Synthesis Of Copper Nanowires By Liquid-phase Reduction Method And Their Application In Transparent Conductive Films

Nanostructured metals have inspired a great deal of research enthusiasm in recent years due to their excellent properties and broad application prospects.A series of representative examples have shown the potential applications in nano-device interconnection,nano-catalysis,sensors and so on.Noble metal nanowires,especially silver,have received tremendous scientific investigation due to their excellent electron transfer abilities.However,the widely practical applications are seriously limited by their rare storage and high cost.Compared with silver,metallic copper possesses the analogous properties in electrical conductivity,thermal conductivity and mechanical properties.Therefore it is considered as a promising alternative to silver.However,the copper nanostructures are easily oxidized in air,resulting in poor conductivity and mechanical properties,which severely constrain its practical application.In this paper,a kind of polypyrrole coated copper nanowires was prepared by liquid-phase reduction.The obtained copper nanowires showed good oxidation resistance.We explored the growth of copper nanowires and the mechanism of polypyrrole in the preparation process.We also studied the effects of different preparation parameters on the preparation of copper nanowires,and focused on the effects of the heating method,the reaction temperature,incubation time,the addition of reducing agent,the addition of pyrrole and other technical parameters on the morphology and structure of the copper nanowires.Finally,the best experimental scheme for preparing copper nanowires was obtained.We systematically characterized the morphology and structure of the prepared copper nanowires.Characterization results show that the product has a one-dimensional and uniform topography.Copper nanowires have a length of 5-15 ?m and a diameter of 100-200 nm.Copper nanowires were coated with a layer of polypyrrole surface,greatly improving the antioxidant properties of copper nanowires in the air.According to this scheme to enlarge preparation,the morphology of the copper nanowires obtained is good,showing that the scheme is stable and highly reproducible,with the possibility of mass production.Transparent conductive films of copper nanowires were prepared by spin coating method and Meyer blade coating method.We explored the configuration of the dispersion,the process of preparation,and the heat treatment of the conductive film.From the prepared thin film samples,it can be found that the copper nanowires have a smooth surface and are evenly distributed and lapped together to form a random grid of metal nanowires.The properties of the prepared films were characterized,such as the conductivity of the films,the uniformity of the conductivity,the light transmittance,the flexibility and the stability of the films.It is found that the conductive film prepared in this experiment has a good overall performance,especially in terms of flexibility,and has obvious advantages over the conventional ITO flexible conductive film.It suitable for the trend of flexible development of optoelectronic products.