Flexible Piezoelectric Chitosan and Barium Titanate Biocomposite Films for Sensor Applications
authors Guzmán Sierra, Dayana L Bdikin, Igor Tkach, Alexander Vilarinho, Paula M Nunes, Claudia Ferreira, Paula
nationality International
abstract There is currently a demand for flexible biomedical sensors. Characteristics as soft, thin, elastic, flexible and comfortable to the contact with skin should be matched with performance and ultimately made of sustainable, and biocompatible materials. In this work, chitosan as a flexible biodegradable polymeric matrix was combined with ferroelectric BaTiO3 particles obtained by hydrothermal synthesis to prepare flexible films. The biocompo- sites have high flexibility and the addition of particles improves the elasticity of pristine chitosan films. Of relevance towards the targeted application, the biocomposites exhibit a better resist- ance to water than chitosan. The dielectric permittivity increases with the addition of BaTiO3 particles. The observation of d33 and d15 by PFM, confirms the presence of piezoelectric domains corresponding to the location of BaTiO3 particles. These results contribute to the understanding of the role of functional oxides on the chemical and physical behavior of biobased polymers, creating opportunities to design optimized and more sustainable flexible piezoelectric sensor films. Introduction
year published 2021
volume 2021
issue 9
beginning page 792
ending page 803
digital object identifier (doi) 10.1002/ejic.202000938
unique article identifier 000615793700001
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