Micro/nano-structured surfaces prepared by photolithography, soft-lithography and the template of colloidal silica spheres

The preparation of the micro/nano-stuctured surfaces is important for wetting study of material surfaces and application of biomaterials, in order to obtain super-hydrophobility or meet well the requirement of the biological environments. In the present work, preparation of micron and sub-micron/nano-scale structured surfaces was studied. Micro-scale square or round structures on the surfaces were prepared by photo-lithography; the distorted square or round structures such as tower-shape and disc-shape structures were imprinted by soft-lithography; the sub-micron/nano-scale net structured surfaces were prepared by using self-assembled silica colloidal crystals as the template and infiltration of polystyrene-toluene solution in the crystals. The surface features of the samples were investigated by optical and scanning electron microscopy (SEM).