Immobilization of Redox-Active Ligands on an Electrode: The Dendrimer Route We thank the Ministère de l'Enseignement Supérieur et de la Recherche and the CNRS for financial support. MESR and Fundacion Ramon Areces (Spain) are also gratefully acknowledged for funding grants (to G.T. and R.M.S, respectively). We are grateful to Dr. R. Filmon for SEM experiments.