摘要
摩擦层的介电性能是影响摩擦纳米发电机(triboelectric nanogenerator,TENG)输出性能的关键因素之一.本文选择WO_(3)纳米颗粒作为TENG摩擦层的填充材料,改变La的掺杂比例来调节WO_(3)的介电常数,从而调控TENG摩擦层介电性能,并研究对TENG输出的影响.研究结果表明:掺入La^(3+)、WO_(3)颗粒的晶体结构和晶粒尺寸未见明显变化,但能够有效提高WO_(3)的相对介电常数,使其从5.61提高到10左右.掺杂比为1%的La:WO_(3)纳米颗粒填充后PDMS复合膜的相对介电常数从3.32提高到4.07,TENG的输出提高了约1倍.此外,本文探讨并建立了TENG转移电荷与复合膜介电常数的物理模型.
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 WO_(3)nanoparticles as fillers for the TENG friction layer,and optimized the dielectric constant of WO_(3)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 WO_(3)and the La doping ratio,the effect of La:WO_(3)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 WO_(3)nanoparticle,but it can effectively increase the relative dielectric constant of WO_(3)from 5.61 to about 10,the relative dielectric constant of the PDMS composite friction layer prepared by La:WO_(3)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.
作者
谢远航
娄永
邓君
沈剑聪
陈杰
杨晓红
万步勇
Yuanhang Xie;Yong Lou;Jun Deng;Jiancong Shen;Jie Chen;Xiaohong Yang;Buyong Wan(Chongqing Key Laboratory of Photo-Electric Functional Materials,College of Physics and Electronic Engineering,Chongqing Normal University,Chongqing 401331,China)
出处
《科学通报》
EI
CAS
CSCD
北大核心
2024年第14期1957-1966,共10页
Chinese Science Bulletin
基金
重庆市教委重点科技项目(KJZD-K202200505)资助。
