Synthesis of copper/cross-linked poly(vinyl alcohol)(PVA)nanocables via a simple hydrothermal route

摘要

Cross-linking reaction of poly(vinyl alcohol)(PVA)can be initiated in the presence of copper ions,resulting in the formation of copper@cross-linked PVA nanocables by a one-step hydrothermal approach.In contrast to our previous findings in the case of silver ions,metal ions with high valency are more difficult to reduce during the cross-linking reactions under hydrothermal conditions.The variation of pH value during the reaction has significant effects on the quality of the product.Copper@cross-linked PVA nanocables with a diameter of 0.5-1 mum and length up to 100 mum can be obtained at 200 deg C,accompanying the presence of some cross-linked PVA aggregates with near spherical shape and irregular shape.The pH value,reaction temperature,and reaction time play key roles in the formation of such nanocables.The results demonstrated that the cross-linking reaction in the presence of different metal ions has different reaction rates,which determine the uniformity of the product and the quality of the cable-like core-shell structures.