Co-Au core-shell nanocrystals formed by sequential ion implantation into SiO{sub 2}

Co-Au core-shell nanocrystals formed by sequential ion implantation into SiO{sub 2}

Co-Au core-shell nanocrystals (NCs) were formed by sequential ion implantation of Au and Co into thin SiO{sub 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 cor...

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Veröffentlicht in:Applied physics letters 2006-10, Vol.89 (15)
Hauptverfasser: Kluth, P., Hoy, B., Johannessen, B., Dunn, S. G., Foran, G. J., Ridgway, M. C., Australian Nuclear Science and Technology Organization, Menai, NSW 2234, Department of Electronic Materials Engineering, Australian National University, Canberra ACT 0200
Format: Artikel
Sprache:eng
Schlagworte:
ABSORPTION SPECTROSCOPY
BOND LENGTHS
COBALT
COORDINATION NUMBER
DEBYE-WALLER FACTOR
FINE STRUCTURE
GOLD
ION IMPLANTATION
MATERIALS SCIENCE
NANOSTRUCTURES
SILICON OXIDES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY SPECTROSCOPY
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Zusammenfassung:Co-Au core-shell nanocrystals (NCs) were formed by sequential ion implantation of Au and Co into thin SiO{sub 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. Increased Debye-Waller factors indicate significant strain in the NCs. These experimental results verify recent theoretical predictions.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2360891