Study On The Synthesis And Application Of Silver Nanowires And Its Functional Composite Fibers

As we all know,since the beginning of the new century,current energy shortages and environmental pollution have become the most important problems for us.With the increase of CO2 in the atmosphere,the global greenhouse effect is getting worse and worse.Heating consumes large amount of energy and is a primary source of greenhouse gas emission.Although energy-efficient buildings are developing quickly based on improving insulation and design,a large portion of energy continues to be wasted on heating empty space and nonhuman objects.If heating and insulation could be managed directly based on humans,a vast amount of energy could be saved.This optimal energy-saving approach is called "personal thermal manageme".A personalthermal management device should be wearable just like normal clothes and capable of reducing the loss of body heat or even raising the body's temperature if desired.Here,we successfully prepared the AgNWs/PVDF composite fibers.Metallic nanowires have great potential to reduce the energy used on indoor heating because of its personal thermal management capabilities,it can reflect the infrared radiation back into the human body.As a kind of thermoplastic fluorocarbon,PVDF has the excellent weather resistance,pollution resistance and chemical stability,so it is widely used in coatings and outdoor protective films.One-dimensional(1D)metal nanorods and nanowires hold interesting applications in the area of nanoelectronics because of their potential use as interconnects in nano-optoelectronic devices.However,surface effects from contaminants and oxidation may strongly influence the performance of such metallic nanowires.Contamination of the metallic nanowires can be prevented by enclosing the nanowires in an insulating sheath.Obviously,the composite nanomaterials with nanowires as the core will have a very exciting wide application performance.Exposure to sunlight is unavoidable for normal clothes.Some properties such as strength,color,luster could be influenced by lightening,and the ultraviolet ray also can harm human's body through clothes.PVDF not only has good chemical corrosion resistance,high temperature resistance,oxidation resistance,but also has uv resistance.TiO2,as a better ultraviolet absorber,can absorb ultraviolet light,reduce the generation of free radicals and prevent the degradation of polymer chain,thus achieve the effect of sunscreen and anti-aging.Besides,TiO2 is a kind of low cost,green environmental protection,light absorption ability of the semiconductor optical catalyst.In this paper,we raised a new idea of preparing silver nanowires and its composite nanofibers.The main contents of the dissertation are as follows:1).Silver nanowires were prepared by the modified polyol method.The effects of temperature,molar ratio of PVDF to AgNO3,and the molecular weight of PVDF on the morphology of silver nanowires were investigated.The morphology and microstructure of the as-prepared silver nanowires were analyzed by scanning electron microscopy(SEM),transmission electron microscopy(TEM),and X-ray diffraction(XRD).2).Direct electrospinning of AgNWs/PVDF composite nanofibers.Combine the SEM of charge contrast,TEM and the mapping figure of silver elemental can clearly identify the structure of AgNWs/PVDF composite nanomaterials.Besides,The effectsof different silver nano wire concentrations on AgNWs/PVDF composite nanofibers the formation of AgNWs/PVDF composite nanofibers in electrostatic spinning and its related applications were also studied.3).On the basis of 2),a combination of electrospinning followed by hydrothermal treatment was used to fabricate Ti02/AgNWs/PVDF composite nanofibers.In addition,tio2 was loaded in different hydrothermal environments and the properties of composite fibers were discussed.