Arrayed hybrid nanoporous Pt pillars

2D arrayed Pt columns with 3D-nanoporous structure were fabricated by electroplating Pt in reverse micelle (L2) solution of a nonionic surfactant filled in 1D microchannels of alumina porous membrane. This thin film features a unique hybrid system consisting of nanoporous structure embedded in the secondary microstructure, which is increasingly of great importance in terms of maximal efficacy of the interfacial properties of nanoporous surface. The diameter of the 3D-nanoporous pillars was ∼300 nm and the length was precisely controlled by the electroplating condition. This is the first report of the hybrid 3D-nanoporous micro-columnar metal film by one-step electrochemical deposition in a reverse micelle solution.