Integration of Kinetic Control and Lattice Mismatch To Synthesize Pd@AuCu Core–Shell Planar Tetrapods with Size-Dependent Optical Properties

• DOI: 10.1021/acs.nanolett.6b00002
• Publication Date: 2016-04-13T19:30:22Z
• Authors: Min Meng; Zhicheng Fang; Chao Zhang; Hongyang Su; Rong He; Renpeng Zhang; Hongliang Li; Zhi-Yuan Li; Xiaojun Wu; Chao Ma; Jie Zeng
• Keywords: Lattice (music); Discrete dipole approximation

Planar nanocrystals with multiple branches exhibit unique localized surface plasmon resonance properties and great promise in optical applications. Here, we report an aqueous synthesis of Pd@AuCu core–shell planar tetrapods through preferential overgrowth on Pd cubic seeds. The large lattice mismatch between the core AuCu shell is key to induce formation under sluggish reduction kinetics. Meanwhile, capping effect cetyltrimethylammonium chloride {100} facets cubes aspect ratio 1.2 can determine growth direction form a structure. Through simply varying amounts seeds, sizes products be well-controlled range from 33 70 nm. With manipulation sizes, peak position in-plane dipole adjusted visible near-infrared region. Due presence tips edges branches, exhibited excellent surface-enhanced Raman scattering performance enhancement factor up 9.0 × 103 for nm tetrapods.