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(A,B) The typical HRTEM photographs of the as-prepared β-NaYF4: Yb3+, Er3+ upconversion nanocrystals; (C,D) The typical HRTEM photographs of the UCNPs@SiO2 nanocrystals; (E,F) The typical SEM images of the obtained UCNPs@SiO2@MIP polymeric materials. The scale bars represent 50 nm (A–D) and 2 μm (E,F), respectively; The size distribution of UCNPs (G), UCNPs@SiO2 (H), MIPs (I), and NIPs (J) obtained via Dynamic Light Scattering (DLS).
