Irradiation Manipulation Of Charge Density On The Friction Surface Of TENG

In order to avoid the disadvantages of traditional solid-phase friction nanogenerators（TENG）and improve the electrical output performance,a solid-liquid dual-phase friction method was used to fabricate TENG.Gallium indium alloy,as the main substitute material of liquid metal mercury,will be used as the liquid friction material,and the solid phase material is polyimide（PI）.A new method to improve the solid-liquid dual-phase TENG by modifying the surface of solid phase friction material PI by proton irradiation is proposed.Through the investigation of the effects of irradiation dosage,irradiation energy and other parameters on the properties of TENG,and the comparison of the differences and reasons of the effects of proton and electron irradiation on the properties of TENG,the optimal irradiation parameters of Pi and Ga-In eutectic alloy were obtained.Firstly,the solid-phase friction material of solid-liquid dual-phase TENG was determined by comparing the electric properties of PDMS,PI,PET,PTFE and electrospun fiber PCL before and after addition.At the same time,the difference of electrification effect between liquid metal and solution with different concentration/solute as liquid tribolayer was compared.The deionized water was used to replace the easily oxidized Ga-In eutectic alloy.The packaging process of high reliability solid-liquid dual-phase TENG was successfully explored,and the optimal performance of solid-liquid dual-phase TENG and matters for attention were determined by exploring the influence of electrode material,liquid filling ratio,humidity and other factors.Based on PI after irradiation of 2D and 3D surface morphology observation,surface roughness,hardness,elastic modulus,wettability,dielectric properties and surface state of aggregation structure,chemical structure,chemical state of exploration,based on the electronic absorption characteristics of the unsaturated group,in order to change irradiation fluence and irradiation energy cause solid-liquid dual-phase TENG explain the change of the output performance.When the irradiation energy is 120ke V and the injection amount is 1.0×10¹⁶cm^-2,the surface crystallinity of PI is reduced and the activity of unsaturated chemical bonds on the surface is enhanced by proton irradiation,which is the best irradiation parameter to achieve the best output performance of solid-liquid dual-phase TENG by proton irradiation PI.Under the same irradiation energy injection,the different penetrating abilities of protons and electrons based on the simulation may explain the difference of PI and TENG properties caused by proton irradiation and electron irradiation.In the absence of oxygen,Ga-In eutectic alloy was used as liquid friction material to assemble solid-liquid dual-phase TENG with irradiated PI.The open-circuit voltage was about 107.5V,which was increased by 57.4%compared with that without irradiation.The surface modification of Ga-In eutectic alloy by boiling can generate Ga OOH with high electrical properties,which is also of great practical significance In the study of TENG and provides ideas for the wide application of Ga-In eutectic alloy In oxygen-containing environment.