Fig. 2: Structural characterization of NBFYE nanoparticles synthesized at different reaction times. | Light: Science & Applications

Fig. 2: Structural characterization of NBFYE nanoparticles synthesized at different reaction times.

From: Hollow nanoparticles synthesized via Ostwald ripening and their upconversion luminescence-mediated Boltzmann thermometry over a wide temperature range

Fig. 2

a Schematic illustration of the morphological evolution of nanoparticles over time. TEM images (b–i) and XRD patterns (j–m) of NBFYE nanoparticles synthesized by adding 1.5 g PAA and 5 mL H2O to the reaction system for different reaction times. (b, f, j) 0 h, (c, g, k) 1 h, (d, h, l) 5 h, and (e, i, m) 9 h

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