Fig. 2From: Facile Fabrication of BiF3: Ln (Ln = Gd, Yb, Er)@PVP Nanoparticles for High-Efficiency Computed Tomography ImagingFTIR spectra of BiF3: Ln@PVP NPs. The blue line represents the initial absorption peak of the BiF3: Ln. The red line represents the absorption peak after modifying PVP to the surface of nanoparticlesBack to article page