Electrochemical Cycling of Polycrystalline Silver Nanoparticles Produces Single-Crystal Silver Nanocrystals,Langmuir

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Electrochemical Cycling of Polycrystalline Silver Nanoparticles Produces Single-Crystal Silver Nanocrystals
Langmuir ( IF 3.7 ) Pub Date : 2017-11-13 00:00:00 , DOI: 10.1021/acs.langmuir.7b03156
Poonam Singh ₁ , Ray W. Carpenter ₁ , Daniel A. Buttry ₁

Affiliation

Electrochemically driven phase transformations in redox-active nanoparticles (NPs) are important in a number of areas, including batteries and sensors. We use high-resolution electron microscopy in conjunction with ex situ electrochemical experiments on TEM grids to study the oxidative conversion of polycrystalline silver NPs to amorphous silver oxide nanoparticles and their reductive conversion back to single-crystal silver nanocrystals (NCs). Results show that during oxidation nucleation occurs uniformly at the NP surface, producing a Ag@Ag₂O core@shell structure during growth. The images reveal polycrystalline Ag cores and amorphous Ag₂O shells for these structures. Electron microscopy also showed that the electrochemical reduction of Ag₂O NPs can produce single-crystal Ag nanocrystals, suggesting that point nucleation at the NP–electrode interface during reduction enables a growth mechanism favoring the formation of single-crystal nanoparticles.

中文翻译：

多晶银纳米粒子的电化学循环产生单晶体银纳米晶体。

氧化还原活性纳米颗粒（NPs）中电化学驱动的相变在许多领域都很重要，包括电池和传感器。我们将高分辨电子显微镜与TEM网格上的非原位电化学实验结合使用，研究了多晶银NPs氧化转化为无定形氧化银纳米颗粒并将其还原转化为单晶银纳米晶体（NCs）。结果表明，在氧化过程中，NP表面均匀地发生了成核作用，并在生长过程中产生了Ag @ Ag ₂ O核壳结构。图像显示了这些结构的多晶Ag核和无定形Ag ₂ O壳。电子显微镜还表明，Ag ₂的电化学还原O NPs可以产生单晶Ag纳米晶体，这表明还原过程中NP-电极界面的点成核可以促进形成单晶纳米颗粒的生长机制。

更新日期：2017-11-14

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