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FCC Superlattice Packing of Faceted Silver Nanocrystals

Published online by Cambridge University Press:  02 July 2020

S.A. Harfenist ,
Z.L. Wang ,
M.M. Alvarez ,
I. Vezmar  and
R.L. Whetten
S.A. Harfenist
Affiliation:
School of Physics, Georgia Institute of Technology, Atlanta, GA. 30332-0430
Z.L. Wang
Affiliation:
Schools of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA. 30332-0245
M.M. Alvarez
Affiliation:
School s of Physics, Chemistry, and Microelectronics Research Center, Georgia Institute of Technology, Atlanta, GA, 30332-0430
I. Vezmar
Affiliation:
School of Physics, Georgia Institute of Technology, Atlanta, GA. 30332-0430
R.L. Whetten
Affiliation:
School s of Physics, Chemistry, and Microelectronics Research Center, Georgia Institute of Technology, Atlanta, GA, 30332-0430
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Extract

The ordering of size selected nanocrystaline particles into large, well ordered supercrystals has been under recent study. Here we describe the ordering of silver nanocrystals, of core diameter ca. 4.5nm, passivated with alkythiolate self-assembled monolayers. The faceted nanocrystals are found to size selectively condense into ordered supercrystals with edge lengths on the order of 0.1 to 0.5 microns. Further, evidence has been found in High Resolution TEM micrographs of packed monolayers of these same nanocrystals implying an orientational ordering of the silver nanocrystals’ atomic lattices within and co-aligning with the supercrystal’s “superlattice”. A three dimensional model using a truncated octahedron for the nanocrystal core morphology is constructed from this evidence into an FCC superlattice which fits the remaining experimental observations.

Micrographs of the same region of a nanocrystal Ag supercrystal (NCASX) are shown in figure 1 under differing defocus conditions.

Type
Nanocrystals and Nanocomposites: Novel Structures For Catalysis, Electronics, and Micromechanics
Information
Microscopy and Microanalysis , Volume 3 , Issue S2: Proceedings: Microscopy & Microanalysis '97, Microscopy Society of America 55th Annual Meeting, Microbeam Analysis Society 31st Annual Meeting, Histochemical Society 48th Annual Meeting, Cleveland, Ohio, August 10-14, 1997 , August 1997 , pp. 403 - 404
Copyright
Copyright © Microscopy Society of America 1997

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References

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