Fig. 5. Mechanical properties of the silicated FCC DNA-NP superlattice under compression stress.

SAXS patterns of the coated superlattice composed of DNA origami tetrahedra and 15-nm gold NPs under high hydrostatic pressure generated using Almax plate diamond anvil cell. (A) Scattering data of the sample containing 20% silica by volume compressed to different pressures up to 8.00 GPa and (B) completely filled with silica. The vertical dashed line is used to guide the eye to track the 111-peak shift under increasing pressure. (C) Evolution of the unit cell volume of the superlattice as a function of pressure, coated by a varied amount of SiO₂. Green markers, 20% silica; red markers, 100% interstitial volume filled by silica. The solid lines indicate fitting results to the second-order Birch-Murnaghan equation of state and the calculated bulk moduli (B₀) of the superlattice coated to a different thickness of silica (see the Supplementary Materials).