Patent ID: 11968904
Assignee: CITY UNIVERSITY OF HONG KONG
Field: nan (nan)
Classification: CPC H | IPC H

Claim 0:
1. A flexible piezoelectric composite comprising:
a polymer matrix including at least two polymers and having a low Young's modulus of less than 10 MPa and a permittivity of less than 10;
a porous organic template selected from paper, textile, wood, bamboo, or any organic template having a relatively permittivity of 500 to 7,000 and average pore size of about 10 to 300 μm filled with at least one surface-modified piezoelectric element to form a three-dimensional interconnected ceramic framework such that said polymer matrix after being subject to sintering followed by curing forms a ceramic-polymer composite with equal to or less than 50% volume shrinkage with respect to initial volume of the three-dimensional interconnected ceramic framework and the polymer matrix before said sintering and curing;
at least a pair of electrodes sandwiching the ceramic-polymer framework and subsequently stacking a protective layer on each of the pair of electrodes,
wherein one of the at least two polymers in the polymer matrix is relatively less stiff than the other such that the relatively less stiff polymer serves as an elastic filler whereas the relatively stiffer polymer serves as a mechanical support of the ceramic-polymer framework, and
wherein the flexible, piezoelectric composite is configured to receive an electric field greater than coercive field of the three-dimensional interconnected ceramic framework so as to remain the composite piezoelectrically active.