Monodisperse Au-Fe 3 O 4 heterodimeric nanoparticles (NPs) were prepared by injecting precursors into a hot reaction solution. The size of Au and Fe 3 O 4 particles can be controlled by changing the injection temperature. UV-Vis spectra show that the surface plasma resonance band of Au-Fe 3 O 4 heterodimeric NPs was evidently red-shifted compared with the resonance band of Au NPs of similar size. The as-prepared heterodimeric Au-Fe 3 O 4 NPs exhibited superparamagnetic properties at room

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... ture. The Ag-Fe 3 O 4 heterodimeric NPs were also prepared by this synthetic method simply using AgNO 3 as precursor instead of HAuCl 4 . It is indicated that the reported method can be readily extended to the synthesis of other noble metal conjugated heterodimeric NPs.