Hybrid Energy Harvester Consisting of Piezoelectric Fibers with Largely Enhanced 20 V for Wearable and Muscle-Driven Applications

Abstract

We present a polyvinylidene fluoride (PVDF) nanogenerator (NG) with advantages of direct writing and in situ poling via near-field electrospinning (NFES), which is completely location addressable and substrate independent. The maximum output voltage reached 20 V from the three layers piled NGs with serial connections, and the maximum output current can exceed 390 nA with the parallel integration setup. Linear superposition and switching polarity of current and voltage tests were validated by the authentic piezoelectric output. Nanofiber (NF)-based devices with a length ∼5 cm can be easily attached on the human finger under folding-releasing at ∼45°, and the output voltage and current can reach 0.8 V and 30 nA, respectively. This work based on NFs can potentially have a huge impact on harvesting various external sources from mechanical energies.

Self-Powered Pressure Sensor with fully encapsulated 3D printed wavy substrate and highly-aligned piezoelectric fibers array

“…Due to the spinnability of PVDF solution, the diameters of as-spun PVDF fibers might range from hundreds nm to several μm 36 . The continuous deposition of PVDF NMFs was fabricated under restricted operating region at the sacrifice of diameter variation of NMFs which was identified in previous research 37 . In order to validate the evidence of the aligned dipoles and related piezoelectric property, we collected the spectroscopic evidence of Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) in Supplementary Information Figures S1 and S2 respectively.…”

A fully packaged self-powered sensor based on near-field electrospun arrays of poly(vinylidene fluoride) nano/micro fibers

“…Figure 2c shows the SEM photos of as-spun PVDF fibers have diameters ranging from 700 nm to 2.5 μm. The diameter of NFES fibers could range from several micro meters to hundred nano meters due to the spin-ability of PVDF solution as identified before [27]. Figure 2d shows an enlarged SEM image of one PVDF fiber, which has a minimum diameter about 0.75 μm.…”

“…The piezoelectric BaTiO 3 have been investigated as a function of ceramic filler content such that the larger filler average sizes, the generated power decreases for filler contents above 5% due to increase of the mechanical stiffness [26]. With above-mentioned advantageous characteristics, PVDF piezoelectric MNFs have previously been demonstrated as human motions sensors [27]. A variety of human-induced motions such as walking step, vocal cord vibration, heart beating and muscle movement can be differentially detected [28][29][30][31].…”

Flexible hybrid eu3+ doped P(VDF-HFP) nanocomposite film possess hypersensitive electronic transitions and piezoelectric throughput

“…As practical PNG are expected to integrate with different types of environmental vibrations and pressure impact such as walking, running, foot stamping, talking, transportation, eye-ball motion, mussel driven application, even motions from body fluids, heart pulse, respiratory motion, and so forth, 22,23,[48][49][50][51][52] we tested our PNG under the simple repeated finger touch and release motions with the impacting pressure amplitude of $ 10.4 kPa (Supporting Information, Text S2). It shows the open-circuit voltage of 5 V and short circuit current of 0.3 lA.…”