N-th Nanoframes

Abstract

Herein, we report unprecedented four-dimensional complex nanoparticles by embedding various kinds of three-dimensional polyhedral nanoframes within a single entity. This synthetic strategy is based on the selective deposition of metal atoms on high surface energy facets and subsequent growth into solid platonic nanoparticles, followed by the etching of inner metals, leaving complex nanoframes. Our synthetic routes are rationally designed and executable on-demand with a high structural controllability. Diverse Au solid nanostructures (octahedra, truncated octahedra, cuboctahedra, and cubes) evolved into complex multi-layered nanoframes with different numbers/shapes/sizes of internal nanoframes. We refer to the resulting four-dimensional complex nanoframes as “N-th nanoframes”. After coating the surface of the N-th nanoframes with plasmonically active metal (like Ag), the materials exhibited highly enhanced electromagnetic near-field focusing embedded within the internal complicated rim architecture.