Poling piezoelectric (K,Na,Li)NbO3-polydimethylsiloxane composites
D. B. Deutz (TU Delft - Aerospace Engineering)
N. T. Mascarenhas (TU Delft - Aerospace Engineering)
S. van der Zwaag (TU Delft - Aerospace Engineering)
W. A. Groen (TU Delft - Aerospace Engineering, TNO)
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Abstract
Composites of aligned (K,Na,Li)NbO3 (KNLN) piezoceramic particles in a PDMS polymer matrix are presented as promising materials for flexible sensors and energy harvesters. Their ease of processing is matched with a relatively high damage tolerance and piezoelectric performance at low dielectric loss. To maximize piezoelectric performance, the effective poling conditions for dielectrophoretically structured KNLN-PDMS composites are studied, and compared with random composites. Effective poling is identified at 7.5 kV/mm, for 6 min at 150°C in structured composites. The structured composites demonstrate improved piezoelectric performance, with respect to random composites, while retaining the low stiffness of the PDMS polymer matrix.
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