Abstract: A method for fabricating nanostructured polymeric materials based on a combination of inkjet printing and template synthesis. Layer-by-layer assembled nanotubes can be synthesized in a polycarbonate track-etched (PCTE) membrane by printing poly(allylamine hydrochloride) (PAH) and poly(styrenesulfonate) (PSS) sequentially. By changing the printing conditions, polymeric nanotubes or nanowires can be prepared by printing poly(vinyl alcohol) (PVA) in a PCTE template. Inkjet printing paired with template synthesis can be used to generate patterns comprised of chemically distinct nanomaterials. Thin polymeric films of layer-by-layer assembled PAH and PSS can be printed on a PCTE membrane. Inkjet printing paired with template synthesis can also be used to prepare functional mosaic membranes, such as charge mosaic membranes comprising polyelectrolytes of different charges to pattern positively charged or negatively-charged domains, respectively, on the surface of the template.