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Gold and silver nanoparticles embedded in dielectric-capping layers studied by HAADF-STEM

Published online by Cambridge University Press:  23 April 2008

D. Babonneau*
Affiliation:
Laboratoire PHYMAT, UMR 6630 CNRS, Université de Poitiers, SP2MI, Téléport 2, Bd M. et P. Curie, BP 30179, 86962 Futuroscope Chasseneuil Cedex, France
D. Lantiat
Affiliation:
Laboratoire PHYMAT, UMR 6630 CNRS, Université de Poitiers, SP2MI, Téléport 2, Bd M. et P. Curie, BP 30179, 86962 Futuroscope Chasseneuil Cedex, France
S. Camelio
Affiliation:
Laboratoire PHYMAT, UMR 6630 CNRS, Université de Poitiers, SP2MI, Téléport 2, Bd M. et P. Curie, BP 30179, 86962 Futuroscope Chasseneuil Cedex, France
J. Toudert
Affiliation:
Laboratoire PHYMAT, UMR 6630 CNRS, Université de Poitiers, SP2MI, Téléport 2, Bd M. et P. Curie, BP 30179, 86962 Futuroscope Chasseneuil Cedex, France
L. Simonot
Affiliation:
Laboratoire PHYMAT, UMR 6630 CNRS, Université de Poitiers, SP2MI, Téléport 2, Bd M. et P. Curie, BP 30179, 86962 Futuroscope Chasseneuil Cedex, France
F. Pailloux
Affiliation:
Laboratoire PHYMAT, UMR 6630 CNRS, Université de Poitiers, SP2MI, Téléport 2, Bd M. et P. Curie, BP 30179, 86962 Futuroscope Chasseneuil Cedex, France
M.-F. Denanot
Affiliation:
Laboratoire PHYMAT, UMR 6630 CNRS, Université de Poitiers, SP2MI, Téléport 2, Bd M. et P. Curie, BP 30179, 86962 Futuroscope Chasseneuil Cedex, France
T. Girardeau
Affiliation:
Laboratoire PHYMAT, UMR 6630 CNRS, Université de Poitiers, SP2MI, Téléport 2, Bd M. et P. Curie, BP 30179, 86962 Futuroscope Chasseneuil Cedex, France
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Abstract

The morphology and optical response of Au and Ag nanoparticles capped with dielectric amorphous Si3N4, BN, and Al2O3 layers are studied. Quantitative analysis of high-angle annular dark-field images obtained in a scanning transmission electron microscope and simulations of optical transmittance spectra are used to investigate the dependence of the morphology of the nanoparticles on the particle size and on the capping material. It is demonstrated that capping-layer effects induce a size-dependent and cap-dependent reshaping of the nanoparticles.

Keywords

Type
Research Article
Copyright
© EDP Sciences, 2008

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