Piezoelectric peptide-based materials and piezoelectric devices containing same

A piezoelectric transducer comprising, as a piezoelectric material, a three-dimensional structure, said three-dimensional structure is made of a plurality of peptides, said peptides being self-assembling and said structure being piezoelectric, wherein:

• said three-dimensional structure is characterized by a non-centrosymmetric unit cell, and
• at least a portion, or each, of said plurality of peptides is a peptide of 2 or 3 amino acid residues in length comprising at least two adjacent amino acid residues comprising an aromatic moiety, provided that said plurality of peptides is not consisted of a plurality of Phe-Phe dipeptides,
• said piezoelectric transducer being configured for transforming a mechanical input to an electronic output and/or for transforming an electronic input to a mechanical output.