Gas sensitivity of composite Langmuir-Blodgett films of Fe2O3 nanoparticle-copper phthalocyanine

The Langmuir-Blodgett (LB) composite films, ferric oxide nanoparticle compo site with tris-(2,3-di-t-amylphenoxy)-(8-quinolinolinolyl) copper phthalocy anine (CuPcA(2)), were obtained by capped type and alternated type and char acterized by X-ray photoelectron spectroscopy (XPS) and visible spectra. Th e gas sensitivity of the composite films and the pure ferric oxide and pure CuPcA(2) LB films to ammonia and ethanol were measured at room temperature . The composite films could be used as the C2H5OH sensors in the range of 2 -8 or 100-200 ppm. The XPS data suggested that the adduct complex NH3-CuPcA (2) was formed after the capped film was exposed to the detected gas of amm onia. (C) 2000 Elsevier Science B.V. All rights reserved.