Research On Construction And Application Of Triboelectric Nanogenerator Based On ZnO-PDMS

The rapid development of flexible wearable devices has gradually entered all aspects of people’s lives,covering various aspects such as fitness exercises,health monitoring,and human-computer interaction.With the general improvement of the quality of life,people have higher requirements for the portability,practicability and use functions of flexible wearable devices.Traditional sensors require an external large-volume power supply,which is generally powered by rechargeable batteries.The subsequent problems of battery charging,device portability,service life,battery recycling,and complex device structure have become a major challenge for wearable sensors.Therefore,it is of great significance to develop a self-powered sensor with the function of collecting human mechanical energy and sensing human physiological signals.By designing a tribological nanogenerator（TENG）based on a vertical contact separation type for sensors and human body mechanical energy collectors,the surface morphology and dielectric properties of the negative friction layer material polydimethylsiloxane（PDMS）are modified.The regulation of negative electricity is carried out and researched.The research results show that the existence of the microstructure on the surface of PDMS increases the deformation and electron transmission channels when the friction layer is in contact,and the tip effect of the microstructure increases the surface charge density of PDMS.Among them,the P400-TENG sensor has a larger voltage under a smaller pressure.It shows a high sensitivity of 17.7 V/k Pa and can be used as a frequency and pressure sensor,and it shows the power supply characteristics of 100 MΩresistance and 0.528 W/m² output power.Explore the influence of the incorporation of zinc oxide nanorods（ZnO NRs）on the dielectric properties and electronegativity of the friction layer PDMS.According to the test results of the dielectric constant,the dielectric constant of the ZnO NRs-PDMS friction layer is significantly increased,which is the result of the combined effect of dipole polarization and interface polarization.According to Kelvin probe force microscopy（KPFM）,the contact potential difference(V_CPD)of the friction layer of ZnO NRs-PDMS is reduced.This is because the existence of a large number of oxygen dangling bonds in ZnO NRs is easy to combine with the fracture of Si-CH₃ in PDMS,which makes free-CH₃ increase,PDMS has a stronger ability to adsorb electrons..Tested that the sensitivity of the 7 wt.%ZnO NRs-PDMS sensor in the pressure range of 0.4 k Pa～6 k Pa is 28.9 V/k Pa,which has better pressure sensitivity.The ultimate power density of the 7 wt.%ZnO NRs-PDMS friction nanogenerator is about 1.909 W/m²,and the internal resistance is 50 MΩ.It can directly light up 200commercial LED lights and power small calculators through a rectifier.It has the ability to combine with some cutting-edge fields such as photodetectors and super capacitors.