Mechanical Energy‐to‐Electricity Conversion of Electron/Hole‐Transfer Agent‐Doped Poly(Vinylidene Fluoride) Nanofiber Webs

Zhang

et al. 2022

ACS Appl. Nano Mater.

In this paper, to improve the compatibility of poly(vinylidene difluoride) (PVDF) with barium titanate (BaTiO 3 ) and the piezoelectric property of wearable piezoelectric nanogenerators (PENGs), fluorinated BaTiO 3 (F-BaTiO 3 ) nanoparticles were prepared by the simple thermal annealing of BaTiO 3 prepolymer with PVDF powder, a modified composite nanofiber was prepared by electrospinning with a dispersed liquid consisting of F-BaTiO 3 nanoparticles and PVDF solution, and a PENG was prepared with the modified composite nanofiber as a piezoelectric functional material. Scanning electron microscopy (SEM) showed that F-BaTiO 3 nanoparticles were more uniformly dispersed in the modified composite nanofiber than BaTiO 3 nanoparticles, the analysis of Fourier infrared (FT-IR) spectroscopy showed that the β-phase content of the modified composite nanofiber compounded with F-BaTiO 3 (F-BaTiO 3 /PVDF nanofiber) was higher than that of the modified composite nanofiber compounded with BaTiO 3 (BaTiO 3 /PVDF nanofiber), and when the dosage of F-BaTiO 3 nanoparticles was 5 wt %, the β-phase content of the modified composite nanofiber reached the maximum value (91%), which was about three times that of BaTiO 3 /PVDF nanofiber. The output voltage of the PENG could reach as high as 1.5 V under an external force of 2N and does not decrease obviously after 300 cycles in a vertical pressing test. Furthermore, PENG was demonstrated to be sensitive to the detection of human motions, for instance, elbow flexion, hand slapping a table, and walking. These results indicated that by BaTiO 3 being fluorinated with PVDF, the dispersity of F-BaTiO 3 in PVDF nanofiber, the β-phase content of F-BaTiO 3 /PVDF nanofiber, and the output voltage of F-BaTiO 3 /PVDF PENG were improved.

Section: Methodsmentioning

confidence: 99%

“…The roller speed of electrospinning was 1000 rpm. 25,26 The graphic illustration of the preparation of F-BaTiO 3 /PVDF nanofibers is shown in Scheme 1.…”

Section: ■ Introductionmentioning

confidence: 99%

Fluorinated Barium Titanate Nanoparticles for Wearable Piezoelectric Power Generation

Zhang

et al. 2022

ACS Appl. Nano Mater.

“…These Schottky junction-based energy harvesters require no additional rectification circuit and favors the miniaturization and integration of the electronic devices, providing a new route for the self-powered devices and mechanical sensors [123]. Introduction of soft polymeric materials into energy harvesters will enable higher electric output and broaden their applications in flexible devices [79], [145], [146]. It was confirmed that Schottky contact was formed between p-type semiconductor PPy and metal Al and Ohmic contact was formed between the Au and PPy (Fig.…”

Section: B Energy Harvestermentioning

confidence: 99%

Device Based on Polymer Schottky Junctions and Their Applications: A Review

Suo

Zhou

et al. 2020

IEEE Access

Polymeric materials are emerging as an important component for organic electronics due to their combined features of soft materials and organic semiconductor/conductor. Different from solid-state bulk materials, polymers are synthesized and modulated with a facile method, with their controllable properties. Therefore, polymers have been recently used in Schottky junction devices that demonstrate features of enhanced performances, flexibility, and easy processing. Polymer-based Schottky junctions have drawn a lot of interest in several prototype applications like photodetectors, energy harvesters, and gas sensors. With this review, we summarize recent progress in synthesis and modulation of polymers and fabrication of polymer-based Schottky junction devices. Designs of applications of sensory devices like photodetectors, energy harvesters, and gas sensors are also presented.

ACS Appl. Mater. Interfaces

“…A lot of effort has been dedicated by many research groups to improve the electrical output performance of TENGs through new material syntheses, advanced structural designs, mechanical-coupling effects, and so on. Polymers, such as poly(vinylidene fluoride) (PVDF), polypropylene (PP), polyimide, and poly(phenylene sulfide), have attracted extensive interest due to their intrinsic advantages, including high breakdown strength, facile processability, low dielectric loss, and lightness, which make them an excellent option for the TENG application. − Lu et al reported a novel and facile fabrication poling-free dynamic PVDF–Nafion polymeric piezoelectret generator with 14.6 V/cm 2 output. The weakness of their research was focused on the stimulated force and did not deal with the precharging onto their reported device resulted a small voltage outcome .…”

Section: Introductionmentioning

confidence: 99%

Zinc Oxide-Enhanced Piezoelectret Polypropylene Microfiber for Mechanical Energy Harvesting

Zhu

Song

et al. 2018

This paper reports zinc oxide (ZnO)-coated piezoelectret polypropylene (PP) microfibers with a structure of two opposite arc-shaped braces for enhanced mechanical energy harvesting. The ZnO film was coated onto PP microfibers via magnetron sputtering to form a ZnO/PP compound structure. Triboelectric Nanogenerator (TENG) based on ZnO/PP microfiber compound film was carefully designed with two opposite arc-shaped braces. The results of this study demonstrated that the mechanical energy collection efficiency of TENG based on piezoelectret PP microfiber was greatly enhanced by the coated ZnO and high-voltage corona charging method. We found that, with the step-increased distance of traveling for the movable carbon black electrode, an electrical power with an approximately quadratic function of distance was generated by this mechanical-electrical energy conversion, because more PP microfibers were connected to the electrode. Further, with a full contact condition, the peak of the generated voltage, current, and charges based on the ZnO/PP microfibers by this mechanical-electrical energy conversion with 1 m/s reached 120 V, 3 μA, and 49 nC, respectively. Moreover, a finger-tapping test was used to demonstrate that the ZnO/PP microfiber TENG is capable of lighting eight light-emitting diodes.