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Publication 567
Colloids
and Surfaces A: Physicochemical and Engineering
Aspects, 218 (1-3), 225-239, 2003
DOI: 10.1016/S0927-7757(02)00594-0 |
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Preparation and characterisation of gold nanoparticle assemblies
on silanised glass plates
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Oliver
Seitz, Mohamed M. Chehimi, Eva Cabet-Deliry, Stéphanie
Truong, Nordin Felidj, Christian Perruchot, Steve J. Greaves
and John F. Watts
Interfaces, Traitements, Organisation
et Dynamique des Systèmes (ITODYS), Université Paris
7, Denis Diderot, associé au CNRS (UMR 7086),
1 rue Guy de la Brosse, Paris 75005, France
Laboratoire d'Electrochimie Moléculaire, Université Paris
7, Denis Diderot, associé au CNRS (UMR 7591), 2 place Jussieu,
case 7107, 75251, Paris Cedex 05, France
School of Mechanical and Materials Engineering, University of Surrey,
Guildford GU2 7XH, UK
Gold nanoparticles were prepared by the chemical reduction of AuCl4− and
attached to aminopropyltrimethoxysilane-treated glass plates. The assemblies
of gold nanoparticles on silanised glass were characterised by UV spectroscopy,
X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM)
and surface-enhanced Raman scattering (SERS). The gold nanoparticles
had a diameter in the range 40±10 nm as estimated by AFM. Gold
was found to be in the metallic state as judged from XPS measurements
of the Au 4f7/2 core electron binding energy. AFM showed that
the gold nanoparticles experience a self-organisation on the silanised
surface in such a way that the final assemblies have a certain degree
of roughness and compactness. These characteristics are intimately related
to the SERS effect as determined using the molecular probe bi-ethylene-pyridine
at very low concentration. A huge enhancement of the Raman signals was
observed and assigned to a coupling between gold particles. However,
this SERS effect critically depends on the surface treatment of the substrate
by the silane coupling agent, a procedure that is necessary for the attachment
of the gold nanoparticles |
