skip to main content

SciTech ConnectSciTech Connect

Title: Curvature-induced and thermal strain in polyhedral gold nanocrystals

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.
Authors:
; ; ; ;  [1] ; ;  [2] ;  [3]
  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)
Publication Date:
OSTI Identifier:
22310673
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 17; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; AIR; CHEMICAL VAPOR DEPOSITION; COOLING; DISTRIBUTION; GOLD; INTERFACES; LAPLACE EQUATION; NANOPARTICLES; NANOSTRUCTURES; SILICON; STRAINS; SUBSTRATES; SURFACES; THERMAL EXPANSION; X RADIATION