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Silver Nanocube and Nanobar Growth via Anisotropic Monomer Addition and Particle Attachment Processes

Understanding the growth mechanism of noble metal nanocrystals during solution synthesis is of significant importance for shape and property control. However, much remains unknown about the growth pathways of metal nanoparticles due to the lack of direct observation. Using an in situ transmission electron microscopy technique, we directly observed Ag nanocube and nanobar growth in an aqueous solution through both classical monomer-by-monomer addition and nonclassical particle attachment processes. During the particle attachment process, Ag nanocubes and nanobars were formed via both oriented and nonoriented attachment. Our calculations, along with the dynamics of the observed attachment, showed that the van der Waals force overcomes hydrodynamic and friction forces and drives the particles toward each other at separations of 10–100 nm in our experiments. During classical growth, anisotropic growth was also revealed, and the resulting unsymmetrical shape constituted an intermediate state for Ag nanocube gr...

Authors:   Dongdong Xiao; Zhigang Wu; Miao Song; Jaehun Chun; Gregory K. Schenter; Dongsheng Li
Journal:   Langmuir
Year:   2018
DOI:   10.1021/acs.langmuir.7b02870
Publication date:   19-Jan-2018
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