Figure 2From: Nanostructures formed by displacement of porous silicon with copper: from nanoparticles to porous membranesSEM top views of Cu NPs. Cu NPs were grown on PS with a thickness of 1 μm and porosity of 50% to 55% (a, b) and 80% to 85% (c, d) by displacement deposition for 4 s (a, c) and 180 s (b, d).Back to article page