Three-dimensional diagram of multilayer Au/AgAu core-shell nanostructure embedded by RhB

RhB molecules are embedded in the first layer gap of Au/AgAu core-shell nanostructures with (a) single-layer (Au/AgAu¹-RhB¹), (b) double-layer (Au/AgAu²-RhB¹), and (c) triple-layer (Au/AgAu³-RhB¹) Au/AgAu core-shell nanostructures. RhB molecules were embedded in different positions of the three-gap Au/AgAu core-shell nanostructure: (d) the first gap (Au/AgAu³-RhB¹), (e) the second gap (Au/AgAu³-RhB²), and (f) the third gap (Au/AgAu³-RhB³)

Firstly, gold nanocups were obtained by selectively growing Au on PbS nanooctahedron and then dissolving PbS components. Using gold nanocups as starting substrate, Au/Ag core-shell nanostructures were synthesized by adding growth solution prepared by AgNO₃. Using it as a substrate, the growth solution configured by HAuCl₄ was added to the substrate, and the molar ratio of HAuCl₄ and AgNO₃ added to the growth solution was 1:1. Au/AgAu¹ core-shell nanostructures were obtained through electrical substitution and overgrowth processes.