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首页> 外文期刊>Key Engineering Materials >Synthesis and Growth Mechanisms of Ag Metallo-organic Nanoparticles in Different Morphologies by using Polymer-mediated Polyol Process
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Synthesis and Growth Mechanisms of Ag Metallo-organic Nanoparticles in Different Morphologies by using Polymer-mediated Polyol Process

机译：高分子介导的多元醇法合成不同形态的Ag金属有机纳米粒子及其生长机理

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摘要

Mono-dispersed silver nanoparticles with various morphologies were synthesized in large quantities by reducing silver nitrate with ethylene glycol in the presence of poly(vinylpyrrolidone) (PVP). The effects of the concentration of AgNO_3, temperature, adding rates of PVP and AgNO_3 injected into ethylene glycol as well as molar ratio between the repeating unit of PVP and AgNO_3 were discussed. By varying the temperature and reaction time, silver nanocubes, nanoprisms and nanospheres were obtained. It is indicated that at elevated temperatures, the ethylene glycol can reduce Ag~+ ion into Ag atoms, and thereby inducing the nucleation and growth of silver nanostructures in the solution phase. In the polymer-mediated polyol process, PVP plays a critical role in producing silver nanostructures with good stability and size/shape uniformity. As a result, both the crystallinity of a seed and extent of PVP coverage on the seed were instrumental in controlling the morphology of Ag nanoparticles.
机译：通过在聚（乙烯基吡咯烷酮）（PVP）存在下用乙二醇还原硝酸银，大量合成了各种形态的单分散银纳米颗粒。讨论了AgNO_3的浓度，温度，PVP和AgNO_3注入乙二醇的比例以及PVP和AgNO_3的重复单元之间的摩尔比的影响。通过改变温度和反应时间，获得了银纳米立方体，纳米棱镜和纳米球。结果表明，在较高的温度下，乙二醇可以将Ag〜+离子还原为Ag原子，从而在溶液相中诱导银纳米结构的形核和生长。在聚合物介导的多元醇工艺中，PVP在生产具有良好稳定性和尺寸/形状均匀性的银纳米结构中起着至关重要的作用。结果，种子的结晶度和种子上PVP覆盖的程度均有助于控制Ag纳米颗粒的形态。

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