Synthetic control over lattice strain in trimetallic AuCu-core Pt-shell nanoparticles

Area of Science:

• Materials Science
• Nanotechnology
• Catalysis

Background:

• Core-shell nanoparticles offer enhanced catalytic performance due to lattice strain.
• Investigating lattice strain is crucial but challenging due to a lack of controllable material systems.

Purpose of the Study:

• To develop a controllable core-shell nanoparticle system for systematic study of lattice strain.
• To synthesize trimetallic platinum-shell gold-copper-core nanoparticles with tunable composition and controlled strain.

Main Methods:

• Colloidal synthesis of tunable gold-copper cores.
• Seed-mediated growth for monodisperse cores.
• Epitaxial overgrowth of uniform platinum shells.
• Multi-technique characterization (XRD, electron diffraction, aberration-corrected electron microscopy).

Main Results:

• Successfully synthesized trimetallic Pt-shell Au-Cu-core nanoparticles.
• Achieved tunable Au-Cu core composition (0-77% Cu) and controlled Pt-shell thickness (~3 atomic layers).
• Demonstrated controlled variation of Pt-shell strain from -3.62% (compressive) to +3.79% (tensile).

Conclusions:

• Established a novel core-shell nanoparticle system for precise lattice strain control.
• This system facilitates in-depth investigation of strain effects in catalysis.
• Enables systematic advancement of core-shell catalysis research.