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 |
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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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