Preparation of porous monolayer film by immersing the stearic acid Langmuir-Blodgett monolayer on mica in salt solution

► Porous film has been prepared by immersing the stearic acid Langmuir-Blodgett monolayer on mica in salt solution. ► The mechanism relies on the electrostatic screening effect of the cations in salt solution. ► The factors influencing the size and area of the pores were investigated.