研究目的
To study dielectric and piezoelectric properties of films of pure poly(vinylidene fluoride-trifluoroethylene) copolymer [P(VDF-TrFE)] and P(VDF-TrFE) containing 2% of carbon nanotubes [P(VDF-TrFE) + 2% CNT].
研究成果
Incorporation of 2% carbon nanotubes into P(VDF-TrFE) copolymer enhances its dielectric and piezoelectric properties, as evidenced by increased permittivity and piezoelectric coefficient, reduced surface roughness, and altered phase transition behavior. This improvement is attributed to electroconductive CNT inclusions and migration polarization at the polymer-CNT interface. The findings suggest potential for advanced applications in nanoelectronics and sensor technologies, with recommendations for future studies on varying CNT concentrations and deeper mechanistic insights.
研究不足
The study is limited to a specific composite with 2% CNT concentration; other concentrations or types of nanomaterials were not explored. The mechanisms behind certain observations, such as the additional relaxation process in pure copolymer, require further investigation. The experiments were conducted under controlled laboratory conditions, which may not fully represent real-world applications.
1：Experimental Design and Method Selection:
The study involved synthesizing film samples of P(VDF-TrFE) copolymer and its composite with 2% CNT, followed by characterization of dielectric and piezoelectric properties. Methods included solution crystallization, dielectric measurements, and scanning probe microscopy.
2：Sample Selection and Data Sources:
Samples were prepared from P(VDF-TrFE) powder with 30% trifluoroethylene dissolved in a dimethyl sulfoxide/acetone mixture. CNT were added to form a homogeneous suspension.
3：List of Experimental Equipment and Materials:
Equipment included a thermostated stage for film preparation, equipment for spraying aluminum electrodes, an MFP-3D scanning probe microscope with an Asyelec-01 cantilever for PFM, and software (Gwyddion) for data processing. Materials included P(VDF-TrFE) copolymer, carbon nanotubes, dimethyl sulfoxide, acetone, and aluminum for electrodes.
4：Experimental Procedures and Operational Workflow:
Films were crystallized from solution on a horizontal thermostated stage at 373 K for 2-3 hours. Aluminum electrodes were sprayed onto samples. Dielectric properties were measured at 1 MHz from 250-415 K. Surface visualization and piezoelectric measurements were performed using PFM at room temperature, with voltage varied from -100 to 100 V.
5：Data Analysis Methods:
Data were analyzed using Gwyddion software for microscopy images. Dielectric and piezoelectric parameters were calculated from measured values, including permittivity, phase transition temperatures, and effective piezoelectric coefficients.
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