Effect of Different Mediated Agents on Morphology and Crystallinity of Synthesized Silver Nanowires Prepared by Polyol Process

Mohammad Taghi Satoungar,Hamed Azizi,Saeid Fattahi,Mohammad Khajeh Mehrizi,Hedieh Fallahi

doi:10.1155/2016/4354136

Mohammad Taghi Satoungar, Hamed Azizi + Show 3 more

Open Access

https://doi.org/10.1155/2016/4354136

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Abstract

Synthesis and characterization of multiple crystalline silver nanowires (NWs) with uniform diameters were carried out by using 1,2-propandiol and ethylene glycol (EG) as comediated solvents and FeCl3as mediated agent in the presence of poly(vinyl pyrrolidone) (PVP). Experimental data and structural characterizations revealed that AgNWs have evolved from the multiple crystalline seeds initially generated by reduction of AgNO3with EG and 1,2-propandiol followed by reducing Fe(III) to Fe(II) which in turn reacts with and removes adsorbed atomic oxygen from the surfaces of silver seeds. In addition, uniform silver nanowires were obtained by using FeCl2and AlCl3as mediated agents in EG solution. Field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) showed uniform nanowires in both diameter and length. UV-Vis spectra showed adsorption peaks confirming the formation of nanowires. X-ray diffraction (XRD) patterns displayed the final product with high crystallinity and purity. In this study, a growth mechanism for forming AgNWs was proposed and a comparison between different mediated agents was carried out.

Highlights

One-dimensional metal nanostructures have received significant attention in a wide range of applications; among them silver nanowires (AgNWs) are of great importance because of having high electrical and thermal conductivity in comparison with other metals [1,2,3,4,5]
Other researchers studied the effect of reaction time, temperature, and molecular weight of poly(vinyl pyrrolidone) (PVP) on the morphology of silver nanowires [14]
The resulting suspension was allowed to be cooled to room temperature, washed, and centrifuged by acetone and deionized water and the final product was kept in deionized water

Summary

Introduction

One-dimensional metal nanostructures have received significant attention in a wide range of applications; among them silver nanowires (AgNWs) are of great importance because of having high electrical and thermal conductivity in comparison with other metals [1,2,3,4,5]. Various methods have been utilized to synthesize silver nanowires, like solvothermal method [5], wet chemical synthesis [6], ambient solution phase [7], soft solution processing [8], polyol method [9], hydrothermal technique [2, 10], ultraviolet irradiation [11], synthesis with DNA, and so forth [12] Among these methods, polyol process is the most applicable due to its simplicity, low cost, high yield, and less reaction time. In other studies different chloride salts such as FeCl3 and CuCl2 have been used to synthesize AgNWs in polyol process [5, 17, 18] These chloride salts play the same role in controlling the growth of AgNWs through oxidative etching and stabilizing the reaction, the solubility and the nature of chloride salts influence the structural uniformity of silver nanowires. AgNWs can be used to produce antibacterial textiles for medical application [1,2,3,4,5,6,7]

Experimental

Synthesis Methods

Characterization of the Synthesized Silver Nanowires

Method C Method D

Method

Conclusion