We report here a simple synthetic route to Au-Fe xO y heterostructures in which spinel ferrite (Fe xO 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 xO y interface), while the magnetic properties of the Au-Fe xO y heterostructures were basically the same as those of the corresponding nanocrystals after Au leaching. In films of Au-Fe xO y heterostructures the electrical conductivity appeared to be mediated by the Au domains.
ASJC Scopus subject areas
- Materials Science(all)