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Ag nanostructures with well-defined shapes and optical resonances have been mass-synthesized by a hydrothermal method.Polyvinyl pyrrolidone (PVP) polymers with various average MW, marked as K17, K30, K60, and K90, were chosen as surfactants.All of the reactants was transferred in a 60-mL stainless steel autoclave and heated at a certain temperature for hours.