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Issue Eur. Phys. J. Appl. Phys.
Volume 44, Number 1, October 2008
10th Meeting of the French Microscopy Society
Page(s) 3 - 9
Section Imaging, Microscopy and Spectroscopy
DOI 10.1051/epjap:2008051
Published online 23 April 2008

Eur. Phys. J. Appl. Phys. 44, 3-9 (2008)
DOI: 10.1051/epjap:2008051

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

D. Babonneau, D. Lantiat, S. Camelio, J. Toudert, L. Simonot, F. Pailloux, M.-F. Denanot and T. Girardeau

Laboratoire PHYMAT, UMR 6630 CNRS, Université de Poitiers, SP2MI, Téléport 2, Bd M. et P. Curie, BP 30179, 86962 Futuroscope Chasseneuil Cedex, France

david.babonneau@univ-poitiers.fr

Received: 18 June 2007 / Received in final form: 17 December 2007 / Accepted: 22 February 2008 / Published online: 23 April 2008

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.

PACS
81.07.-b - Nanoscale materials and structures: fabrication and characterization.
68.37.Lp - Transmission electron microscopy (TEM).
78.67.-n - Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures.

© EDP Sciences 2008


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