Research On Semi-flexible To Flexible Devices Based On Triboelectric Nanogenerators For Safety Monitoring And Wound Healing

There is a lot of surplus mechanical energy in the environment in which we live,such as the gentle breeze,human movement,muscle stretching,sound fluctuations,vibration caused by breathing,and the flow of blood.Because these tiny energy,is not easy to be seen,so all the energy used are usually regarded as waste of energy,however,this has prompted some researchers think that if we can put these energy collected and convert it into electricity,as has been a wide range of application of solar power,hydroelectric power station,etc.,directly stored in the radio electronic devices for its use,will to a great extent,solve the problem of part of the energy.It is in this context that nanogenerators come into being.Triboelectric nanogenerator(TENG),as the main force in the development of nanogenerators,works mainly based on contact electric effect and electrostatic induction effect.After years of development,it has been designed in various working forms and can be applied to a variety of fields,which is a major turning point in environmental energy reuse.The waste energy in living environment is varied,so the form of devices used to collect energy also varies according to the specific situation.Therefore,it has been an urgent research topic to explore devices used to collect different mechanical energy and broaden their application fields.On the basis of the research on the TENG,this article firstly introduces the nanogenerator and the TENG and summarizes the research status.Secondly,the four working modes and corresponding structural design and application of the TENG are summarized.Finally,The specific content of the experiment is introduced through a combination of experiment and simulation.The contents is as follows:(1)A one-dimensional semi-flexible tensile TENG based on copper and latex tubes is designed to prove that it can be used as a sustainable energy source,which can obtain tensile mechanical energy and actively detect some mechanical stimuli around it.In addition,a sensor square frame consisting of four TENG units proved to be a viable self-powered electronic fence that can effectively monitor environmental collisions from different directions.Moreover,the landslide simulation experiment shows that tensile TENG can detect different geological activities,which is directional selectivity and convenient for geological hazard monitoring.This work further expands the application of TENG,especially in safety engineering and geological monitoring.(2)A flexible TENG structure made of a double-layer PDMS membrane and a conductive hydrogel was designed to obtain and convert energy from a contact-separated operating mode in a system integrated with a fabric.The proximity and separation of the leather fabric enables the system to achieve an output of up to 12.5V.Two soft PDMS film layers were used to packed the hydrogel film to form a sandwich structure to make the output continuous and unattenuated.The physical properties of the material and the energy conversion process of TENG were studied.It is found that the output voltage of 1?3 V can be obtained when the device is placed on the joints of human body by slight movement.Furthermore,the device doped with silver nanowires(Ag NWS)in the lower PDMS was attached to the wound of the experimental mice,and the wound healing time of the mice was advanced,which proved the feasibility of constructing the wearable Tag as a medical electrical stimulation device.