Fig. 2: General applicability of the dual-ligand assistant strategy for synthesizing functional COF nanocomposites. | Nature Communications

Fig. 2: General applicability of the dual-ligand assistant strategy for synthesizing functional COF nanocomposites.

From: Imparting multi-functionality to covalent organic framework nanoparticles by the dual-ligand assistant encapsulation strategy

Fig. 2

TEM images of COF-coated (a) mesoporous SiO2 (mSiO2), (b) Upconverting nanoparticles@SiO2 (UCNPs@SiO2), and (c) Fe2O3 ellipsoids. d TEM image of COF nanobowls obtained from SiO2@COF after etching SiO2 core. Inset is the SEM image of the obtained bowl-shaped COF. e TEM image of yolk-shell UCNP@COF obtained from UCNP@SiO2@COF after etching the SiO2 interlayer. f TEM image of core@satallite@shell structured Zr-MOF@DCNPs@COF. Scale bars are all 200 nm. g Hysteresis loops of the Fe3O4 and Fe3O4@COF nanocomposites. Inset represents the photos of Fe3O4@COF aqueous dispersion before and after separated by external magnetic field. h UV–vis spectra of CuS nanoplates and CuS@COF aqueous dispersions. Inset indicates the thermal images of CuS@COF dispersion after irradiated by 808 nm NIR laser (0.5 W/cm2) for different time. i Downconversion luminescent spectra of Zr-MOF@DCNPs and Zr-MOF@DCNPs@COF dispersions. Inset represents the NIR II emission intensity of Zr-MOF@DCNPs@COF dispersions with different concentrations upon excited by 808 nm NIR laser and the corresponding NIR II images (concentration increases from left to right). A representative image of three replicates from each group is shown.

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