Interactive effect of agitation rate and oxidative etching on growth mechanisms of silver nanowires during polyol process

Abstract

In this work, the interaction between agitation rate and oxidative etching on the growth mechanisms of silver nanowires during polyol process, the most conventional applied method for metallic nanoparticles synthesis, is evaluated. It was found that the main reason for the formation of multidiameter nanowires (MDNWs) is the local accumulation of silver ions in the system, i.e. even at a low concentration of silver ions (94 mM) under the mild agitation conditions, MDNWs were producible. Moreover, it was inferred that the more stress (stemming from the high agitation) applied on the initially formed decahedron Ag particles affects the 're-entrant grooves opening' process which results in the formation and growth of irregular nanostructures. A polynomial equation for tuning aspect ratio of silver nanowires using different concentration of CuCl 2 solution was also proposed. Finally, based on the obtained experimental data together with the thermodynamic considerations, a growth mechanism was proposed which can promisingly be employed for describing the one-dimensional growth of silver nanowires in both surfactant-modified and surfactant-free procedures.

A Self-Assembly of Single Layer of Co Nanorods to Reveal the Magnetostatic Interaction Mechanism

“…This demonstrates that the mechanical stirring can interrupt the growth of nanorods from the length direction; this can be explained by the fact that the growth of long Co nanorods requires Co 2+ continuously feeding. With the increase of stirring rate, homogenizing the solution can hinder local increment of Co 2+ concentration in the solution [ 31 , 32 ]. As a result, the growth of Co nanorods from the length direction was interrupted, forming multiple shorter nanorods.…”

Shape Dependence of Silver Nanowires on Synthesis Conditions and it’s Effect on the Optical and Electrical Properties

“…PVP used for the polyol process plays a vital role in AgNW growth. It acts as the capping agent and favors attaching to the side surfaces of silver multiply twinned particles (MTPs), which is a structure necessary for controlling shape transformation in the nanowire structure synthesis process [6,7]. Meanwhile, AgNW growth can also be enhanced by this strong chemical absorption, in which PVP can promote a linear alignment of Ag atoms, and more particles could naturally contribute to AgNW growth [8].…”

Solid-state growth of Ag nanowires and analysis of the self-growing process on a bio-polymer chitosan film

“…[27][28][29][30][31] Among these reports, our published work demonstrates a facile green method to synthesize Ag NPs on chitosan film, which eventually grow in the solid-state synthesis of AgNWs. 13,14 In previously described AgNW synthetic processes, the growth mechanism for AgNWs in solution relies on several influencing factors including oxidative etching, 32,33 concentration of Cl − ions, 34 thermodynamics, specifically the temperature at which the synthesis reaction is performed, 35,36 and the kinetics of the reaction system, specifically the time and intensity of mechanical agitation. 10 Herein we report the growth mechanism of AgNWs via a bottom up synthetic method for the generation of AgNWs on a chitosan bio-polymer film.…”