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Lecture M. Goldmann

Rooster

WanneerWaar
07 maart 2005 FWN-Building 5113.0201, Nijenborgh 4, 9747 AG, Groningen
Speaker: Dr. M. Goldmann
Affiliation: Institut des Nanosciences de Paris, Laboratoire pour l'Utilisation du Rayonnement Electromagnétique
Title: X-ray surface radiolysis: formation of metal-organic interface
Date: Mon Mar 7, 2005
Start: 13.00
Location: FWN-Building 5113.0201
Host: M. Lubomska
Telephone: +31 50 363 4814 / 4974 (secr.)

Abstract

The formation of metal-organic interface is an open question in material science. Its applications are numerous, from colloids (microcatalysis) to thin layers (microelectronics). We apply the radiolysis method to self-assembled surfactants coexisting with metal ions in solutions. We expect that aggregation of metal atoms will takes place around the surfactants polar head and then create a metallic thin layer around the supramolecular assembly used as template.

We present results obtained in a 2D geometry. Indeed, irradiating with an x-ray beam at grazing incidence a Langmuir monolayer of behenic acid deposited onto a silver solution, we obtain a thin silver layer anchored below the organic film. This silver layer is crystallised and oriented by the interface. Its thickness, about 4.5 nm, is in very good agreement with the penetration of the x-ray evanescent wave. Results in a 3D geometry, silver nanoshells formed onto micelles, will be also presented.

Laatst gewijzigd:22 oktober 2012 14:30