4.6 Article

Enhanced piezoelectric performance of ceramic-polymer composite cantilevers with thin metal substrates

Journal

APPLIED PHYSICS LETTERS
Volume 120, Issue 5, Pages -

Publisher

AIP Publishing
DOI: 10.1063/5.0075853

Keywords

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Funding

  1. Academy of Finland [285219, 318203]
  2. Academy of Finland Printed Intelligence Infrastructure, PII [320020]
  3. Business Finland [7543/31/2018]
  4. Tauno Toenning foundation
  5. Walter Ahlstroem foundation
  6. Emil Aaltonen foundation
  7. KAUTE foundation
  8. Riitta and Jorma J. Takanen foundation
  9. Ulla Tuominen foundation
  10. Infotech Oulu Doctoral Program
  11. Academy of Finland (AKA) [318203, 320020, 285219, 285219, 318203, 320020] Funding Source: Academy of Finland (AKA)

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The electromechanical properties of a lead zirconate titanate-poly(vinylidenefluoride-trifluoroethylene) ceramic-polymer composite on thin brass and steel substrates were investigated. The results showed improved piezoelectric properties with the stiffer steel substrate samples. The developed material and cantilever structures are feasible for both sensor and energy harvesting applications.
In this work, the electromechanical properties of a lead zirconate titanate-poly(vinylidenefluoride-trifluoroethylene) ceramic-polymer composite on thin brass and steel substrates were investigated. Samples were stencil printed on metal foils and cured at 120 & DEG;C. The effective transverse piezoelectric coefficient (d(31eff)) was calculated by utilizing the converse piezoelectric effect and measuring the displacement of a cantilever sample's tip in an electric field. Interestingly, the results showed improved piezoelectric properties with the stiffer steel substrate samples. The highest d(31eff) achieved was about -22 pm/V, which was 29% higher than in samples printed on brass foil (-17 pm/V). Both are substantially higher compared to the coefficients reported with similar ceramic-polymer composites on polymer substrates. The improvement is suggested to originate from the prevention of buckling effects and more effective bending deformation, while the structure remained flexible. Due to the high effective values of d(31) and g(31), the developed material and cantilever structures are feasible for both sensor and energy harvesting applications.

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