4.6 Article

Testing the Performance of the Azo-Polyimide Supramolecular Systems as Substrate for Sensors Based on Platinum Electrodes

Journal

MATERIALS
Volume 16, Issue 14, Pages -

Publisher

MDPI
DOI: 10.3390/ma16144980

Keywords

supramolecular structure; polyimide film; azo monomer; mechanical behavior; AFM; dielectric properties

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Azo-polyimide films with supramolecular structure were synthesized by casting a mixture of polyamidic acid and azochromophore onto glass plates, followed by thermal treatment. The dielectric characteristics of the films were investigated using broad-band dielectric spectroscopy at different temperatures and frequencies. The films exhibited flexibility, toughness, and maintained integrity after repeated bending.
Azo-polyimide films with supramolecular structure were obtained by casting onto glass plates a mixture based on polyamidic acid and different quantities of azochromophore, followed by thermal treatment to realize the final azo-polyimide structure. The dielectric characteristics of the supramolecular structure of polymer films were investigated by broad-band dielectric spectroscopy measurements at different temperatures and frequencies. The free-standing films proved to be flexible and tough and maintained their integrity after repeated bending. The work of adhesion at the polymer/platinum interface was calculated after the evaluation of the surface energy parameters before and after plasma treatment. Atomic force microscopy was used to image the surface morphology, the evolution of the roughness parameters, and the adhesion force between the platinum-covered tip and the polymer surface, registered at the nanoscale with the quantity of the azo dye introduced in the system. The simulation of the columnar growth of a platinum layer was made to provide information about the deposition parameters that should be used for optimal results in the deposition of platinum electrodes for sensors.

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