Self-Assembly of Nanoparticle Superlattices

Self-assembly of nanoparticle superlattices harnesses the spontaneous organisation of discrete nanometre-scale particles into highly ordered, periodic structures. Driven by a balance of van der Waals forces, electrostatic interactions, ligand-mediated steric repulsion and entropic contributions, these processes yield two- and three-dimensional arrays whose emergent properties transcend those of individual building blocks. Control over particle shape, size monodispersity and surface chemistry allows tuning of lattice symmetry, interparticle spacing and defect density. Common assembly strategies include evaporation-induced deposition, liquid–liquid interfacial assembly and sedimentation, often coupled with external fields or templated substrates. The resulting superlattices exhibit collective optical, electronic, mechanical and catalytic functionalities, underpinning applications in photonic crystals, metasurfaces, sensor platforms and energy conversion devices. Advances in real-time characterisation and computational modelling now enable detailed mapping of growth pathways and defect evolution, paving the way to scalable fabrication of superlattice materials with bespoke features.

Research from Nature Portfolio

Recent studies have demonstrated the programmable formation of planar chiral superlattices from achiral, tetrahedral gold nanoparticles. By balancing electrostatic repulsion, van der Waals attraction and depletion forces at an air–liquid interface, researchers have mapped the selective emergence of hexagonal chiral phases and elucidated a nucleation pathway whereby individual tetrahedra rotate to generate long-range planar chirality. In parallel, exploration of polymer-grafted nanocrystals has revealed the formation of multiple binary superlattice phases through systematic variation of ligand molecular weight and core size. These polymer-brush interfaces introduce tunable softness into interparticle potentials, stabilising diverse two- and three-dimensional lattices across mesoscopic length scales. Foundational work on shape-dependent ordering of gold nanocrystals has further established that particle morphology critically influences domain size and lattice coherence. Combining experiment and simulation, this research highlights how sedimentation and controlled solvent evaporation of spheres, cubes, octahedra and dodecahedra yield millimetre-scale single-crystal superlattice films with defect densities determined by facet geometry.

Self-Assembly of Nanoparticle Superlattices publication trend

The graph below shows the total number of articles in self-assembly of nanoparticle superlattices across all publications each year (not limited to Nature Index journals).

Technical terms

Nanoparticle superlattice: A mesoscale crystal formed by periodic arrangement of nanoparticles into ordered lattices.

Ligand: A surface-bound molecule that modulates interparticle forces and stabilises colloidal dispersions.

Mesocrystal: An assembly of nanoparticles exhibiting common crystallographic orientation and coherent scattering behaviour.

Evaporation-induced assembly: A self-organisation technique in which solvent removal drives particles into ordered structures.

Planar chirality: Two-dimensional chiral symmetry emerging from asymmetric arrangements within a single layer of particles.

References

1. Metal Core–Shell Nanoparticle Supercrystals: From Photoactivation of Hydrogen Evolution to Photocorrosion. Advanced Materials (2023).
2. Structural diversity in binary superlattices self-assembled from polymer-grafted nanocrystals. Nature Communications (2015).
3. Shape-dependent ordering of gold nanocrystals into large-scale superlattices. Nature Communications (2017).
4. Assembly of planar chiral superlattices from achiral building blocks. Nature Communications (2022).
5. Temporal Evolution of Superlattice Contraction and Defect-Induced Strain Anisotropy in Mesocrystals during Nanocube Self-Assembly. ACS Nano (2020).