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Characterization of UCNP nanocages. (A) Scanning electron microscopy image of UCNP (NaluF4:Yb, Tm) nanoparticles. (B) Transmission electron microcopy of UCNP-siRNA-PAA-AS1411 nanoparticles. (C) X-ray diffraction of NaluF4:Yb, Tm nanoparticles. (D) Fourier transform infrared spectrophotometry of UCNP, UCNP-siRNA, and UCNP-siRNA-PAA-AS1411 using ethanol as a solvent.
