Synthesis of carbon nanowalls on the surface of nanoporous alumina membranes by RI-PECVD method

•The synthesis of carbon nanowalls on the surface of a nanoporous membrane of aluminum oxide.•The shape and height of synthesized carbon nanowalls depend on the pore size and thickness of the nanoporous substrate.•It was determined that the walls of the CNWs formed on highly porous alumina substrates are thinner, that is, have fewer graphene layers due to the higher vertical growth rate.