Electro-conductive membranes formed by carbon nanoparticle network array were fabricated via micro-phase separation process in the polymer system of cellulose acetate/acetone/water ternary solution. Micro-phase separation technique is the most common method for preparation and production of polymeric membrane. With the formation of polymer network, added nanoparticles became network by the drive of non-solvent owing to thermodynamic and compatible properties between particles and ternary solution. Meanwhile, the nanoparticle surface properties affected the binding force of neighbor particles for the continuous nanoparticle network structure. Heat treatment on the membrane aims at removing polymer from. Thus, electro-conductive nanoparticle network membrane can be facilely prepared. (C) 2016 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.