We synthesize hierarchical flower-like silver microspheres with tunable size and shape. using ascorbic acid as reducing agent and gallic acid as structure-directing agent. The chemical nature of the gallic acid plays a vital role in the process of assembling silver particles into Chinese rose hierarchical structures. By changing the amount of gallic acid or silver nitrate solution (Ag... https://www.petitmorpho.com/product-category/sunglasses/