Shear-induced ordering of ferroelectric crystals in spin-coated thin poly(vinylidene fluoride-co-trifluoroethylene) films

Hee Joon Jung, Jiyoun Chang, Youn Jung Park, Seok Ju Kang, Bernard Lotz, June Huh, Cheolmin Park

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

We present a robust route for fabricating a thin ferroelectric poly(vinylidene fluoride-co trifluoroethylene) (PVDF-TrFE) film with both molecular and micro structural crystal ordering over the area of 1 × 1 cm2. The method is based on the static mechanical shearing of the film under appropriate thermal conditions. The apparatus designed particularly for ultrathin PVDF-TrFE films with thickness of 200 nm or less allowed us to fabricate a thin film with ca. 25 nm thick crystalline lamellae globally ordered perpendicular to the shear direction. Grazing incident X-ray diffraction and polarized near edge X-ray absorption fine structure further revealed the molecular orientation of the crystals with c and a axes of the PVDF-TrFE crystals preferentially oriented parallel to shear direction and film surface normal, respectively. The shearing of a thin film at 135 °C gave rise to the best crystal orientation directly correlated with approximately 50% enhanced ferroelectric polarization observed in a metal/sheared PVDF-TrFE/metal capacitor.

Original languageEnglish
Pages (from-to)4148-4154
Number of pages7
JournalMacromolecules
Volume42
Issue number12
DOIs
Publication statusPublished - 2009 Jun 23

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All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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