Polymorphism in magic-sized Au144(SR)60 clusters.

Abstract:

:Ultra-small, magic-sized metal nanoclusters represent an important new class of materials with properties between molecules and particles. However, their small size challenges the conventional methods for structure characterization. Here we present the structure of ultra-stable Au144(SR)60 magic-sized nanoclusters obtained from atomic pair distribution function analysis of X-ray powder diffraction data. The study reveals structural polymorphism in these archetypal nanoclusters. In addition to confirming the theoretically predicted icosahedral-cored cluster, we also find samples with a truncated decahedral core structure, with some samples exhibiting a coexistence of both cluster structures. Although the clusters are monodisperse in size, structural diversity is apparent. The discovery of polymorphism may open up a new dimension in nanoscale engineering.

journal_name

Nat Commun

journal_title

Nature communications

authors

Jensen KM,Juhas P,Tofanelli MA,Heinecke CL,Vaughan G,Ackerson CJ,Billinge SJ

doi

10.1038/ncomms11859

subject

Has Abstract

pub_date

2016-06-14 00:00:00

pages

11859

issn

2041-1723

pii

ncomms11859

journal_volume

7

pub_type

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