Detection and titration of ozone using metallophthalocyanine based field effect transistors

A new technology is proposed in which a molecular field effect transistor i s 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 a nd the reproducibility have been tested and shown to be satisfactory. X-ray photoelectron spectroscopy (XPS) and W-VIS absorption measurements have de monstrated that only the superficial layer of the molecular layer (PcNi) is degraded by ozone leading to a long sensor lifetime. (C) 2001 Elsevier Sci ence B.V. All rights reserved.