Fabrication methods for selective membranes that include aligned nanotubes can advantageously include a mechanical polishing step. The nanotubes have their ends closed off during the step of infiltrating a polymer precursor around the nanotubes. This prevents polymer precursor from flowing into the nanotubes. The polishing step is performed after the polymer matrix is formed, and can open up the ends of the nanotubes.
This invention was made with Government support under contract number DE-AR0000025 awarded by the Department of Energy and under contract number W911NF-09-C-0079 awarded by the Department of Defense. The Government has certain rights in this invention.