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<p>With the advent of the smart technology era, flexible piezoelectric sensors have become essential for information sensing and signal transmission. The objective of this study was to optimize the uniformity of nanofiber patterns using a near-field electrohydrodynamic direct-writing (NFEDW) method to obtain a piezoelectric sensor with better performance. To further understand the physical process, a local model of the printing needle and substrate was established using COMSOL Multiphysics to couple the electrostatic field with the fluid field, and preliminary selection of the parameters and the range of values affecting printing was made. NFEDW parameters including voltage, fluid supply flow rate, printing speed, and printing distance were systematically regulated using a one-factor experimental method. The ideal process conditions were a voltage of 3700&#xa0;V, fluid supply flow of 0.3&#xa0;μL/min, printing speed of 800&#xa0;mm/min, and printing distance of 0.3&#xa0;mm. The resulting polyvinylidene fluoride (PVDF) nanofiber patterns exhibited good homogeneity. Based on this, a flexible piezoelectric sensor was prepared; polyethylene terephthalate (PET) was used as the encapsulation layer, and the electrode was made of copper. The piezoelectric sensitivity and output characteristics were evaluated. The results indicated that the sensitivity was 27.2&#xa0;mV/N, and the response and recovery times were 3.8&#xa0;ms and 3.5&#xa0;ms, respectively. The sensor exhibited good intelligent sensing ability at different vibration frequencies and bending processes.</p>

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Investigation of Processing Parameters for Fabricating PVDF Piezoelectric Sensors Based on Near-Field Electrohydrodynamic Direct Writing

  • 期刊论文

  • 发表日期：

    2025年4月9日

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  • Chuanming Sun,
  • Huifang Liu,
  • Yonglin Wang,
  • Guangkun Shan,
  • Teng Ren

摘要

With the advent of the smart technology era, flexible piezoelectric sensors have become essential for information sensing and signal transmission. The objective of this study was to optimize the uniformity of nanofiber patterns using a near-field electrohydrodynamic direct-writing (NFEDW) method to obtain a piezoelectric sensor with better performance. To further understand the physical process, a local model of the printing needle and substrate was established using COMSOL Multiphysics to couple the electrostatic field with the fluid field, and preliminary selection of the parameters and the range of values affecting printing was made. NFEDW parameters including voltage, fluid supply flow rate, printing speed, and printing distance were systematically regulated using a one-factor experimental method. The ideal process conditions were a voltage of 3700 V, fluid supply flow of 0.3 μL/min, printing speed of 800 mm/min, and printing distance of 0.3 mm. The resulting polyvinylidene fluoride (PVDF) nanofiber patterns exhibited good homogeneity. Based on this, a flexible piezoelectric sensor was prepared; polyethylene terephthalate (PET) was used as the encapsulation layer, and the electrode was made of copper. The piezoelectric sensitivity and output characteristics were evaluated. The results indicated that the sensitivity was 27.2 mV/N, and the response and recovery times were 3.8 ms and 3.5 ms, respectively. The sensor exhibited good intelligent sensing ability at different vibration frequencies and bending processes.