Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 137, Issue 1, Pages 281-290Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2008.10.053
Keywords
Fluorinated polyimide; Meso-tetraphenylporphyrin; Thin films; Optical properties; Optical vapour sensor
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Thin films of different fluorinated polyimides derived from 4,4'-hexafluoroisopropylidene diphthalic anhydride (6FDA), 2,3,5.6-tetramethyl paraphenylene diamine (DAD) and 3,3'-diaminodiphenylsulfone (DDS) with dispersed 5,10,15,20-tetraphenylporphyrin (H(2)TPP) were produced. The chemical Structure and the surface morphology and topography of the final films were studied by Fourier transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM). The photophysical properties of the films as derived from absorption, excitation and emission spectra were thoroughly investigated and correlated to the distribution and possible aggregation of H(2)TPP moieties in the polyimide matrix. Optical sensing capabilities of these composite films were tested by exposing them to ethanol and water vapour atmospheres. Unusual emission spectral changes of these materials upon exposure to ethanol and water vapours have been interpreted in terms of porphyrin macrocycle distortions induced by the presence of ethanol molecules which ultimately affects the position and shape of the potential curves representing the So and S, electronic states. The fluorescence signal drop detected on incoming analyte is fully and swiftly recovered upon re-exposure of the sensing material to pure nitrogen. The optical response is steady, reproducible and very fast (tens of seconds). (C) 2008 Elsevier B.V. All rights reserved.
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