435205.fig.003a
(a)
435205.fig.003b
(b)
435205.fig.003c
(c)
435205.fig.003d
(d)
Figure 3: TEM images of the nanoparticles with SiO2 capping. The reaction time of the SiO2 capping: (a) 1 hour and (b) 4 hours. (c) High-magnification TEM image of the SiO2 capped nanoparticles. (d) Electron diffraction pattern of the SiO2-capped nanoparticles.