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A BCC Superlattice of Passivated Gold Nanocrystals

Published online by Cambridge University Press:  02 July 2020

S.A. Harfenist ,
Z.L. Wang ,
T.G. Schaaff  and
R.L. Whettent
S.A. Harfenist
Affiliation:
School of Physics, Georgia Institute of Technology, Atlanta, Atlanta, Ga. 30332-0430
Z.L. Wang
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Ga. 30332
T.G. Schaaff
Affiliation:
School of Chemistry, Georgia Institute of Technology, Atlanta, Ga. 30332
R.L. Whettent
Affiliation:
Schools of Physics, Chemistry and Microelectronics Research Center, Georgia Institute of Technology, Atlanta, Ga. 30332-0430
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Extract

A recent development in the study of nanocrystalline materials has been the self-assembly of passivated nanometer scale building blocks into larger, well ordered structures reaching the micron scale. Nanocrystal supercrystals (NCS) have been observed in metallic, semiconductor, and magnetic materials. In most cases the nanocrystals (NXs) are encapsulated in some inert medium that effectively protects the nanocrystal core and its unique electronic and optical properties. Here we describe the self-assembly of gold nanocrystals (∼4.5 nm core diameter), passivated with hexanethiol self-assembled-monolayers into ordered regions exhibiting a body-centered-cubic (bcc) superstructure. Transmission Electron Microscopy (TEM) imaging and Electron Diffraction (ED) experiments were used to characterize the NCSs and their resulting superstructures.

A large agglomeration of NCSs can be seen in figure 1. One can clearly see regions of periodicity within the nanocrystal aggregation.

Type
Nanophase and Amorphous Materials
Information
Microscopy and Microanalysis , Volume 4 , Issue S2: Proceedings: Microscopy & Microanalysis '98, Microscopy Society of America 56th Annual Meeting, Microbeam Analysis Society 32nd Annual Meeting, Atlanta, Georgia July 12-16, 1998 , July 1998 , pp. 716 - 717
Copyright
Copyright © Microscopy Society of America

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