorod
 
plasmon resonance
 
spherical gold
 
spinel ferrite