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(a) SEM and (b) TEM images of HPB, (c) SEM, (d) TEM, and (e) HRTEM images and particle size distribution (inset) of Er-GQD/HPB; (f,g) show the enlarged HRTEM image of HPB and Er-GQD from selected areas of (e). Insets are the fast Fourier transform (FFT) patterns of HPB and Er-GQD.
