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

doi:10.1021/ma900422n

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 journal › Article › peer-review

49 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 language	English
Pages (from-to)	4148-4154
Number of pages	7
Journal	Macromolecules
Volume	42
Issue number	12
DOIs	https://doi.org/10.1021/ma900422n
Publication status	Published - 2009 Jun 23
Externally published	Yes

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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10.1021/ma900422n

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

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.",

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AU - Jung, Hee Joon

AU - Chang, Jiyoun

AU - Park, Youn Jung

AU - Kang, Seok Ju

AU - Lotz, Bernard

AU - Huh, June

AU - Park, Cheolmin

PY - 2009/6/23

Y1 - 2009/6/23

N2 - 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.

AB - 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.

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ER -

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

Abstract

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