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Ultra-Thin Films of Alternating Semi-Interpenetrating Layers of a Conducting Polymer with Thermosetting Phenolic Resins for Sensor Application

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Abstract:

In this work a new method for crosslinking ultra-thin films with potential applications in sensor systems is proposed. The films were produced by layer-by-layer (LbL) assembly using a conducting polymer, poly(o-ethoxyaniline) (POEA), alternated with a thermosetting resin, novolac-type phenol-formaldehyde (PF), crosslinked by a simple thermal treatment. The PF resin served as both alternating and crosslinking agents. The films were characterized by Fourier transform infrared (FTIR) and ultraviolet-visible (UV-Vis) spectroscopy, thermogravimetry (TG), desorption, doping/dedoping cycling and electrical measurements. The results showed that film architecture and crosslinking degree can be controlled by the conditions used for film deposition (number of bilayers, polymer concentration, pH, and deposition time), and crosslinking time. Moreover, this approach offers several advantages such as fast curing time and low cost, indicating that these films can be used to produce sensors with improved stability.

Keywords: CONDUCTING POLYMERS; CROSSLINKING; LAYER-BY-LAYER; PHENOLIC RESINS; POLY(O-ETHOXYANILINE); SENSOR STABILITY

Document Type: Research Article

DOI: https://doi.org/10.1166/sl.2008.037

Publication date: 2008-04-01

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