Piezoelectric Properties Of Electrospun Arrayed Fibers And Composite Nanofiber Membranes

Electrospinning technology can be traced back to 1902.Advances in nanotechnology,it has attracted wide attention all over the world.Due to many special advantages,electrospinning technology and electrospun nanofibers have many applications and potential application values.The demand for energy from increasingly advanced personal electronic devices is increasing.Lightweight electronic devices also require energypowered devices to move toward lightweight and wearable directions.This paper discusses two parts,one is the preparation of controllable spiral fibers and related technology improvements;the other is to explore the piezoelectric properties of electrospun composite nanofiber membranes.First of all,we use the near-field electrospinning device to obtain a spiral fiber array with good arrangement effect and controllable morphology.By adjusting the strength of spinning voltage,the helical fibers with different morphological characteristics were obtained.Make up for the shortcomings caused by linear fibers.Compared with the previous report,the near-electrospinning spiral fiber has a clearer spiral structure and a more neat array arrangement.The morphological characteristics of the fibers showed regularity with the increase of spinning voltage.It is confirmed that the physical force caused by the electrically driven non-axisymmetric bending instability caused by the charged jet is the main reason for the spiral fiber.It helps to promote the development of organic / inorganic nanofibers in flexible nanodevices and nanologic circuits.It opens up an effective way for the integration of array spiral fibers and functional equipment.At the same time,based on the near-field electrospinning technology,the influence of the additional auxiliary conductive device on the fiber formation effect was explored.An in-situ fixed-point spinning auxiliary device was developed and designed.It effectively suppresses the premature generation of unstable motion caused by charged jet whip,increases the spinning distance,and reduces the diameter of electrospun fiber.Compared with the reported near-field electrospun fiber,it has better morphology and controllable fiber deposition.Effectively improve the working capacity of the near-field electrospinning device.Finally,in order to improve the performance of the nano-generator,a composite PVDFbased nanofiber membrane was prepared by electrospinning technology,and a nanogenerator was assembled based on this.The effect of doping ZnO nanoparticles with different mass fractions on the piezoelectric properties of PVDF-based nanogenerators was investigated.The results show that through compounding,the piezoelectric performance of the PVDF fiber membrane is effectively improved.And with the increase of doping concentration,the piezoelectricity of PVDF / ZnO composite fiber membrane is improved.At the same time,compared to the PVDF nanogenerators previously reported that only focused on their piezoelectricity,we also conducted pyroelectric and bending discharge tests on the composite nanogenerators.After characterization analysis,it was found that as the doping concentration of ZnO nanoparticles increased,the surface of the composite fiber membrane gradually became rough.The fiber diameter gradually becomes uneven,and the fiber as a whole becomes thicker and becomes polarized.The agglomeration phenomenon of ZnO nanoparticles is also more obvious,which intuitively shows that the difference in the output voltage of adjacent cycles gradually becomes larger.The results show that the combination of inorganic metal oxides and organic polymer piezoelectric materials can effectively improve the output characteristics of the nano-generator without changing the flexibility during the period,making it better in the field of flexible nano-generators application prospects.