We report in this paper on the electrochemical formation of nickel tetrasulfonated phthalocyanine (NiTSPc) based films on bulk Pt disk microelectrodes (diameter d = 50 μm) and thin-film Pt microdisk (diameter d = 10 μm) arrays for the realisation of Pt based nitric oxide sensors. Our results show that, despite the simultaneous formation of platinum oxides, NiTSPc deposited film offers an interesting alternative to elaborate new electrode configuration. © 2002 Elsevier Science B.V. All rights reserved.