Effects of La-modulated WO3 dielectric constant on the output of a triboelectric nanogenerator
With the rapid development of the Internet of things(IoT),electronic technology is advancing towards miniaturization and integration.As a result,providing continuous power supply to microelectronic devices has become a research hot topic in this field.The triboelectric nanogenerator(TENG)is capable of converting collected environmental energy into electrical energy.As a novel micro power generation device,the TENG holds great potential for various applications.The friction layer is one of the key factors limiting the output performance of the TENG and the chemical bond structure existing in the polymer substrate of the friction layer restricts the improvement of the dielectric properties of the substrate by electronic polarization and atomic polarization.High dielectric nanoparticle fillers can promote interface polarization between the molecules of substrates and nanoparticles in the composite material,thereby enhancing the dielectric characteristic of the entire friction layer.Previous studies have shown that the output performance of the TENG can significantly decrease due to particle agglomeration and the generation of leakage currents when the concentration of nanoparticle fillers in the friction layer exceeds a critical threshold,and there is a rapid decline in the TENG output performance as the filling volume ratio further increases.There is currently no report on controlling the dielectric constant of the nanoparticle filler by doping itself to further enhance the dielectric characteristic of the TENG friction layer,especially under limited filling volume ratio.In this study,we employed WO3 nanoparticles as fillers for the TENG friction layer,and optimized the dielectric constant of WO3 by doping La to achieve the modulation of the dielectric characteristic of the TENG friction layer.We focused on the relationship between the relative dielectric constant of WO3 and the La doping ratio,the effect of La:WO3 filler on the dielectric characteristic of the TENG friction layer and the output of TENG,and the physical model between the relative dielectric constant of the friction layer and the transfer charge of TENG was established.The results indicate that the La-doping ions have no effect on the crystal structure and grain size of WO3 nanoparticle,but it can effectively increase the relative dielectric constant of WO3 from 5.61 to about 10,the relative dielectric constant of the PDMS composite friction layer prepared by La:WO3 nanoparticles as fillers is increased from 3.32 to 4.0 and the output of the TENG is also increased by about 1 times.The physical model of the transfer charge of the TENG and the dielectric constant of the composite film proposed in this paper provides a reliable and effective way to improve the performance of the TENG friction layer.
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