Tuning mechanical properties of electrospun piezoelectric nanofibers by heat treatment

Tu Ngoc Lam, Chun Chieh Wang*, Wen Ching Ko, Jyh Ming Wu, Sz Nian Lai, Wei Tsung Chuang, Chun Jen Su, Chia Yin Ma, Mao Yuan Luo, Ying Jhih Wang, E-Wen Huang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


We report an annealing method which significantly enhances the piezoelectric performance by simultaneously tuning morphology and crystalline phase of electrospun P(VDF-TrFE) nanofibers. Annealing process-induced transformation, from α to β crystalline phase at lattice scale, also changes fiber morphology at micrometer scale. The underlying differences between as-spun and annealed P(VDF-TrFE) nanofibers for their stretch-hold deformation were examined via in-situ synchrotron for both small and wide angle X-ray scattering (SAXS and WAXS). Transmission X-ray microscopy (TXM) characterization reveals the underneath fiber orientation subjected to different levels of deformation. Multi-length scale microstructural evolution demonstrates distinct deformation behaviors of the as-spun and annealed nanofibers during uniaxial tensile loading. The findings can be applied for multi-scale structure modulation for the design of future piezoelectric devices.

Original languageEnglish
Article number100461
StatePublished - 1 Dec 2019


  • Deformation
  • Electrospun nanofibers
  • Piezoelectricity
  • Small and wide angle X-ray scattering
  • Transmission X-ray microscopy

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