Fig. 3: Colloidal crystal engineering with MOF PAEs.

a–c 2D SAXS and radially averaged 1D SAXS patterns (in logarithmic scale) for superlattices formed from a 37 nm UiO-66 NPs in an fcc arrangement assembled with self-complementary DNA and b binary 37 nm UiO-66 NPs in a bcc arrangement assembled with complementary DNA. Experimental data are shown in red, and simulated scattering patterns are shown in gray. d–f 2D SAXS and radially averaged 1D SAXS patterns (in logarithmic scale) for CsCl lattices formed from complementary DNA functionalized d 37 nm UiO-66 NPs and 20 nm AuNPs (1:1 ratio) and e 37 nm UiO-66 NPs and 40 nm AuNPs (1:1 ratio). AB₂ impurity phase is indicated by blue asterisks. g SAXS data of UiO-66 NPs of different uniformity prepared by sucrose-gradient ultracentrifugation: red, 34 ± 4 nm (CV = 11%); blue, 39 ± 6 nm (CV = 15%); green, 47 ± 11 nm (CV = 23%). h In situ SAXS monitoring the thermally induced transition of MOF–Au PAE aggregates from the amorphous to crystalline state. i Secondary electron STEM image of a single crystalline UiO-66 NP and 40 nm AuNP hybrid superlattices with j rhombic dodecahedra crystal habits, and transmission electron image of k an 80-nm-thick sample cross-section prepared by ultramicrotomy. All scale bars are 200 nm.