Double‐Lattice Packing of Pentagonal Gold Bipyramids in Supercrystals with Triclinic Symmetry

Abstract

low-symmetry triclinic structure is also useful for metamaterials applications and for fundamental studies of self-assembly processes.

Extracting the morphology of gold bipyramids from small-angle X-ray scattering experiments via form factor modelling

“…the position of the surface plasmon resonance) depends on shape features such as the truncation (Liu et al, 2007;Chateau et al, 2015;Marcheselli et al, 2020). The precise morphology of the NBPs influences their assembly in two (Shi et al, 2016;Fu et al, 2021) or three (Lyu et al, 2022) dimensions, which in turn further modulates their optical properties.…”

Tunable orientation of two-dimensional assembled Au octahedron superlattices in polymer films as flexible SERS substrates

“…17 3D superlattices comprising Au triangular nanoprisms and pentagonal Au bipyramids also exhibited orientation-dependent SERS activity. 18,19 Although the progress is notable, achieving a tunable orientation and the assembly of anisotropic nanoparticle 2D superlattices is still challenging because the balance of nanoscale forces during the assembly process is difficult to achieve. This challenge limits the availability of orientation-optimized nanostructures for in-depth study of their SERS effect and broad application.…”

Polymorphous Packing of Pentagonal Nanoprisms

“…For instance, we have recently obtained three-dimensional supercrystals (SCs) of truncated penta-twinned gold bipyramids that show a double-lattice packing related to the pentagonal ice-ray. 17 Penta-twinned anisotropic metallic nanoparticles have been assembled into standing monolayers on a substrate, 18,19 but so far only plastic crystals 20 have been reported. The discrepancy with the predictions above might be due to a large polydispersity in terms of size and shape or to their small width, which renders difficult the identification of the pentagonal cross section with a scanning electron microscope (SEM).…”

“…In this respect, metallic nanoparticles are excellent candidates due to their monodispersity, large size compared to molecules and high electron density. For instance, we have recently obtained three-dimensional supercrystals (SCs) of truncated penta-twinned gold bipyramids that show a double-lattice packing related to the pentagonal ice-ray . Penta-twinned anisotropic metallic nanoparticles have been assembled into standing monolayers on a substrate, , but so far only plastic crystals or an apparent hexagonal order have been reported.…”