Abstract
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.
Highlights
Piezo, pyro- and ferroelectric polymers receive a lot of attention, because of their potential applications in sensors and actuators [1]
The highest intensity peak was achieved at 100 °C, which means that the crystalline structure of the copolymer thin film is the highest
We found that the optimized crystalline structure was achieved at around 100 °C when the thin films were annealed with a hot plate
Summary
Piezo-, pyro- and ferroelectric polymers receive a lot of attention, because of their potential applications in sensors and actuators [1]. The copolymer crystal structure, phase transition behavior and ferroelectric properties are affected by the ratio of VDF/fluoride-trifluoroethylene (TrFE) content and the synthesizing conditions [10]. In view of current economic solicitude, as well as technical compatibility with thermal treatment, low temperature processing is a critical issue to realize the large-area integration of active layers with flexible electronics This platform is important for organic materials, and applicable for. We have focused on improving the crystalline structure of P(VDF-TrFE) 70/30 by annealing the samples with a hot plate In this technique, the heat came only from one direction, i.e., from the bottom of a substrate. The fluctuation in the temperature inside an oven is around ±15 °C, as the heat transferred through air inside an oven comes from many different directions
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