Gold/Iron Oxide Core/Hollow-Shell Nanoparticles


  • The work at the Molecular Foundry, Lawrence Berkeley National Laboratory, and at the Center for Nanoscale Materials was supported by the Office of Science and Office of Basic Energy Sciences of the U.S. Department of Energy under Contract Nos. DE-AC02-05CH11231 and DE-AC02-06CH11357, respectively. We acknowledge Dr. Jeffrey B. Kortright for helpful discussions. M.I.B., M.V.K., and W.H. acknowledge financial support from the Austrian Science Foundation FWF (Project start Y179) and from the Austrian Nanoinitiative (Project NSI). Supporting Information is available online from Wiley InterScience or from the author.


original image

Gold/iron oxide core/hollow-shell composite nanoparticles (NPs) with controllable shell thicknesses are synthesized (see figure). The gap between the Au core and iron oxide shell is formed as a result of different outward and inward diffusion rates of Fe and O, respectively. Control over interparticle interactions allows encapsulation of several Au cores inside one iron oxide shell. Superparamagnetic measurements of the NPs at room temperature demonstrate the plasmon resonance at 565 nm.