Study On Micro-nano Regulation Based On PDMS Composite Friction Layer And Its Improvement Of Output Performance Of Triboelectric Nanogenerator

In recent years,triboelectric nanogenerator（TENG）based on the coupling of electrostatic induction effect and triboelectrification effect has flourished,due to its low frequency vibration and good for the tiny vibration response,has been increasingly used to collect the surrounding environment machinery and all kinds of sensors.At present,the research on the friction electric nanogenerator is mainly focused on two aspects:first,the design optimization of electrode structure;the second is the modification of the friction material,the purpose of which is to maximize the energy density and maximize the conversion efficiency.As such as biomedical sensor based on TENG technology such as electronic skin and human-computer interaction sensor sensing equipment development,people have more expectations can improve the biological friendly TENG surface charge density to improve the output performance of TENG,to expand its application.The surface charge density of the friction layer is an important parameter of TENG,and the surface charge density of the friction material of TENG can improve the performance of TENG fundamentally.As a member of the electret polydimethylsiloxane（PDMS,[Si（CH₃）₂O]n）,because it has a high plasticity,high transparency,strong flexibility,high electronegativity and the advantages of good biological compatibility,often as a preferred material production TENG.Previous studies on TENG based on PDMS have focused on structural design and electrochemical modification.This paper,from such as dielectric modulation,regulation and set up within the space charge region of electronegative multi-angle micro-nano control to increase the charge density of TENG friction materials,which greatly increase the output of the TENG and explore the related mechanism,the main research work is as follows:（1）NaNbO₃-PDMS TENG（N-TENG）devices are fabricated via dispersing cubes-NaNbO₃,a lead-free piezoelectric material with oxygen molecular dangling bonds on its crystal surface,into the PDMS at different mass ratios.When the mass ratio is 7 wt%,the highest output performance of N-TENG is obtained.The open-circuit voltage is 550 V,short-circuit current is 16μA,and the effective power densities reach up to 5.5 W m^-2 at the load resistance of¹00 MΩ.The N-TENG has been used to assemble a self-powered electronic watch and illuminate commercial light-emitting diodes（LEDs）,respectively.In the meantime,the fundamental mechanism of the N-TENG has been discussed detailedly from the perspectives of dielectric modulation and electronegative modification.This N-TENG technology reveals a splendid candidate to be applied in large-scale device fabrications,flexible sensors and biological devices thanks to its easy fabrication process,low consumption,high output power density and biocompatibility.（2）Internal space charge zones are built through imbedding ravines and gullies criss-cross gold layers in near-surface of tribo-layer,which leads to the high output performance of TENG.As experimental results,the transfer charge density of gold-PDMS TENG（G-TENG）reaches to 168μC/m².Through theoretical analyses,gold layers act as the passageways and traps of the triboelectric charges when drifting to the internal space of tribo-material.Moreover,the transport,storage process of triboelectric charges in the frictional layer are investigated comprehensively by quantum tunneling for the first time.And the calculation method of output current of TENG is proposed,the theoretical calculation results coincide with the test results well.The results verify the application of the theoretical model and help with the construction and development of theoretical system of TENG.Meanwhile,the relative results can be directly attained by this new theoretical model and it is possible to make full use of the theoretical analysis to achieve better performance of TENG.This study paves an easy and novel way for enhancing the charge density of tribo-layer by internal space construction and new basic theoretical model.