High-pressure behavior of hydrophobically coated gold nanoparticle supercrystals: role of the structure

Balédent, V.; Goldmann, Claire; Ibrahim, Helen; Pansu, B.

doi:10.1039/d3sm00065f

Soft Matter

2023

DOI: 10.1039/d3sm00065f

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High-pressure behavior of hydrophobically coated gold nanoparticle supercrystals: role of the structure

V. Balédent

Claire Goldmann

Helen Ibrahim

et al.

Abstract: We report here an extensive high pressure small-angle X-ray scattering study on 3D supercrystals self-assembled from colloidal spherical gold crystalline nanoparticule (NPs). We used a large variety of NPs with...

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Elucidating Supercrystal Mechanics and Nanoparticle Size and Shape Effects under High Pressure

Hotton,

García‐Lojo,

Modin

et al. 2024

Small Structures

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Supercrystals, extended lattices of closely packed nanoparticles (NPs), present exciting possibilities for various applications. Under high pressures, typically in the gigapascal (GPa) range, supercrystals undergo significant structural changes, including adjustable interparticle distances, phase transformations, and the formation of new nanostructures through coalescence. While prior research has focused on ligand engineering's impact on supercrystal mechanical response, the influence of NP shape remains unexplored, especially for NPs larger than 10 nm coated with hydrosoluble ligands. This study examines the effects of NP shape on the mechanical properties of supercrystals using high‐pressure small‐angle X‐ray scattering and focused ion beam–scanning electron microscopy tomography. Notably, supercrystals exhibit higher hardness levels compared to previously reported values for gold supercrystals, attributed to the use of larger NPs. Spherical and tetrahedral NPs rearrange before collapsing under pressure, whereas rods and octahedra coalesce without prior structural rearrangement, likely due to their higher packing fraction. Additionally, anisotropic deformation of NP lattices and sintering does not always correlate with deviatoric stresses. These findings refine the understanding of complex processes governing supercrystal structure under high pressure, opening new avenues for NP engineering and advancing plasmonic applications under extreme conditions.

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Elucidating Supercrystal Mechanics and Nanoparticle Size and Shape Effects under High Pressure

Hotton,

García‐Lojo,

Modin

et al. 2024

Small Structures

View full text Add to dashboard Cite

show abstract

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High-pressure behavior of hydrophobically coated gold nanoparticle supercrystals: role of the structure

Abstract: We report here an extensive high pressure small-angle X-ray scattering study on 3D supercrystals self-assembled from colloidal spherical gold crystalline nanoparticule (NPs). We used a large variety of NPs with...

Cited by 1 publication

References 42 publications

Elucidating Supercrystal Mechanics and Nanoparticle Size and Shape Effects under High Pressure

Elucidating Supercrystal Mechanics and Nanoparticle Size and Shape Effects under High Pressure

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