ON THE CHARACTERIZATION AND GAS-SENSING PROPERTIES OF CU(II) TETRA(ALKYLAMINO CARBONYL) PHTHALOCYANINE LB FILMS

Langmuir-Blodgett (LB) films of a substituted phthalocyanine containin g the amidic group (CONH) instead of the ester group (COO) have been s tudied. Floating films were spread onto the water surface from chlorof orm solutions and were transferred onto hydrophilic quartz substrates using the vertical lifting method. Linearly polarised light absorbance measurements were performed at room temperature in the 400-800 nm spe ctral range. The average orientation of the phthalocyanine molecular r ings in the LB film, with respect to the normal to the substrate and d ipping direction, has been evaluated. Dynamic response characteristics of the electrical conductance of the LB films to different NO2 concen trations, carried out in dry air and at room temperature, have shown a high sensitivity to concentrations of nitrogen dioxide smaller than 5 0 ppm. (C) 1998 Elsevier Science S.A. All rights reserved.