| Because of its benefits of ease of preparation,strong stability,and high biosafety,ZnO,as one of the typical representatives of wide-bandgap(3.37 eV)semiconductors,has gotten a lot of attention.ZnO has excellent piezoelectric and photocatalytic properties as a functional material.In this article,we focus on these two characteristics of ZnO materials.Firstly,using electrospinning technology and hydrothermal in-situ growth technology,a highly sensitive hierarchical wireless piezoelectric sensor was manufactured,and the piezoelectric sensor was used in football player training monitoring.Sensors with high sensitivity are critical for reliably tracking tiny motion changes in real-time,which is impossible with typical sensor devices.By epitaxy growing ZnO nanosheets on the surface of electrospun polyvinylidene fluoride hexafluoropropylene(PVDF-HFP)nanofiber,a hierarchical PVDF-HFP/ZnO composite nanofiber piezoelectric sensor with high sensitivity was created in this research.It has a sensitivity of 1.9 V kPa-1 and a response time of 20 ms,is suited for stresses of 0.02 to 0.5 N,and has outstanding durability and stability of up to 5000 cycles,according to studies.Furthermore,the sensor can detect even the tiniest changes in a player’s movement,preventing injuries caused by overtraining.It also uses low-power Bluetooth technology to track an athlete’s training and wirelessly transfers the results to a smartphone app.In the realms of medical treatment,rehabilitation medicine,and sports safety,this study demonstrates a practical method for high-precision detection and safety monitoring.Secondly,ZnO/NiO heterojunction nanofiber membranes with different Zn/Ni molar ratios were successfully prepared by electrostatic spinning.The microstructure of nanofibers were characterized by scanning electron microscopy,transmission electron microscopy and X-ray photoelectron spectroscopy.ZnO/NiO heterojunction nanofiber films show excellent photocatalytic performance for Congo red,especially under ultrasonic and simulated solar irradiation.The degradation rate of Congo red reached 100%after 40 min,and the degradation constant was 0.064 min-1.The catalyst maintained high photocatalytic activity over five cycles.In addition,the heterojunction nanofiber membrane has a good antibacterial effect on Escherichia coli and Staphylococcus aureus,and the antibacterial zone width is more than 8 mm.Superoxide and hydroxyl radicals play an important role in the degradation of pollutants and sterilization of heterojunction nanofiber membranes.This work is of great significance for studying the potential application of nanofibers in wastewater treatment. |
