Energy harvesting with piezoelectric nanomaterials spurred the development of self-powered nanosystems, and piezoelectric biomaterials are expected to play an important role in the biomedical field. Bio-inspired piezoelectric diphenylalanine (FF) peptide microstructures were fabricated on various substrates through a novel epitaxial growth approach. The low-temperature process produced vertically aligned FF peptide microrods with hexagonally arranged nanochannels and uniform polarization. Direct measurement of the piezoelectricity was achieved for the first time from a solid FF peptide single crystal and yielded an effective piezoelectric coefficient d33 at 9.9pm/V. The dense and aligned FF peptide microrods are advantageous for energy and sensing applications.
Bibliographical noteFunding Information:
The authors are truly grateful for the financial support from the Department of Mechanical Engineering and the College of Science and Engineering of the University of Minnesota . Research is also supported by in part by NSF ( ECCS-1150147 ) and by NSF IGERT Grant DGE-1069104 . The electron microscopy image was obtained in the Characterization Facility, University of Minnesota, which receives partial support from NSF through the MRSEC program. The device fabrication was performed in the Minnesota Nano Center, a part of the NSF-funded National Nanotechnology Infrastructure Network.
© 2015 Elsevier Ltd.