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Queen Mary University of LondonQueen Mary University of London
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School of Engineering and Materials Science
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PhD Thesis: Processing and characterization of aligned ferroelectric PVDF-TrFE thin films

Author: MOHD DAHAN, Rozana

Year: 2009

Supervisor(s): Mike Reece

The main interest in this research was to investigate the ferroelectric properties of unaligned and aligned PVDF-TrFE thin films (72-28, 65-35 and 51-49 mol %). The films were fabricated by spin coating on glass substrates with and without aligned PTFE films. The PVDF-TrFE films were aligned on the PTFE films as characterized qualitatively by birefringence in Polarized Light Microscopy. The alignment of PVDF-TrFE/PTFE films was enhanced by annealing at temperatures predetermined by Differential Scanning Calorimetry (DSC).

The ferroelectric properties of the 72-28 PVDF-TrFE/PTFE films on gold coated glass substrates were studied by Polarization-Electric Field (P-E) loop measurements. A layer of octadecyitriclosilane (OTS) or tetracosane (TC) was deposited between the PTFE and 72-28 PVDF-TrFE layers in order to increase the electrical strength of the films. The effect of OTS and TC on the polarization-field reversal loops for the PVDF-TrFE films, with and without PTFE was studied.