PANI/PPY blend thin films electrodeposited for use in EGFET sensors

ABSTRACT Galvanostatic electrodeposited thin films of polyaniline (PANI)/polypyrrole (PPY) blend were tested as chemical sensors and evaluated according to the relative monomer concentration in polymerization solution aiming to obtain a reliable reference field‐effect transistor able to be used as c...

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Bibliographic Details
Published in:Journal of applied polymer science 2018-09, Vol.135 (33), p.n/a
Main Authors: Mello, Hugo José Nogueira Pedroza Dias, Mulato, Marcelo
Format: Article
Language:English
Subjects:
Aniline
blends
Chemical sensors
conducting polymers
Correlation analysis
Materials science
Monomers
Optical properties
Polyanilines
Polymerization
Polymers
Polypyrroles
Reflectance
Sensitivity
sensors and actuators
Stability
structure–property relationships
synthesis and processing techniques
Thin films
Transistors
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Summary:ABSTRACT Galvanostatic electrodeposited thin films of polyaniline (PANI)/polypyrrole (PPY) blend were tested as chemical sensors and evaluated according to the relative monomer concentration in polymerization solution aiming to obtain a reliable reference field‐effect transistor able to be used as contrast sensing film. The blend material presented properties that can be controlled by the polymerization process. The films were produced using aniline (0.25 M) and pyrrole (0.25 M) mixed in five different proportions (90/10, 70/30, 50/50, 30/70, 10/90) with HCl (1.0 M) in an aqueous solution. The current density was 1 mA/cm2 for 300 s. The films were analyzed by their chronopotentiometric curves, thickness, reflectance spectroscopy, optical color parameters, and surface morphology. The characteristics and properties analyzed were correlated to the relative monomer concentration in the polymerization solution. The polymerization of PANI is favorable in aqueous acid solution compared to PPY, which resulted in thin films with properties varying from PANI down to PPY. The blend films presented controllable sensitivity when applied as sensing stage in field‐effect transistor devices as function of the relative monomer concentration. The sensitivity varied from 57 ± 1 mV/pH for the PANI sample, down to 25 ± 1 mV/pH for the PPY sample, presenting an exponential behavior. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46625.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.46625