Crown ether ligands attached to monolayer-protected clusters (MPCs) were assembled as films and the linking mechanism between the crown ether–metal ion–crown ether bridges between nanoparticles was examined. Thicker films exhibited a red shift in the absorbance maximum for the surface plasmon band which was attributed to the increasing aggregation and cross linking within the film. Quantized double layer charging peaks suggest that film growth is selective toward a specific core size or exchange rate, either of which affect the number of potential linking ligands in the periphery of the MPCs. Multi-layer growth of films was only achieved with metal ions capable of coordinating within the cavity of the 15-crown-5 ether. Our exchange reaction parameters are in stark contrast to other types of MPC film assemblies.
Copyright © 2006 Elsevier. Article first published online: 3 JUL 2006.
The definitive version is available at: https://www.sciencedirect.com/science/article/pii/S0040609005026672.
R.R. Pompano,* P.G. Wortley,* L.M. Moatz,* DJ Tognarelli,* K.W. Kittredge, M.C. Leopold, “Crown Ether-Metal ‘Sandwiches’ As Linking Mechanisms in Assembled Nanoparticle Films” Thin Solid Films 2006, 510, 311-319.