178138.fig.003a
(a)
178138.fig.003b
(b)
178138.fig.003c
(c)
178138.fig.003d
(d)
Figure 3: Wide scan of Fe3O4@SiO2 (a) and Fe3O4@SiO2-CAAQ NPs (b), C1s core-level (c) and N1s core-level (d) spectra of Fe3O4@SiO2-CAAQ NPs.