Shear Piezoelectricity in Poly(vinylidenefluoride-co-trifluoroethylene): Full Piezotensor Coefficients by Molecular Modeling, Biaxial Transverse Response, and Use in Suspended Energy-Harvesting Nanostructures

Luana Persano*, Alessandra Catellani, Canan Dagdeviren, Yinji Ma, Xiaogang Guo, Yonggang Huang, Arrigo Calzolari, Dario Pisignano

*Corresponding author for this work

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

An experiment has demonstrated that by analyzing the shear behavior, the response in suspended geometries can be fully rationalized upon taking into account transverse contributions. P(VDF-TrFE) solutions were prepared, and placed into a 1.0 mL syringe tipped with a 27 gauge stainless steel needle. A bias of 25 kV was applied to the needle by a high voltage supply. A grounded cylindrical collector (diameter 8 cm), was placed at a distance of 6 cm from the needle. Properly designed shadow masks were positioned on the surface of the disk to deposit single nanowires. Nanowires with a measured VDF:TrFE ratio of about 70:30] were inspected by SEM with a Nova NanoSEM 450 system (FEI), using an acceleration voltage around 5 kV and an aperture size of 30 μm. Fourier transform infrared spectroscopy was performed with a spectrophotometer using a 4 mm wide beam incident orthogonally to the plane of the samples. The resulting architectures are extremely versatile, and they can find application in devices for nanoscale localization nearby large-scale surfaces and in systems for harvesting vibrational noise, which might activate the piezo-electric response of nanobeams without involving large-scale deformation of the underlying supporting substrates. Coupling flexural deformation and transverse piezoelectric response under compression forces establishes new rules for designing next devices based on polymer piezoelectric nanomaterials.

Original languageEnglish (US)
Pages (from-to)7633-7639
Number of pages7
JournalAdvanced Materials
Volume28
Issue number35
DOIs
StatePublished - Jan 1 2016

Keywords

  • electromechanical coupling
  • electrospinning
  • piezoelectric properties
  • polymer nanofibers

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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