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 Communjournal_title
Nature communicationsauthors
Jensen KM,Juhas P,Tofanelli MA,Heinecke CL,Vaughan G,Ackerson CJ,Billinge SJdoi
10.1038/ncomms11859subject
Has Abstractpub_date
2016-06-14 00:00:00pages
11859issn
2041-1723pii
ncomms11859journal_volume
7pub_type
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