Dissymmetrical gold tagging on spherical silica nanoparticles
Résumé
To tag silica beads-with gold nanoclusters in a dissymmetrical way, a dense layer of silica particles functionalised with amino groups was spread along an interface between two media. Gold was introduced through one of these media and then was adsorbed onto the corresponding silica hemisphere. Three interfaces were used: (i) the gas-liquid interface, thanks to the Langmuir technique, (ii) the liquid-solid interface after self-deposition onto large acrylic beads or commercial resins used for solid phase synthesis, or after deposition onto a solid substrate using the Langmuir-Blodgett technique, (iii) gas-solid interface with physical vapour deposition of Au. This communication presents the various synthesis routes, comparing their efficiency based on transmission electron microscopy observations.