Fig. 3. Specific recognition reaction.
a1 Schematic illustration of DNA-directed assembly of UCNPs and AuNPs. TEM images of the assembly of T30-UCNPs with AuNPs containing complementary DNA (a2) and non-complementary DNA (a3)32. b1 Schematic illustrations of the DNA-mediated assemblies of UCNPs and AuNPs (5 nm). b2 TEM images of DNA-mediated assemblies UCNPs (NaYF4:Yb/Er nanospheres and NaYF4:Gd/Yb/Er nanorods) with AuNPs33. c1 Nanopyramids for dual miRs detection. c2 Luminescence spectra of Ag2S NPs, Au-Cu9S5 NPs, UCNPs, pyramids, pyramids with miR-21, and pyramids with miR-203b excited by 808 nm laser34. a1–a3 Reprinted with permission from ref. 32 Copyright 2013, American Chemical Society. b1, b2 Reprinted with permission from ref. 33 Copyright 2020, John Wiley and Sons. c1, c2 Reprinted with permission from ref. 34 Copyright 2017, John Wiley and Sons