Synthesis and Characterizing of High Aspect Ratio Silver Nanowires by Polyol Process

Silver nanowires with controllable and high length-diameter ratio were prepared by using the reductibility of ethylene glycol under high temperature and selective adsorption of PVP. AgNO 3 , ethylene glycol, PVP and CuCl 2 was used as the silver source, the reductant, the capping agent and the ion additives, respectively. The effects of centrifugal rate, silver ions' concentration, AgNO 3 adding rate on the morphology of silver nanowires were investigated by SEM, XRD, TEM and other technologies. The results show that the optimal centrifugal rate is 2000n/s, the better silver ions’ concentration is 6.55 mg/mL, and the best rate of adding AgNO 3 is 6 ml/min. The silver nanowires with an average diameter of 74.9 nm, the average length of 45.5μm and its length-diameter ratio of 607.5 are obtained. The silver nanowires with good morphology and high length-diameter ratio are adjustable, which is suitable for the preparation of OLED transparent film electrode materials, and other conductive materials.