镀银SiO_2纳米纤维的制备及其导电性能的研究

Preparation and electrical conductivity of silver-plated SiO_2 nanofiber

利用纳米二氧化硅(SiO_2)的结构特性,将其作为镀银基体材料,结合静电纺丝技术制备了SiO_2纳米纤维,进一步在其表面沉积多巴胺,再采用硝酸银(Ag NO3)进行镀银处理,得到了镀银SiO_2纳米纤维,研究了镀银SiO_2纳米纤维的表面形貌、结晶结构及导电性能。结果表明:表面沉积多巴胺后的SiO_2纳米纤维有利于接下来的镀银处理,能够在纤维表面形成形貌良好的银纳米粒子镀层;随着Ag NO3浓度的增加,镀银SiO_2纳米纤维的电阻率呈下降趋势,当AgNO_3浓度达到10 g/L时,纤维电阻率下降至0. 1 mΩ·cm,并趋于稳定,纤维表面形成均匀致密的银纳米粒子镀层,具有良好的导电性能。

Nano-silicon dioxide(SiO 2)was used nano-SiO 2 as a carrier for silver plating due to its proper structural characteristics to prepare SiO 2 nanofiber via electrospinning technique.Furthermore,silver-plated SiO 2 nanofibers were obtained by depositing dopamine on the surface of SiO 2 nanofiber prior to silver plating with silver nitrate(AgNO 3).The surface morphology,crystalline structure and electrical conductivity of silver-plated SiO 2 nanofiber were studied.The results showed that the deposition of dopamine on the surface of SiO 2 nanofibers was beneficial to the subsequent silver plating process and helped form a silver nanoparticles layer with favorable morphology on the fiber surface;the resistivity of silver-plated SiO 2 nanofibers appeared a downward tendency with the increase of AgNO 3 concentration,and dropped to 0.1 mΩ·cm and then tended to be stable as the AgNO 3 concentration reached 10 g/L;at the same time,the fiber acquired a favorable conductivity because a uniform and dense silver nanoparticle layer formed on the fiber surface.