Curvature-induced and thermal strain in polyhedral gold nanocrystals

Journal Article · Mon Oct 27 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4900866· OSTI ID:1249209

Kim, J. W. ^[1]; Manna, S. ^[1]; Dietze, S. H. ^[1]; Ulvestad, A. ^[1]; Harder, R. ^[2]; Fohtung, E. ^[1]; Fullerton, E. E. ^[1]; Shpyrko, O. G. ^[1]

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1. Univ. of California, San Diego, CA (United States)
2. Argonne National Lab. (ANL), Argonne, IL (United States)

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.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1249209
• Journal Information: Applied Physics Letters, Vol. 105, Issue 17; ISSN 0003-6951
• Publisher: American Institute of Physics (AIP)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE