| 초록 |
In the present study, we propose a synthetic strategy to prepare Ag/SiO2 hybrid hollow shells based on the chemical reduction of Ag ions on polyvinylpyrrolidone-coated polystyrene (PVP-PS) colloid surface. Well-defined PVP-PS colloids were first synthesized employing styrene as a monomer, 2,2-azobis(isobutyramidine) dihydrochloride as an initiator, and PVP as stabilizers by dispersion polymerization. Ag nanoparticles (NPs) were then grown on the PVP-PS colloidal surfaces using AgNO3 as Ag precursors as well as hydrazine hydrate as reductants for the chemical reduction. The size and surface coverage of Ag NPs were controlled by the changes in mixing ratio of solvents (ethanol/water), concentration of reactants, and molecular weight of PVP. Silica shells were then coated on the PS/Ag NP with tetraorthosilicate precursors by the sol-gel method. After thermal calcination, well-defined Ag/SiO2 hybrid hollow shells were finally obtained. |
