Abstract
Thin films of conducting polymer complexes with polysulfonic acids of various structures were electrochemically deposited onto transparent FTO electrodes. The behavior of the polymer-based optical ammonia vapor sensors in response to various concentrations of ammonia vapors, ranging from 5 to 135 ppm, was investigated, including the response time and response amplitude. It was found that the nature of the conducting polymers (poly (3,4-ethylenedioxythiophene), polypyrrole, polyaniline), as well as the structure of the polyacids, affected the sensing performance of the obtained complexes.
Highlights
Conducting polymers (CPs) are actively used as sensitive materials in gas sensors [1,2,3,4].Sensors based on CP thin films have good mechanical properties and environmental stability, as well as high sensitivity to gases at room temperature [1,2,3,4]
It was shown that the response amplitude, response time and ammonia diffusion coefficient were dependent on the dominant mechanism of interaction
It was shown that the response amplitude, response time and ammonia diffusion coefficient were dependent on the dominant mechanism of interaction of the conducting polymers with the ammonia, flexibility and structure of polyacid chains used during their electrosynthesis
Summary
Sensors based on CP thin films have good mechanical properties and environmental stability, as well as high sensitivity to gases at room temperature [1,2,3,4]. They can be synthesized through chemical or electrochemical polymerization of the monomers. A thin film deposited on glass (or ITO glass) is suitable for the manufacture of an optical sensor, since spectral changes can be recorded using commercial spectrometers [1] or detected using single-wavelength optoelectronic pairs Another advantage is the ability to transmit an analytical signal without distortion over long distances [1,12,13]. Despite the advantages described above, only a few studied have focused on the creation of CP-based optical ammonia sensors [8,9,10,11,12,13,14]
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