Coalescence of Silver Nanoparticles at Room Temperature: Unusual Crystal Structure Transformation and Dendrite Formation Induced by Self-Assembly
Coalescence of Silver Nanoparticles at Room Temperature: Unusual Crystal Structure Transformation and Dendrite Formation Induced by Self-Assembly
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DOI：
10.1021/la803843k
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发表时间：
2009-02-17
期刊：
影响因子：
3.9
通讯作者：
Kamyshny, Alexander
中科院分区：
文献类型：
--
作者：
Grouchko, Michael;Popov, Inna;Kamyshny, Alexander
发现在水从银纳米颗粒分散体的液滴蒸发期间，自组装过程导致纳米颗粒在室温下聚结，并最终导致3D微米级枝晶。对单个纳米颗粒的聚结事件的直接原位HR-TEM观察显示，在此过程中发生纳米颗粒的晶体结构的转变，从常见的fee银结构转变为不寻常的hcp结构。结果发现，即使分散体中的大多数纳米颗粒具有fcc结构，但所获得的树枝状晶体的特征在于hcp结构，反映了由于聚结过程而导致的晶体结构转变。
It was found that during the evaporation of water from a droplet of a silver nanoparticles dispersion a self-assembly process leads to the coalescence of the nanoparticles at room temperature and eventually results in a 3D, micrometersized dendrite. Direct in situ HR-TEM observation of coalescence events of individual nanoparticles revealed that during this process a transformation of the nanoparticles' crystal structure takes place, from the common fee silver structure to the unusual hcp structure. It was found that even-though a majority of the nanoparticles in the dispersion have the fcc structure the obtained dendrites are characterized by the hcp structure, reflecting the crystal structure transformation due to the coalescence process.