SYNTHESIZE AND INVESTIGATE THE EFFECT OF TEMPERATURE ON THE ABSORPTION SPECTRUM OF SILVER NANOWIRES BY POLYOL METHOD

Abstract

In this work, we synthesize and investigate the influence of temperature on the formation of silver nanowires using the polyol method. Silver nanowires uniform in shape and size were synthesized using Polyvinylpyrrolidone (PVP- 400,000 MW) and fresh synthesised silver chloride (AgCl). The precursor for the synthesis is silver nitrate in ethylene glycol (EG) medium. The reaction process was optimized by adjusting the reaction temperature from 140°C to 170°C through UV-VIS plasmon absorption spectroscopy, SEM transmission electron microscopy images, and ray diffraction XRD. The results show that the formation and growth of silver nanowires depends on the reaction temperature. When the temperature is below 150°C, the synthesis efficiency of silver nanowires is low. In the product, there exist other silver structures such as silver nanorods, silver nanostructures cuber and some other structures. When the synthesis temperature is 160°C - 170°C, silver nanowires are formed that are uniform in shape and size, and the efficiency of synthesizing silver nanowires is highest. Silver nanowires have aspect ratio over 100 with a diameter of about 20 nm, and length over 2mm.