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Article

Hot Plate Annealing at a Low Temperature of a Thin Ferroelectric P(VDF-TrFE) Film with an Improved Crystalline Structure for Sensors and Actuators

1
Low Dimensional Materials Research Centre, Department of Physics, University of Malaya, Kuala Lumpur 50603, Malaysia
2
Nanotechnology and Advanced Materials Research Centre, University of Technology, Baghdad 10066, Iraq
*
Authors to whom correspondence should be addressed.
Sensors 2014, 14(10), 19115-19127; https://doi.org/10.3390/s141019115
Received: 28 August 2014 / Revised: 8 October 2014 / Accepted: 9 October 2014 / Published: 14 October 2014
(This article belongs to the Section Chemical Sensors)
Ferroelectric poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) copolymer 70/30 thin films are prepared by spin coating. The crystalline structure of these films is investigated by varying the annealing temperature from the ferroelectric phase to the paraelectric phase. A hot plate was used to produce a direct and an efficient annealing effect on the thin film. The dielectric, ferroelectric and pyroelectric properties of the P(VDF-TrFE) thin films are measured as a function of different annealing temperatures (80 to 140 °C). It was found that an annealing temperature of 100 °C (slightly above the Curie temperature, Tc) has induced a highly crystalline β phase with a rod-like crystal structure, as examined by X-ray. Such a crystal structure yields a high remanent polarization, Pr = 94 mC/m2, and pyroelectric constant, p = 24 μC/m2K. A higher annealing temperature exhibits an elongated needle-like crystal domain, resulting in a decrease in the crystalline structure and the functional electrical properties. This study revealed that highly crystalline P(VDF-TrFE) thin films could be induced at 100 °C by annealing the thin film with a simple and cheap method. View Full-Text
Keywords: ferroelectric copolymers; crystallinity; dielectric; pyroelectric ferroelectric copolymers; crystallinity; dielectric; pyroelectric
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MDPI and ACS Style

Mahdi, R.I.; Gan, W.C.; Majid, W.H.A. Hot Plate Annealing at a Low Temperature of a Thin Ferroelectric P(VDF-TrFE) Film with an Improved Crystalline Structure for Sensors and Actuators. Sensors 2014, 14, 19115-19127. https://doi.org/10.3390/s141019115

AMA Style

Mahdi RI, Gan WC, Majid WHA. Hot Plate Annealing at a Low Temperature of a Thin Ferroelectric P(VDF-TrFE) Film with an Improved Crystalline Structure for Sensors and Actuators. Sensors. 2014; 14(10):19115-19127. https://doi.org/10.3390/s141019115

Chicago/Turabian Style

Mahdi, Rahman I., W. C. Gan, and W. H.A. Majid. 2014. "Hot Plate Annealing at a Low Temperature of a Thin Ferroelectric P(VDF-TrFE) Film with an Improved Crystalline Structure for Sensors and Actuators" Sensors 14, no. 10: 19115-19127. https://doi.org/10.3390/s141019115

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