Tuesday, 11 October 2022
Conductive biomimetic composites are a blended technology which exploit the biocompatibility of natural polymers and the electron transfer abilities of conductive materials assembled in a composite matrix. Natural polysaccharides are ideal scaffolds because of their diverse functionality leading to more amenable synthetic modifications. One such modification is the functionalization of the polysaccharide backbone with a conductive polymer to aid in effective electron transfer throughout the matrix. This work employs the photoinitiation of a metal-polysaccharide complex (V5+ or Fe3+- alginate) to directly polymerize polyaniline (PANI) on the polysaccharide backbone. Initial current-voltage (IV) sweeps of the functionalized nanocomposite matrix have shown uniform polymer chain growth as evident by the enhanced charge transfer at an applied voltage. The addition of the conductive polymer to the alginate scaffold unlocks the potential for ion sensing. More specifically, when the undoped composite matrix has an uptake of simulated ionic wound exudate under applied voltage there is a change in the overall conductivity of the network. This work aims to employ a suite of in-situ electrochemical techniques to characterize the real-time adsorption/desorption kinetics of the simulated exudate and quantify the dynamic sensing capacity.