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Observation of Coalescence Process of Silver Nanospheres During Shape Transformation to Nanoprisms

Pyng Yu*, Jane Huang and Jau Tang*

Author affiliations

Research Center for Applied Sciences, Academia Sinica, Taipei, Taiwan

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Citation and License

Nanoscale Res Lett 2011, 6:46  doi:10.1007/s11671-010-9808-6

Published: 28 September 2010

Abstract

In this report, we observed the growth mechanism and the shape transformation from spherical nanoparticles (diameter ~6 nm) to triangular nanoprisms (bisector length ~100 nm). We used a simple direct chemical reduction method and provided evidences for the growth of silver nanoprisms via a coalescence process. Unlike previous reports, our method does not rely upon light, heat, or strong oxidant for the shape transformation. This transformation could be launched by fine-tuning the pH value of the silver colloidal solution. Based on our extensive examination using transmission electron microscopy, we propose a non-point initiated growth mechanism, which is a combination of coalescence and dissolution–recrystallization process during the growth of silver nanoprisms.

Keywords:
Silver nanoprisms; Self-assembly; Cluster fusion; Coalescence; Recrystallization