Polyhedral gold nanocrystals with Oh symmetry: From octahedra to cubes

Daeha Seo, Chan Park Ji, Hyunjoon Song

Research output: Contribution to journalArticlepeer-review

398 Scopus citations

Abstract

We report the shape and size control of polyhedral gold nanocrystals by a modified polyol process. The rapid reduction of gold precursors in refluxing 1,5-pentanediol has successfully provided a series of gold nanocrystals in the shape of octahedra, truncated octahedra, cuboctahedra, cubes, and higher polygons by incremental changes of silver nitrate concentration. All nanocrystals were obtained quantitatively and were uniform in shape and size in the range of ∼100 nm. Smaller octahedra and cubes were also prepared by using large amounts of PVP. Silver species generated from AgNO3 seemed to determine the final nanocrystal morphology by the selective growth of {111} and/or the restriction of {100}. The shape evolution of the particles was addressed by quenching the reactions at different time intervals. The ∼60 nm seeds were generated rapidly and grown slowly with simultaneous edge sharpening. Aging the reaction mixture focused the size and shape of the nanocrystals by Ostwald ripening. We believe that our selective growth conditions can be applied to other shapes and compositions of face-centered cubic metals.

Original languageEnglish
Pages (from-to)14863-14870
Number of pages8
JournalJournal of the American Chemical Society
Volume128
Issue number46
DOIs
StatePublished - 22 Nov 2006

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