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. Author manuscript; available in PMC: 2019 Nov 10.
Published in final edited form as: J Control Release. 2018 Sep 25;289:70–78. doi: 10.1016/j.jconrel.2018.09.022

Fig. 2.

Fig. 2.

Characterization of BFNPs. (a) Hydrodynamic size of BFNPs as a function of time. The low variation in hydrodynamic size versus time suggests good stability, (b) UV-Vis-NIR absorption spectrum of BFNPs. (c) PL spectra and (d) upconverted PL spectra of BFNPs under different excitation wavelengths, (e) Hysteresis loop of BFNPs measured at room temperature. The top-left inset shows the respective expanded plots for fields between −4 and 4 Oe. (f) Photothermal heating curves of pure water (control) and BFNPs (0.1, 0.3 and 0.5 mg/mL) in water under 825 nm laser irradiation at a power of 1.5 W/cm2 for 5 min.