Research On Flexible Triboelectric Nanogenerator Based On Hydrogel And Its Applicatio

In recent years,various types of sensors and energy devices required by sensors have emerged in an endless stream,among which flexible sensors with transparency,stretchability,biocompatibility and self-healing have attracted widespread attention.However,most of the energy devices that provide power to sensors are rigid,and the research on integrated fully flexible electronic devices still has a long way to go.The invention of triboelectric nanogenerators(TENGs)provides an innovative idea for the development of flexible electronic devices.TENG not only could be used as an energy device,but also could be used as a self-powered sensor to monitor environmental changes or human movement.The combination of flexible materials and the self-powered properties of TENG has broad application prospects in the field of multifunctional wearables.Among various flexible materials,hydrogels with transparent,soft,excellent mechanical properties and self-healing properties have been widely used in electrodes of TENGs.However,some challenges still existed in the application of TENGs.For example,the malleability and conductivity of the electrode could not be taken into account at the same time and TENG was corroded in harsh environment,which may lead to degradation of TENG performance and even equipment damage.Based on this,this thesis mainly introduces the hydrogel-based flexible triboelectric nanogenerator and its application research.Firstly,a transparent,stretchable,and recyclable triboelectric nanogenerator(RTENG)based on acid-alkali-resistant hydrogels was designed.β-cyclodextrin(β CD)was introduced into the Polyacrylamide(PAAm)hydrogel system,resulting in PAAm-βCDNa Cl hydrogel with increased stretchability and environmental stability.As the R-TENG electrode,the PAAm-βCD-Na Cl hydrogel could effectively resist strong acid and alkali environment.In addition,the swelling property of hydrogel was applied to the nanogenerator for the first time,and the first recyclable triboelectric nanogenerator was produced,which can be recycled after dehydration,providing a new idea for the design of environmentally friendly devices.R-TENG could not only be used as an energy device with a peak output voltage of 300 V,but also as a strain sensor to monitor human motion,which showed R-TENG has a good application prospect in the field of flexible wearable.Secondly,a stretchable triboelectric nanogenerator(H-TENG)based on self-healing and adhesive hydrogel was designed.Polyacrylamide(PAAm),β-cyclodextrin(βCD)and polyethylene imine(PEI)were combined for the first time.The prepared hybrid hydrogel could be quickly healed within 2 seconds without external stimulation after fracture,and its tensile strain could reach 80% of that before fracture.The hydrogel also had good adhesion and could adhere to different surfaces such as metal,plastic and glass.The voltage and current of the H-TENG could reach 600 V and 1.5 μA,confirming the potential application of H-Teng in electronic skin and wearable electronic devices.