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Article Dans Une Revue Journal of Applied Crystallography Année : 2023

Extracting the morphology of gold bipyramids from SAXS experiments via form factor modeling

Jieli Lyu
Cyrille Hamon
Doru Constantin

Résumé

Accurate shape description is a challenge in material science. Small-angle X-ray scattering (SAXS) can provide the shape, size and polydispersity of nanoparticles by form factor modeling. However, simple geometrical models such as the ellipsoid may not be enough to describe objects with complex shapes. In this work we show that the form factor of gold nanobipyramids is accurately described by a truncated bicone model, which is validated by comparison with transmission electron microscopy (TEM) data for nine different synthesis batches: we obtain the average shape parameters (width, height, and truncation) and the sample polydispersity. In contrast, the ellipsoid model yields worse fits of the SAXS data and exhibits systematic discrepancies with the TEM results.

Domaines

Matériaux
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Dates et versions

hal-03956176 , version 1 (25-01-2023)

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Citer

Jieli Lyu, Claire Goldmann, Cyrille Hamon, Doru Constantin. Extracting the morphology of gold bipyramids from SAXS experiments via form factor modeling. Journal of Applied Crystallography, 2023, 56 (1), pp.214-221. ⟨10.1107/S1600576722011669⟩. ⟨hal-03956176⟩
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