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A Thick-film Piezoelectric Multimorph Cantilever

A Thick-film Piezoelectric Multimorph Cantilever
A Thick-film Piezoelectric Multimorph Cantilever
Free-standing thick-film cantilevers have the potential to be used as micro-generators as well as self-generating resonant sensors. Earlier versions of free-standing devices were implemented by fabricating in the form of multilayer structures. Instead of structures with a plate of PZT sandwiched between upper and lower electrodes, multimorph structures consist of three individual PZT plates having equal thicknesses (of about 40 ?m each). Ag/Pd conductors form the separators between the layers, also acting as electrodes on the upper and lower layers of the structure. Each piezoelectric plate was polarised in its thickness direction with two different modes: parallel and series. In the parallel mode, both the upper and lower PZT plates were polarised in the opposite direction, while in the series mode the upper plates and the lower plates were polarised in the same direction. The centre plate of PZT acts as the neutral axis of the structure. Using the direct piezoelectric effect, a voltage was generated when the multimorph structures were bent by the application of a harmonic excitation. An output power of 10 ?W was measured for the parallel polarised sample. Series multimorphs, however, exhibited a non-linear effect, where the output power was 21 ?W for an up-sweeping frequency, but was reduced by a factor of 50 for a down-sweeping frequency.
Thick-film, multimorph, free-standing structure
Kok, Swee Leong
cd2530f7-f6db-4f6b-956e-906c5d559216
White, Neil
c7be4c26-e419-4e5c-9420-09fc02e2ac9c
Harris, Nick
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Kok, Swee Leong
cd2530f7-f6db-4f6b-956e-906c5d559216
White, Neil
c7be4c26-e419-4e5c-9420-09fc02e2ac9c
Harris, Nick
237cfdbd-86e4-4025-869c-c85136f14dfd

Kok, Swee Leong, White, Neil and Harris, Nick (2009) A Thick-film Piezoelectric Multimorph Cantilever. Dielectrics 2009, United Kingdom. 15 - 17 Apr 2009.

Record type: Conference or Workshop Item (Other)

Abstract

Free-standing thick-film cantilevers have the potential to be used as micro-generators as well as self-generating resonant sensors. Earlier versions of free-standing devices were implemented by fabricating in the form of multilayer structures. Instead of structures with a plate of PZT sandwiched between upper and lower electrodes, multimorph structures consist of three individual PZT plates having equal thicknesses (of about 40 ?m each). Ag/Pd conductors form the separators between the layers, also acting as electrodes on the upper and lower layers of the structure. Each piezoelectric plate was polarised in its thickness direction with two different modes: parallel and series. In the parallel mode, both the upper and lower PZT plates were polarised in the opposite direction, while in the series mode the upper plates and the lower plates were polarised in the same direction. The centre plate of PZT acts as the neutral axis of the structure. Using the direct piezoelectric effect, a voltage was generated when the multimorph structures were bent by the application of a harmonic excitation. An output power of 10 ?W was measured for the parallel polarised sample. Series multimorphs, however, exhibited a non-linear effect, where the output power was 21 ?W for an up-sweeping frequency, but was reduced by a factor of 50 for a down-sweeping frequency.

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More information

Published date: 15 April 2009
Additional Information: Event Dates: 15 - 17 April 2009
Venue - Dates: Dielectrics 2009, United Kingdom, 2009-04-15 - 2009-04-17
Keywords: Thick-film, multimorph, free-standing structure
Organisations: EEE

Identifiers

Local EPrints ID: 267294
URI: http://eprints.soton.ac.uk/id/eprint/267294
PURE UUID: 8faa3f00-eb74-4b40-9fd2-5d14be7af7b1
ORCID for Neil White: ORCID iD orcid.org/0000-0003-1532-6452
ORCID for Nick Harris: ORCID iD orcid.org/0000-0003-4122-2219

Catalogue record

Date deposited: 25 Apr 2009 13:54
Last modified: 20 Jul 2019 01:24

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