Fabrication of an ESA multilayer film from a diazo resin by direct surfacecharge reversal

An electrostatic self-assemby (ESA) multilayer film of a diazo resin (DR) w as fabricated by direct surface charge reversal. DR is first adsorbed onto the substrate via electrostatic interaction, and in the chemical activation step, the sign of the surface charge is directly reversed by converting th e positively charged diazonium ion to the negatively charged diazo sulfonat e ion under mild conditions. By repeating adsorption and chemical activatio n step, the film grows regularly layer by layer.