Fig. 3.
FTIR spectra of (1) Er-Y2O3, (2) APTES–Er–Y2O3, (3 and 4) PEG–Er-doped Y2O3 nanoparticles (3, 1.0 ng/mL; 4, 30 μg/mL NHS-PEG concentration used for the modification). Arrows indicates peaks at 2,900 and 1,100 cm−1 (see text for details)
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