Fig. 1. Schematic illustration of SF nanocapsules fabrication using PS spheres as a template. (a) Throw positive charged PS spheres into SF solution. (b) Remove the affluent SF by centrifugation. (c) Treat coated-PS spheres with APTES aqueous solution. (d) Generate silicon nucleus by hydrolytic condensation of APTES. (e) Silicon coating was formed through electrostatic adsorption between SF and silicon nucleus. (f) Repeat coating treatments for several cycles. (g) Centrifuge and wash for several times after the last coating was completed. (h) SF nanocapsules were obtained after removing the cores.
