Coalescence of Silver Nanoparticles at Room Temperature: Unusual Crystal Structure Transformation and Dendrite Formation Induced by Self-Assembly.

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It was found that during the evapn. of water from a droplet of a silver nanoparticles dispersion a self-assembly process leads to the coalescence of the nanoparticles at room temp. and eventually results in a 3D, micrometer-sized 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 fcc 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. [on SciFinder(R)]


CAPLUS AN 2009:97910(Journal)