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Dendritic silver nanostructure growth and evolution in replacement reaction

机译:树枝状银纳米结构在置换反应中的生长和演化

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摘要

In this study, a well-defined dendritic silver nanostructure can be large-scale synthesized in AgNO3 (aqueous) at room temperature. The nonequilibrium and anisotropic growth at different silver ion concentrations result in controllable morphologies and morphological evolution. At high silver ion concentrations, a strong anisotropic growth contributes to a fine single crystalline silver dendrite. As the reaction proceeds, the dendritic structure transforms into a thermodynamically stable hexagonal structure. At a relatively low silver ion concentration, a particle-aggregated fractal pattern can be obtained due to relatively small anisotropy. As the reaction time increases, the transition from polycrystalline aggregates to a single crystal during silver dendritic growth can be observed. An oriented attachment mechanism can be used to explain the structural and morphological evolution of silver nanostructures. Silver nanostructures with various morphologies are expected to have significant potential applications in superhydrophobic surfaces, surface-enhanced Raman scattering, and others.
机译:在这项研究中,可以在室温下在AgNO3(水溶液)中大规模合成定义明确的树枝状银纳米结构。在不同银离子浓度下的非平衡和各向异性生长导致可控的形态和形态演化。在高银离子浓度下,强烈的各向异性生长有助于形成细小的单晶银枝晶。随着反应的进行,树枝状结构转变成热力学稳定的六边形结构。在相对较低的银离子浓度下,由于相对较小的各向异性,可以获得颗粒聚集的分形图案。随着反应时间的增加,可以观察到在银树枝状生长期间从多晶聚集体到单晶的转变。定向的附着机制可以用来解释银纳米结构的结构和形态演变。预期具有各种形态的银纳米结构在超疏水表面,表面增强拉曼散射等方面具有重要的潜在应用。

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