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Effects of annealing conditions on ferroelectric nanomesa self-assembly

Mengjun Bai1, Matt Poulsen and Stephen Ducharme

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We report the results of studies of the effects of annealing conditions on the morphology of ferroelectric nanomesas. The nanomesa patterns were fabricated by self-assembly from continuous ultra-thin Langmuir–Blodgett films of copolymers of vinylidene fluoride and trifluoroethylene. Annealing in the paraelectric phase induced surface reorganization into disc-shaped ferroelectric nanomesas approximately 9 nm thick and 100 nm in diameter. Several factors affect the nanomesa dimensions, such as polymer composition, substrate material, deposition conditions, and annealing temperature. The height and diameter of the nanomesas both increase with increasing annealing temperature. Annealing studies in the ferroelectric–paraelectric coexistence region show that only the paraelectric phase is mobile. From this we conclude that the paraelectric phase supports a kind of plastic crystalline flow connected with dynamic disorder of the polymer conformation.


PACS

81.16.Dn Self-assembly

68.47.Pe Langmuir-Blodgett films on solids; polymers on surfaces; biological molecules on surfaces

68.55.-a Thin film structure and morphology

81.16.Rf Nanoscale pattern formation

77.84.Jd Polymers; organic compounds

81.40.Ef Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization

Subjects

Soft matter, liquids and polymers

Surfaces, interfaces and thin films

Condensed matter: structural, mechanical & thermal

Nanoscale science and low-D systems

Dates

Issue 31 (9 August 2006)

Received 23 January 2006, in final form 20 June 2006

Published 21 July 2006



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