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:22310673

Kim, J. W.; Dietze, S. H.; Ulvestad, A.; Fohtung, E.; Shpyrko, O. G. ^[1]; Manna, S.; Fullerton, E. E. ^[2]; Harder, R. ^[3]

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1. Department of Physics, University of California-San Diego, La Jolla, California 92093-0319 (United States)
2. Center for Magnetic Recording Research, University of California-San Diego, La Jolla, California 92093-0401 (United States)
3. Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 (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.

• OSTI ID: 22310673
• Journal Information: Applied Physics Letters, Vol. 105, Issue 17; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
AIR
CHEMICAL VAPOR DEPOSITION
COOLING
DISTRIBUTION
GOLD
INTERFACES
LAPLACE EQUATION
NANOPARTICLES
NANOSTRUCTURES
SILICON
STRAINS
SUBSTRATES
SURFACES
THERMAL EXPANSION
X RADIATION