Abstract
Abstract Co@Au core shell nanoparticles (NPs) of different shell thicknesses were fabricated by a combination of the displacement process and the reduction-deposition process in a microfluidic reactor. The effect of the shell thickness on the fine structures (local atom arrangement) of core materials was investigated by X-ray Absorption Near Edge Structure (XANES) and Extended X-ray Absorption Fine Structure (EXAFS). The results indicate that the shell thickness affects the fine structure of the core materials by causing atomic re-arrangement between the hexagonal close pack (hcp) and the face centered cubic (fcc) structure, and forming Co-Au bonds in the core-shell interface.
Highlights
A currently active topic has been focused on the development of multi-component hybrid nanomaterials that can produce multi-mode functions or properties not available in single-component materials [1,2,3,4,5,6]
Characterization of the core and shell microstructure and the related fine structure transition caused by the core and shell remain open fundamental issues, which directly determines the novel discovery on the interaction between their hybrid structures and the related physiochemical properties [20, 24]
Because the Co crystals have 3 crystal structures with only a slight difference in the formation energy [31], there may be some fine structure transitions caused by the Au shell thickness that cannot be revealed by their Selected Area Electron Diffraction (SAED) patterns clearly
Summary
A currently active topic has been focused on the development of multi-component hybrid nanomaterials that can produce multi-mode functions or properties not available in single-component materials [1,2,3,4,5,6].
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