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Cover Picture: Modulation of the Work Function in Layer-by-Layer Assembly of Metal Nanoparticles and Poly-l-lysine on Modified Au Surfaces (ChemPhysChem 4/2004)
The cover picture shows the modulation of the work function in the layer-by-layer growth of assemblies of Au nanoparticles of 19±2 nm diameter and poly-L-lysine on Au surfaces. The decrease in the amplitude of modulation with increasing number of layers is associated with disordering in the 3D assembly. This disordering manifests itself in the increment of the surface roughness as illustrated in the 500×500 nm2 AFM images of the first and fifth layer of particles. On page 571, Carrara et al. demonstrate that the modulation of the work function in multilayered materials is dependent on the size and nature of the metal nanoparticles.