研究目的
To optimize electrospinning parameters for fabricating piezoelectric PVDF nanofiber webs for passive sensing and energy harvesting applications.
研究成果
The optimization of electrospinning parameters (specifically increasing voltage to 18 kV) maximizes the piezoelectric β-phase content in PVDF nanofibers, enhancing their energy harvesting capability. The fabricated flexible membrane generated up to 250 mV in tapping tests, demonstrating potential for applications in wearable devices and smart skins. Future work could explore broader parameter ranges and real-world deployment scenarios.
研究不足
The study is limited to specific electrospinning parameters (voltage and drum speed) and may not cover all possible variables. The energy harvesting demonstration is based on tapping tests at a constant frequency, which might not represent real-world dynamic conditions. Optimization is focused on piezoelectric properties, potentially overlooking other material characteristics.
1：Experimental Design and Method Selection:
The study involves optimizing electrospinning parameters (voltage and drum speed) using far field electrospinning (FFES) to enhance piezoelectric properties. Characterization includes scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy.
2：Sample Selection and Data Sources:
PVDF powder (MW 534,000) mixed with DMF and acetone to form a 15% (w/v) polymer solution.
3：List of Experimental Equipment and Materials:
Electrospinning setup (Inovenso? with rotating mandrel collector), syringe pump, 18 G needle, FE-SEM (FEI Nova NanoSEM 230), FTIR spectrometer, hot plate magnetic stirrer, hot air oven, National Instruments data acquisition card (NI-DAQ).
4：Experimental Procedures and Operational Workflow:
Polymer solution prepared and electrospun at varying voltages (10, 12, 15, 18 kV) and drum speeds (1000, 1900 rpm). Nanofibers characterized for morphology and β-phase content. Tapping tests conducted at 1 Hz frequency to measure voltage output.
5：Data Analysis Methods:
Nanofiber diameters measured from SEM images, β-phase fraction calculated using Beer-Lambert formula from FTIR spectra, voltage output recorded and analyzed.
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