Journal
NANO ENERGY
Volume 77, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2020.105178
Keywords
Polyvinylidene fluoride; beta phase; Printer ink; Nanogenerator; Mechanical energy harvester; Self-powered electronics
Categories
Funding
- Six Talent Peaks Project in Jiangsu Province, China [XYDXX-022]
- 100 Foreign Talents Project in Jiangsu Province [JSA2016003]
- National Natural Science Foundation of China, China [11774170, 21975123, 61704076, 61935017]
- Projects of International Cooperation and Exchanges NSFC, China [51811530018]
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Triboelectric nanogenerators (TENGs) are expected to be new energy supply devices for wearable electronics, which have been proven effective in converting biomechanical energy into electrical energy. Polyvinylidene fluoride (PVDF) is a ferroelectric and piezoelectric material for TENGs, with high crystallinity of which could improve the performance of TENGs. In this work, we have developed TENGs based on PVDF in nanofiber (NF) form, which have high crystallinity. Electro-spinning technique was used to grow PVDF NFs. Commercially available printer ink (PI) nano-fillers were added in PVDF NFs to further increase their crystallinity for enhanced output of PVDF-PI NFs based TENGs. Highest beta phase crystallinity of 88%, as quantified by Fourier transform infrared spectroscopy, was obtained for 5 h-grown PVDF-PI NFs, with a TENG performance of 22 W/m(2), more than double that of PVDF NFs counterpart, which is so far the highest recorded value for PVDF NFs based TENGs. This can be attributed to a competition among ferroelectric domain alignment, surface charge density, and NF medium properties. As printer ink contains magnetic materials, the relation of magnetic properties to the 1 phase and the power output as a function of growth time have been discussed. We have also demonstrated that PVDF-PI NFs based TENGs can be efficiently used in several potential applications, such as humidity sensors, and easily integrated into flexible electrical and optoelectronic systems, which may open a new avenue in the era of self-powered electronics.
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