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A new nanocomposite: silver nanoparticles (AgNPs) decorated mesoporous silica nanoparticules (MSNs) was prepared.The composite nanostructure was characterized by TEM, SEM and UV-Vis.AgNPs located at the outer surface of MSNs, which restain the specific UV-Vis absorption of AgNPs.The preparation method was simple and environmently friendly, the size and density of AgNPs on the MSNs are tunable by changing the amounts of reactants and reaction conditions.