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Studies of Hexagonal Pt and Au Nanocluster Superlattices

Published online by Cambridge University Press:  02 July 2020

P. Newcomer Provencio ,
J. E. Martin ,
J. G. Odinek  and
J. P. Wilcoxon
P. Newcomer Provencio
Affiliation:
Sandia National Lab., P.O. Box 5800, MS 1421, Albuquerque, NM87185
J. E. Martin
Affiliation:
Sandia National Lab., P.O. Box 5800, MS 1421, Albuquerque, NM87185
J. G. Odinek
Affiliation:
Sandia National Lab., P.O. Box 5800, MS 1421, Albuquerque, NM87185
J. P. Wilcoxon
Affiliation:
Sandia National Lab., P.O. Box 5800, MS 1421, Albuquerque, NM87185
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Extract

We have recently synthesized superlattices of Pt and Au nanoclusters grown by inverse micelle techniques. The monodisperse nanosize metal clusters used in this study were synthesized as surfactant aggregates surrounded by an oil-like environment (inverse micelle), a technique developed and patented at Sandia. Reaction byproducts, such as excess surfactant and inorganic ion salts, are often separated from the metal clusters using liquid chromatography size exclusion techniques; however, the Pt and Au nanoclusters in this study have been fractionated using a liquid-liquid technique. The nanoclusters are capped with a ligand.

Two-dimensional hexagonal arrays formed readily on surfaces, and large twinned three-dimensional crystals form from solution. Both the cluster size and the size of the capping ligand can be controlled to form superlattices having a range of lattice parameters. We have found that the capping agent exerts a marked influence on the tendency of these clusters to order.

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. 734 - 735
Copyright
Copyright © Microscopy Society of America

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References

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