Figure 1: Scheme of the Au NT fabrication in ion-track-etched polymer templates. ( 1 ) Sensitization by anchoring Sn(II) ions on the template. ( 2 ) Activation by immersion in a Ag(I) solution, leading to the formation of Ag NPs on the inner and outer template surface. ( 3 ) Electroless Au plating using a Au(I) complex (L = ligand) as the oxidizing and formaldehyde as the reducing agent. The deposition reaction is altered by specifically adsorbing additives.