Ru-core/Cu-shell bimetallic nanoparticles with controlled size formed in one-pot synthesis.

Area of Science:

• Materials Science
• Nanotechnology
• Chemistry

Background:

• Bimetallic nanoparticles (NPs) offer unique properties for various applications.
• Controlling the structure and composition of bimetallic NPs is crucial for tailoring their functionality.
• Synthesizing core-shell structures from metals lacking chemical affinity presents a significant challenge.

Purpose of the Study:

• To synthesize and characterize bimetallic ruthenium-copper (RuCu) nanoparticles (NPs).
• To investigate the structural evolution of RuCu NPs with varying compositions.
• To explore a novel method for creating core-shell NPs from immiscible metals.

Main Methods:

• Simultaneous decomposition of organometallic precursors in an ionic liquid to form RuCu NPs.
• Anomalous Small-Angle X-ray Scattering (ASAXS) at the Ru K-edge for structural characterization.
• Analysis of scattering data to determine NP core diameter and shell thickness.

Main Results:

• RuCu NPs were successfully synthesized with a distinct Ru-core, Cu-shell structure.
• The Ru core diameter remained constant at 1.9 nm across all compositions.
• The Cu shell thickness increased with Cu content, reaching up to 0.9 nm.

Conclusions:

• The synthesis method enables the formation of Ru-core/Cu-shell NPs.
• Differential decomposition kinetics of Ru and Cu precursors dictate the core-shell morphology.
• This approach allows for the fabrication of core-shell NPs from metals without inherent chemical affinity.