Orientational imaging in polar polymers by piezoresponse force microscopy

Pankaj Sharma; Dong Wu; Shashi Poddar; Timothy J. Reece; Stephen Ducharme; Alexei Gruverman

doi:10.1063/1.3623765

Orientational imaging in polar polymers by piezoresponse force microscopy

Pankaj Sharma, Dong Wu, Shashi Poddar, Timothy J. Reece, Stephen Ducharme, Alexei Gruverman

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Abstract

We report orientational imaging of the polarization distribution in nanostructured ferroelectric copolymer of polyvinylidene fluoride- trifluoroethylene (PVDF-TrFE) and collagen fibrils using vertical and lateral modes of piezoresponse force microscopy (PFM). In PVDF-TrFE, detection of azimuthal variations in the lateral PFM signal is attributed to the alignment of the molecular chains along different directions. Local switching in PVDF-TrFE is shown to proceed via 120° or 180° rotation of dipoles around the molecular chain, depending upon the strength of the applied electric field. Analysis of the vertical and lateral PFM signals in collagen reveals polar anisotropy of the electromechanical properties along the axes of the fibrils. The surface plots of the piezoelectric response are constructed for both materials based on their piezoelectric tensors and are shown to be consistent with the observed vertical and lateral PFM maps.

Original language	English
Article number	052010
Number of pages	6
Journal	Journal of Applied Physics
Volume	110
Issue number	5
DOIs	https://doi.org/10.1063/1.3623765
Publication status	Published - 1 Sept 2011
Externally published	Yes

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title = "Orientational imaging in polar polymers by piezoresponse force microscopy",

abstract = "We report orientational imaging of the polarization distribution in nanostructured ferroelectric copolymer of polyvinylidene fluoride- trifluoroethylene (PVDF-TrFE) and collagen fibrils using vertical and lateral modes of piezoresponse force microscopy (PFM). In PVDF-TrFE, detection of azimuthal variations in the lateral PFM signal is attributed to the alignment of the molecular chains along different directions. Local switching in PVDF-TrFE is shown to proceed via 120° or 180° rotation of dipoles around the molecular chain, depending upon the strength of the applied electric field. Analysis of the vertical and lateral PFM signals in collagen reveals polar anisotropy of the electromechanical properties along the axes of the fibrils. The surface plots of the piezoelectric response are constructed for both materials based on their piezoelectric tensors and are shown to be consistent with the observed vertical and lateral PFM maps.",

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AU - Wu, Dong

AU - Poddar, Shashi

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AU - Ducharme, Stephen

AU - Gruverman, Alexei

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AB - We report orientational imaging of the polarization distribution in nanostructured ferroelectric copolymer of polyvinylidene fluoride- trifluoroethylene (PVDF-TrFE) and collagen fibrils using vertical and lateral modes of piezoresponse force microscopy (PFM). In PVDF-TrFE, detection of azimuthal variations in the lateral PFM signal is attributed to the alignment of the molecular chains along different directions. Local switching in PVDF-TrFE is shown to proceed via 120° or 180° rotation of dipoles around the molecular chain, depending upon the strength of the applied electric field. Analysis of the vertical and lateral PFM signals in collagen reveals polar anisotropy of the electromechanical properties along the axes of the fibrils. The surface plots of the piezoelectric response are constructed for both materials based on their piezoelectric tensors and are shown to be consistent with the observed vertical and lateral PFM maps.

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Orientational imaging in polar polymers by piezoresponse force microscopy

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