Detection and titration of ozone using metallophthalocyanine based field effect transistors

A new technology is proposed in which a molecular field effect transistor is used to titrate quantitatively ozone in air in the range 0–300 ppb. Good results have been obtained by employing a procedure of measurement in which the equilibrium state is never reached. Both the stability of the device and the reproducibility have been tested and shown to be satisfactory. X-ray photoelectron spectroscopy (XPS) and UV–VIS absorption measurements have demonstrated that only the superficial layer of the molecular layer (PcNi) is degraded by ozone leading to a long sensor lifetime.