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Electron diffraction study of the structure of vinylidene fluoride–trifluoroethylene copolymer nanocrystals

Mengjun Bai1,2, X Z Li2 and Stephen Ducharme1,2

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The structures of nanocrystals consisting of 70% vinylidene fluoride and 30% trifluoroethylene made by Langmuir–Blodgett deposition were studied using transmission electron microscopy and electron diffraction. Highly ordered nanocrystals with sizes ranging from 100 nm to 4 µm were grown on Langmuir–Blodgett films at a deposition surface pressure of 20 mN m−1. Electron diffraction patterns from individual crystals allowed us to determine the crystal symmetry and lattice parameters. A monoclinic phase had been found with the lattice parameters a = 9.06 ± 0.03 Å,b = 5.18 ± 0.02 Å,c = 20.40 ± 0.05 Å,α = 90° ± 0.3°,β = 93° ± 0.2°,γ = 90° ± 0.2°, consistent with the monoclinic space group C23.


PACS

61.05.J- Electron diffraction and scattering

68.37.Lp Transmission electron microscopy (TEM)

62.50.-p High-pressure effects in solids and liquids

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

61.46.Hk Nanocrystals

Subjects

Surfaces, interfaces and thin films

Nanoscale science and low-D systems

Condensed matter: structural, mechanical & thermal

Dates

Issue 19 (16 May 2007)

Received 22 January 2007, in final form 28 March 2007

Published 19 April 2007



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