par Bruylants, Gilles ;Bartik, Kristin ;Delplancke, Marie-Paule
Référence ENCF 2010 : European Conference on Nano Films (2010-03-22 au 2010-03-25: Liège, Belgique)
Publication Non publié, 2010-03-24
Communication à un colloque
Résumé : Nanoparticles superlattices can be prepared by self assembly, under strict synthetic control, of hybrid nanoparticles composed of a metallic bulk (from a few to hundreds of namometers in diameter) surrounded by an organic passivating layer. The nanoparticles are arranged with long-range crystalline order. These superlattices are promising materials for applications in various fields such as recording media, light–emitting devices, biological tags, catalysts, solar cells, and sensors. The characterization and elucidation of the size–evolutionary patterns of the properties of these finite size assemblies are among the major challenges in modern materials science. The auto-assembly is only possible when the nanoparticles display a narrow size distribution. The citrate reduction of gold(III) in water is one of the most commonly used synthesis pathway for the preparation of gold colloids (Turkevich method [1]) and the pH, temperature and relative concentrations of gold and citrate are key parameters determining the final size and size distribution of the nanoparticles [2,3]. The nucleation and growth mechanisms remain unclear and are the subject of intense research. We have investigated the nucleation and growth kinetics of gold nanoparticles under different experimental conditions in order to avoid temperature and concentration gradients. The auto-assembly of these particles into superlattices has been envisaged with the aim of investigating the influence of non-covalent interactions between ligands on the formation of the lattices and their properties.