Glycine-chitosan based flexible biodegradable piezoelectric pressure sensor

Seyed Hosseini, E. , Manjakkal, L. , Shakthivel, D. and Dahiya, R. (2020) Glycine-chitosan based flexible biodegradable piezoelectric pressure sensor. ACS Applied Materials and Interfaces, 12(8), pp. 9008-9016. (doi: 10.1021/acsami.9b21052)

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Abstract

This paper presents flexible pressure sensors based on free-standing and biodegradable glycine-chitosan piezoelectric films. Fabricated by self-assembly of biological molecules of glycine within a water-based chitosan solution, the piezoelectric films consist of stable spherulite structure of β-glycine (size varying from few millimetres to centimetre) embedded in amorphous chitosan polymer. The polymorphic phase of glycine crystals in chitosan, evaluated by X-ray diffraction, confirms the formation of pure ferroelectric phase of glycine (β-phase). Our results show that a simple solvent casting method can be used to prepare a biodegradable β-glycine/chitosan based piezoelectric film with sensitivity (~ 2.82 ± 0.2 mV kPa−1) comparable to those of non-degradable commercial piezoelectric materials. The measured capacitance of the β-glycine/chitosan film is in the range of 0.26 nF to 0.12 nF at a frequency range of 100 Hz and 1 MHz and its dielectric constant and the loss factor are 7.7 and 0.18 respectively in high impedance range under ambient conditions. The results suggest that glycine-chitosan composite is a promising new bio-based piezoelectric material for biodegradable sensors for applications in wearable biomedical diagnostics.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Dahiya, Professor Ravinder and Shakthivel, Dr Dhayalan and Manjakkal, Dr Libu and Seyed Hosseini, Dr Ensieh
Authors: Seyed Hosseini, E., Manjakkal, L., Shakthivel, D., and Dahiya, R.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:ACS Applied Materials and Interfaces
Publisher:American Chemical Society
ISSN:1944-8244
ISSN (Online):1944-8252
Copyright Holders:Copyright © 2020 American Chemical Society
First Published:First published in ACS Applied Materials and Interfaces 12(8):9008-9016
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
301728Engineering Fellowships for Growth: Printed Tactile SKINRavinder DahiyaEngineering and Physical Sciences Research Council (EPSRC)EP/R029644/1ENG - Electronics & Nanoscale Engineering
170185Engineering Fellowships for Growth: Printed Tactile SKINRavinder DahiyaEngineering and Physical Sciences Research Council (EPSRC)EP/M002527/1ENG - Electronics & Nanoscale Engineering