Strong piezoelectricity in bioinspired peptide nanotubes

Area of Science:

• Materials Science
• Nanotechnology
• Biophysics

Background:

• Piezoelectric materials are crucial for sensors and actuators.
• Developing sustainable and biocompatible piezoelectric alternatives is an ongoing challenge.
• Self-assembled peptide nanostructures offer unique structural and functional properties.

Purpose of the Study:

• To investigate the piezoelectric properties of diphenylalanine peptide nanotubes (PNTs).
• To quantify the shear piezoelectric activity of PNTs.
• To explore the potential of PNTs as a novel class of piezoelectric materials.

Main Methods:

• Fabrication of self-assembled diphenylalanine peptide nanotubes.
• Measurement of shear piezoelectric response using lateral signal calibration.
• Comparison with known piezoelectric materials like LiNbO(3).
• Testing the mechanical stability and voltage response of PNTs.

Main Results:

• Anomalously strong shear piezoelectric activity was observed in PNTs.
• Electric polarization was found to be directed along the tube axis.
• Effective piezoelectric coefficient values of at least 60 pm/V were determined for ~200 nm diameter tubes.
• PNTs showed linear deformation and no degradation over a wide voltage range.

Conclusions:

• Diphenylalanine peptide nanotubes possess significant piezoelectric properties.
• PNTs represent a promising new class of "green" piezoelectric materials.
• Their bioactivity and compatibility suggest potential for piezonanodevices in biomedical applications.