Controllable Fabrication Of One Dimensional ZnO Based Nanofibers And Their Photocatalytic Activities

One-dimensional nano-ZnO is a typical direct wide bandgap semiconductor material,with high exciton binding energy,high electronic transmission speed and large surface,ZnO was widely used in the photodetector,gas sensor,light emitting diode,photocatalysis,and so on.Due to the diversification of its morphology and excellent physical properties,is a potential material with high efficient in application as photocatalysis.In this work,we mainly care about the controllable preparation of one-dimensional ZnO nanofibers and its photocatalytic efficiency.The ZnO nanofibers were successfully synthesized employing electrospinning,by optimizing process parameters,the controllable preparation of one-dimensional ZnO nanofibers was realized.Then,adding magnesium acetate to precursor solution,Mg doped ZnO nanofibers were successfully prepared,the effect of Mg doping level to the properties of ZnO nanofibers were also discussed.Finally,Ag-loaded ZnO mesoporous nanobelts were successfully synthesized,and their photocatalytic property investigated.The main experimental results of this work are as follows:(1)ZnO nanofibers with high purity and high crystallinity were made by eletrospinning.The voltage,push speed and receive distance in the eletrospinning process proved to be key factors to the formation of nanofibers.In this work,ZnO nanofibers with uniform diameter distribution and morphology were obtained at the voltage of 12 KV,push speed at 0.05 mm/min,receiving distance in 20 cm.By adding TS to ZnAc/PVP precursor solution,ZnO mesoporous nanobelts were successfully prepared.The content of TS proved to be a key factor to the morphology of mesoporous nanofibers.ZnO mesoporous nanobelts were obtained when the dosage of TS at 3 wt %.The increasing of surface area of nanofibers due to the addition of TS.(2)we have demonstrated the exploration of Mg-doped ZnO nanofibers via a facile electrospinning method.The as-prepared Mg-doped ZnO nanofibers possess a well-defined 1D architecture with a high purity in morphology.The Mg-doping levels have been tailored in the range from 2.58 to 9.11 at.% by adjusting the contents of Mg source introduced within the solutions,enabling the growth of the ZnO nanofibers in a controlled manner.The optical band gap of the ZnO nanofibers has been tuned up to 3.40 eV once the Mg-doping level is fixed at 10 at.%,which is mainly attributed to the Moss-Burstein effect.Current work might provide some insight for the fabrication of high-qualified 1D ZnO nanostructures with tailored Mg-doping levels,which allows them to be potentially applied in opto/electric nanodevices.(3)Ag loaded ZnO mesoporous nanobelts were successfully prepared by light deposition,The maximum value of specific surface area reach to 15.27 m2/g,is 1.4 times to the one not loaded ZnO mesoporous nanobelts.It is affirmed that the Ag nanoparticles successfully loaded in the surface of ZnO mesoporous nanobelts by SEM,EDX,XRD and TEM characterization methods.By loaded Ag nanoparticles to the surface of ZnO mesoporous nanobelts,Photocatalytic hydrogen production efficiency of ZnO mesoporous nanobelts up to 970?molg-1h-1,is 2.2 times to the unload ZnO mesoporous nanobelts(442?molg-1h-1).It shows that the right amount of precious metal load can effectively improve the photocatalytic properties of ZnO mesoporous nanobelts.Experimental results indicated that the one dimensional ZnO nanofibers with controllable microstruture were prepared via electrospinning;by doping and loading,the photocatalytic efficiency were obviously raised.