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Figure 5
CXS of the {111} Bragg ring simulated for single- and multi-domain NP models. (a) The simulated CXS for a non-twinned cuboctahedron gold NP atomic model (section S2 in the supporting information). Note that, for single-domain gold particles, one would only expect a CXS signal at cosψ = [\pm {1\over 3}], corresponding to the {111} interplanar angles of an f.c.c. crystal. We observed this CXS signal from the large domains in our sample. (b) The simulated CXS for a nearest-neighbor tetrahedron (NNT, outlined in dashed blue). Multi-twinned particles, such as the decahedron shown here, are composed of several NNT units. The angular gap in the decahedron results because the tetrahedra are each close-packed f.c.c. domains (Yang, 1979BB50). The twinning gives rise to additional CXS peaks. We observed this signal from the small twinned NP domains.

Volume 3| Part 6| November 2016| Pages 420-429
ISSN: 2052-2525