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Co-Au core-shell nanocrystals ͑NCs͒ were formed by sequential ion implantation of Au and Co into thin SiO 2 . The NCs were investigated by means of transmission electron microscopy and extended x-ray absorption fine structure spectroscopy. The latter reveals a bond length expansion in the Co core compared to monatomic Co NCs. Concomitantly, a significant contraction of the bond length and a significant reduction of the effective Au-Au coordination number were observed in the Au shells.doi:10.1063/1.2360891 fatcat:skqckeu4obcsjgtjctq5wk5xim