the films were found to be stable under ambient conditions up to 18 months.10 In another study, Hiller et al. used a similar approach to introduce nanoscale pores in PAH/PAA films.11 By reducing the pH of the acidic solution to 1.8, pore sizes were reduced to 15???80nm.11 In addition to lowering the pH, salts such as NaCl and MgCl2 were added at low concentrations to promote structural rearrangeme