High-performance coaxial piezoelectric energy generator (C-PEG) yarn of Cu/PVDF-TrFE/PDMS/Nylon/Ag

Title
High-performance coaxial piezoelectric energy generator (C-PEG) yarn of Cu/PVDF-TrFE/PDMS/Nylon/Ag
Authors
최원국박민철박동희김정혁주병권김보성김상우강현욱
Keywords
coaxial piezoelectric energy generator; PVDF-TrFE nanofibers; in-plane array; C-PEG yarn; characteristic output V-P curve
Issue Date
2021-01
Publisher
Nanotechnology
Citation
VOL 32-145401-11
Abstract
Coaxial type piezoelectric energy generator (C-PEG) nanofiber was fabricated by a self-designed continuous electrospinning deposition system. Piezoelectric PVDF-TrFE nanofiber as an electroactive material was electrospun at a discharge voltage of 9?12 kV onto a simultaneously rotating and transverse moving Cu metal wire at an angular velocity of ωg = 60?120 RPM. The piezoelectric coefficient d33 of the PVDF-TrFE nanofiber was approximately ?20 pm V?1 . The generated output voltage (VG) increased according to the relationship exp(-αP) (α = 0.41? 0.57) as the pressure (P) increased from 30 to 500 kpa. The VG values for ten and twenty pieces of C-PEG were VG = 3.9 V and 9.5 V at P = 100 kpa, respectively, relatively high output voltages compared to previously reported values. The high VG for the C-PEG stems from the fact that it can generate a fairly high VG due to the increased number of voltage collection points compared to a conventional two-dimensional (2-dim) capacitor type of piezoelectric film or fiber device. C-PEG yarn was also fabricated via the dip-coating of a PDMS polymer solution, followed by winding with Ag-coated nylon fiber as an outer electrode. The current and power density of ten pieces of C-PEG yarn were correspondingly 22 nA cm?2 and 8.6 μW cm?3 at VG = 1.97 V, higher than previously reported values of 5.54 and 6 μW cm?3 . The C-PEG yarn, which can generate high voltage compared to the conventional film/nanofiber mat type, is expected to be very useful as a wearable energy generator system.
URI
http://pubs.kist.re.kr/handle/201004/72725
ISSN
0957-4484
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KIST Publication > Article
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