Optical study of Langmuir-Schaeffer films of gold colloid nanoparticles

NABOK, A. V., HERIOT, S. Y. and RICHARDSON, T. H. (2005). Optical study of Langmuir-Schaeffer films of gold colloid nanoparticles. IEEE Transactions on Nanotechnology, 242 (4), 797-802.

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Link to published version:: 10.1109/TNANO.2003.808514

Abstract

Thin films of 5 nm gold colloid nanoparticles were deposited onto solid substrates (silicon, glass, gold coated glass) by the Langmuir-Schaeffer (LS) method at a surface pressure of 10 mN/m. The films produced were characterised with optical techniques of UV-visible absorption spectroscopy, surface plasmon resonance (SPR), and spectroscopic ellipsometry. Film thickness was found to increase linearly with the increase in the number of layers, yielding the values of 2.5 nm and 5.2 nm per deposition stroke for LB and LS films, respectively. Gold colloid films produce SPR curves broadened and shifted to the larger angles in respect to SPR of evaporated gold, which may be related to the effect of quantum confinement of electrons in gold colloid particles. Fitting of both SPR and ellipsometry data yields the value of 7 nm for the Au particles size, which is close to the values obtained by AFM. We also report on the reduction in the effective thickness of evaporated gold films after depositing gold colloid on top.

Item Type: Article
Additional Information: 9th European Conference on Organised Films (ECOF2004) JUL 22-25, 2004, Valladolid, SPAIN
Research Institute, Centre or Group: Materials and Engineering Research Institute > Thin Films Research Centre > Electronic Materials and Sensors Research Group
Identification Number: 10.1109/TNANO.2003.808514
Depositing User: Ann Betterton
Date Deposited: 31 Mar 2010 17:24
Last Modified: 31 Mar 2010 17:24
URI: http://shura.shu.ac.uk/id/eprint/1435

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