Intertwining Roles of Silver Ions, Surfactants, and Reducing Agents in Gold Nanorod Overgrowth: Pathway Switch between Silver Underpotential Deposition and Gold–Silver Codeposition

摘要: The past two decades have witnessed great success achieved in the geometry-controlled synthesis of metallic nanoparticles using seed-mediated nanocrystal growth method. Detailed mechanistic understanding synergy among multiple key structure-directing agents solutions, however, has long been lagging behind development and optimization synthetic protocols. Here we investigate foreign ion- surfactant-coguided overgrowth single-crystalline Au nanorods as a model system to elucidate intertwining roles Ag+ ions, surface-capping surfactants, reducing that underpin intriguing structural evolution nanocrystals. nanorod involves distinct underlying pathways, Ag underpotential deposition Au–Ag electroless codeposition, which are interswitchable upon maneuvering interplay agents. pathway switch governs geometric composition...