• • Moderate-concavity nanodumbbells with d/D ratios between 0.55 and 0.65 yield high-quality Kagome lattices with p6 symmetry over large areas, enabling scalable production of chiral metamaterials with potential applications in nonlinear optics and topological photonics.
• • Depletion interactions, tuned via free oleic acid concentration, overcome steric hindrance and kinetic traps inherent to nonconvex geometries, reducing disordered aggregates and promoting long-range order—critical for industrial-scale assembly of functional superlattices.
• • The curvature-guided depletion mechanism achieves selective attraction between concave waists and convex heads, enabling programmable binding motifs (parallel, herringbone, chevron, bi-chevron) with a high degree of directional control, essential for designing reconfigurable electronic and mechanical metamaterials.
• • Planar chirality in the assembled Kagome lattices, with distinct clockwise and counterclockwise domains, offers a route to chiral optical devices and enantioselective catalysis, where the d/D ratio serves as a tunable parameter for chirality control.