Facile One-Pot Polyol Method for the Synthesis of Uniform Size Silver Nanowires

Abstract

This study reports the development of a facile and efficient one-pot polyol method for the synthesis of silver nanowires. The seed and growth of silver nanowires under different reaction conditions were characterized and measured. The pertinent variables such as temperature, time, concentration and capping agent were investigated. Moreover, the effect of seeding at two different stages-initial stage and secondary stage-was studied and discussed on the size control of silver nanowires. In particular, silver nanowires with diameter less than 40 nm and length over 25 µm in a narrow distribution, was obtained through a novel method in which reaction flask was placed in a low-temperature bath after seeding for some time in the high-temperature bath. This approach may be useful for the fabrication of uniform, large aspect ratio silver nanowires for optoelectronic applications.

Improved Polyol Syntheses of Silver Right Bipyramids and Nanorods: Camphorquinone-Mediated Morphology Control Methods

“…The formation of Ag NRs instead of longer Ag NWs may be due to the fact that the growth of Ag RBPs and the enlargement of diameters consumed more silver source, impeding the elongation of 1D Ag structures. Similar shortening mechanism was proved in other research on synthesizing Ag NRs . When more CQ was added, many byproducts of near-spherical silver particles were observed, as can be seen in Figure E, indicating that an overdose of CQ was unfavorable to the syntheses of Ag NRs and Ag RBPs.…”

“…It determines the diffusion coefficient, reduction kinetics, and also the reducibility of EG. In polyol synthesis, the length and diameter of Ag NWs are changed with temperature. ,, When CQ is added, the temperature also plays an important role in determining the morphology of products. SEM images of the obtained Ag nanostructures prepared at 100, 110, 120, and 150 °C and the corresponding yields of Ag NRs are shown in Figure .…”

“…Similar shortening mechanism was proved in other research on synthesizing Ag NRs. 37 When more CQ was added, many byproducts of near-spherical silver particles were observed, as can be seen in Figure 7E, indicating that an overdose of CQ was unfavorable to the syntheses of Ag NRs and Ag RBPs. Besides morphologies, the yields of both Ag NRs and Ag RBPs also changed a lot with the increased CQ/AgNO 3 molar ratios.…”

Polyol Silver Nanowire Synthesis and the Outlook for a Green Process

“…Kaili et al emphasized the importance of temperature in the range of 110-160°C as it determines the diffusion and reaction (nucleation and growth) rates. They showed that nanowire size decreases as the temperature increases due to increasing nucleation and growth [90]. Nghia et al used a microwave technique (800 W microwave oven equipped with a condenser) to synthesize AgNWs quickly with an irradiation time of 3.5 minutes and found that morphology depends strongly on the rate of heat [59].…”

“…Kaili et al showed that PVP as a capping agent not only plays an essential role in preventing seed agglomeration but also helps heterogeneous growth of MTPs to wire shape. They investigated the effect of PVP molecular weight (55,000, 360,000, and 13,000,000) on the diameter and length of synthesized AgNWs and showed that while PVPs with large MW provide better product quality, very large MW (13,000,000) PVP is not suitable for synthesis of AgNWs with a high aspect ratio without nanoparticles as byproducts due to the viscous effect of the polymers [90].…”