Synthesis and Characterization of SiO<sub>2</sub>/ZnO Core-Shell Spheres

This Study applies to Stöber method for synthesis an characterization of even-sized SiO 2 micrometer sphere; and then applies to sol-gel method for encapsulation for one layer of ZnO at SiO 2 spherical surface after regarded it as core so that synthesis SiO 2 /ZnO core-shell spheres successfully. And observe morphology by FE-SEM and crossection by TEM. The TEM specimen were cut by two-beam FIB. Besides, EDS, XRD and UV-Visible spectroscopy were using for the analysis of composition, crystallization structure, and absorption spectrum, respectively. Experimental results showed that, SiO 2 spherical surface became smooth after deposition for zinc oxide. The specimen made by FIB more obviously was observed for core-shell distribution by TEM. EDS analysis made us clearly see shell signal with ZnO content, but core signal only is SiO 2 content. XRD analysis indicated its core-shell sphere signal possessing ZnO content, but UV-Visible absorption spectrometer displayed ZnO has been absorbed in range of UV light, in contrast, it is not absorbed in range of visible light.