Method of forming an electronic device on a flexible substrate

A method of forming an electronic device on a flexible substrate, wherein the flexible substrate is a sheet, the method comprising the steps of:

• wax printing a hydrophobic mask on a porous membrane to form a pattern thereon which is complementary to a desired pattern;
• filtering an aqueous suspension consisting of water and an electronic material, wherein the electronic material is graphene oxide, through a non-printed region of the porous membrane, wherein some electronic material is deposited on the non-printed region following the desired pattern;
• and
• transferring the patterned electronic material to the sheet by a transfer step consisting of pressing the sheet against the printed face of the porous membrane with a press, enabling the transfer of the patterned electronic material deposited on the porous membrane to the sheet to form the electronic device thereon;
• wherein the transfer step of the method is carried out without using acetone dissolvent.