Co–Au core-shell nanocrystals formed by sequential ion implantation into SiO₂
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Kluth, P.
Hoy, B.
Johannessen, B.
Dunn, S. G.
Foran, G. J.
Ridgway, M. C.
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American Institute of Physics (AIP)
Abstract
Co–Au core-shell nanocrystals (NCs) were formed by sequential ion implantation of Au and Co into thin SiO₂. 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. Increased Debye-Waller factors indicate significant strain in the NCs. These experimental results verify recent theoretical predictions.
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Applied Physics Letters
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