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Cryo-transmission electron microscopy of Ag nanoparticles grown on an ionic liquid substrate

Published online by Cambridge University Press:  31 January 2011

Dalaver H. Anjum ,
Rebecca M. Stiger ,
James J. Finley  and
James F. Conway
Dalaver H. Anjum*
Affiliation:
Department of Structural Biology, University of Pittsburgh–School of Medicine, Pittsburgh, Pennsylvania 15260
James J. Finley
Affiliation:
PPG Glass Business and Discovery Center, Cheswick, Pennsylvania 15024
James F. Conway*
Affiliation:
Department of Structural Biology, University of Pittsburgh–School of Medicine, Pittsburgh, Pennsylvania 15260
*
a)Present address: Imaging & Characterization Facility, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia.
b)Address all correspondence to this author. e-mail: jxc100@pitt.edu
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Abstract

We report a novel method of growing silver nanostructures by cathodic sputtering onto an ionic liquid (IL) and our visualization by transmission cryo-electron microscopy to avoid beam-induced motion of the nanoparticles. By freezing the IL suspension and controlling electron dose, we can assess properties of particle size, morphology, crystallinity, and aggregation in situ and at high detail. We observed round silver nanoparticles with a well-defined diameter of 7.0 ± 1.5 nm that are faceted with crystalline cubic structures and ˜80% of the particles have multiply twinned faults. We also applied cryo-electron tomography to investigate the structure of the nanoparticles and to directly visualize the IL wetting around them. In addition to particles, we observed nanorods that appear to have assembled from individual nanoparticles. Reexamination of the samples after 4–5 days from initial preparation showed significant changes in morphology, and potential mechanisms for this are discussed.

Keywords

Transmission electron microscopy (TEM)AgNanostructure
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 7 , July 2010 , pp. 1264 - 1271
Copyright
Copyright © Materials Research Society 2010

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