Clamping effect on the piezoelectric responses of screen printed low temperature PZT/Polymer films on flexible substrates


Almusallam, Ahmed, Yang, Kai, Zhu, Dibin, Torah, Russel, Komolafe, A, Tudor, J and Beeby, S P (2015) Clamping effect on the piezoelectric responses of screen printed low temperature PZT/Polymer films on flexible substrates Smart Materials and Structures, 24, 115030-[8pp]. (doi:10.1088/0964-1726/24/11/115030).

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Description/Abstract

This paper introduces a new flexible lead zirconate titanate (PZT)/polymer composite material that can be screen-printed onto fabrics and flexible substrates, and investigates the clamping effect of these substrates on the characterization of the piezoelectric material. Experimental results showed that the optimum blend of PZT/polymer binder with a weight ratio of 12:1 provides a dielectric constant of 146. The measured value of the piezoelectric coefficient d33 was found to depend on the substrate used. Measured d33clp values of 70, 40, 36 pC N?1 were obtained from the optimum formulation printed on Polyester–cotton with an interface layer, Kapton and alumina substrates, respectively. The variation in the measured d33clp values occurs because of the effect of the mechanical boundary conditions of the substrate. The piezoelectric film is mechanically bonded to the surface of the substrate and this constrains the film in the plane of the substrate (the 1-direction). This constraint means that the perpendicular forces (applied in the 3 direction) used to measure d33 introduce a strain in the 1-direction that produces a charge of the opposite polarity to that induced by the d33 effect. This is due to the negative sign of the d31 coefficient and has the effect of reducing the measured d33 value. Theoretical and experimental investigations confirm a reduction of 13%, 50% and 55% in the estimated freestanding d33fs values (80 pC N?1) on Polyester–cotton, Kapton and alumina substrates, respectively. These results demonstrate the effect of the boundary conditions of the substrate/PZT interface on the piezoelectric response of the PZT/polymer film and in particular the reduced effect of fabric substrates due to their lowered stiffness.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1088/0964-1726/24/11/115030
Related URLs:
Keywords: flexible substrates, fabrics, e-textiles, piezoelectric composites, polymers, energy harvesting, clamping
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Organisations: EEE
ePrint ID: 384255
Date :
Date Event
24 August 2015Accepted/In Press
22 October 2015Published
Date Deposited: 21 Dec 2015 10:45
Last Modified: 22 Feb 2017 07:26
Projects:
Energy Harvesting Materials for Smart Fabrics and Interactive Textiles
Funded by: EPSRC (EP/I005323/1)
Led by: Stephen Paul Beeby
1 October 2010 to 30 September 2015
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/384255

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