The Study On Modification Of ZnO Nanorods And Application In Functional Cotton Fabric

ZnO is a kind of direct wide band gap semiconductor material with higher band gap（3.37eV）at a temperature of room and larger exciton binding energy（60meV）.ZnO has applicated in the photoelectric materials,functional materials,photocatalyst and biological sensors.In recent years,the maintain and application of ZnO nanorods have become a research hotspot in the field,more and more people pay attention to it.Nowadays,there are many ways to preparate ZnO nanorods,the vast majority of the research work including,Al₂O₃,silicon,ITO conductive glass and other solid substrate as a growth substrate.While the textile fiber surface due to differences in complexity structure and surface properties of textile materials,the technique cannot be well applied to the flexible substrate;at the same time,ZnO also has a wide band gap,recombination rate of photogenerated charge carriers high fastness defects combined with fiber,which are limited to the application of one-dimensional ZnO nanostructures in flexible textile material.To solve these problems,the controllable growth of ZnO nanorods on the surface of textile,doping and finishing in textile function should be With the use of in-depth study.By hydrothermal method,oriented ZnO nanorod arrays were vertically grown onto the surface of cotton fibers which were precoated with layers of ZnO nanocrystals.The effects of the precoated ZnO nanocrystals,the concentration of the hydrothermal solution,hydrothermal temperature,hydrothermal reaction time on the preparation and morphology structure of ZnO nanorod arrays were investigated.The results show that the ZnO nanocrystals onto the cotton fibers are the prerequisite to ZnO nanorod growth.Morphology control of the ZnO nanorod arrays can be achieved by adjusting the hydrothermal reaction conditions.The grown ZnO nanorod arrays on cotton fibers endow the cotton fabrics with remarkable UV-blocking property.In order to solve the defects of ZnO nanorods photocatalytic material,modified ZnO nanorods were prepared by rare earth elements La,Nd and Gd single doped and Co doped ZnO nanorods method to improve the quantum yield,broaden the light response range and improve the photocatalytic activity,and analysis and research of photocatalytic ZnO nanorods after the doping using hybrid orbital theory,the optical response causes the expansion of scope and application fields.The study shows that by doping rare earth elements,which can narrow the band gap,under visible light can also stimulate the photocatalytic ability of ZnO nanorods to broaden the range of light response or reduced light Probability of recombination of electrons and holes,further improve the photocatalytic activity of ZnO nanorods.Compared with undoped or single doped ZnO nanorods doped ZnO nanorods in the UV and visible light has good degradation effect of methylene blue,synergistic effect and photocatalytic activity of modified ZnO nanorods depends mainly on the characteristics of the ions and concentration as well as between.By adding the coupling agent to improve binding fastness of cotton fabric with ZnO nanorods.This paper discusses the coupling agent in improving ZnO nanorods and fabric produced firmly combined process function,and using the direct method and the step method process of two kinds of ZnO nano crystal to cover the surface of cotton fiber,the coupling agent plays"the molecular bridge"between the cotton fiber and ZnO,thereby improving the combination fastness.The results indicate that the combined firm between the cotton fabric and ZnO nanorods were treated by coupling agent,especially the use of cotton fabric finishing process step by step,after washing 10 times the fabric of methylene blue is good photocatalytic effect,the rate of decline was only 1.3%.