Fig. 5.
Dispersion stability of (1) APTES–Er–Y2O3, (2 and 3) PEG–Er–Y2O3 nanoparticles (2, 1.0 ng/mL; 3, 30 μg/mL as NHS-PEG concentration used for the modification) in (a) water and (b) Tris buffer (10 mM Tris–HCl, pH 7.4, 100 mM NaCl)
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