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Published in

American Institute of Physics, Applied Physics Letters, 17(105), p. 173108

DOI: 10.1063/1.4900866

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Curvature-induced and thermal strain in polyhedral gold nanocrystals

This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We use coherent x-ray diffractive imaging to map the local distribution of strain in gold (Au) polyhedral nanocrystals grown on a silicon (Si) substrate by a single-step thermal chemical vapor deposition process. The lattice strain at the surface of the octahedral nanocrystal agrees well with the predictions of the Young-Laplace equation quantitatively, but exhibits a discrepancy near the nanocrystal-substrate interface. We attribute this discrepancy to the dissimilar interfacial energies between Au/Air and Au/Si and to the difference in thermal expansion between the nanocrystal and the substrate during the cooling process. (C) 2014 AIP Publishing LLC.