Synthesis of Confeito-Like Gold Nanostructures by a Solution Phase Galvanic Reaction

Anisotropic gold nanostructures with “confeito-like shapes” have been synthesized by a solution phase galvanic reaction. The nanostructures are uniform in shape and size (∼300 nm). These nanostructures possess smaller sized protuberances (diameter ∼ 30 nm, length ∼ 40 nm) in large numbers, which are protruding from the body. UV−visible spectrum shows surface plasmon bands at 320, 415, and 530 nm and a broad absorption band extending from 650 nm to the near-infrared region. These nanostructures constitute an active substrate material for surface-enhanced Raman scattering, which was confirmed from representative experiments using rhodamine (R6G) as probe molecule.