Concave cubic gold nanocrystals with high-index facets

Area of Science:

• Materials Science
• Nanotechnology
• Chemistry

Background:

• Gold nanostructures are crucial in catalysis and sensing.
• Controlling nanoparticle morphology influences their properties.
• High-index facets are known to enhance reactivity.

Purpose of the Study:

• To synthesize a novel class of gold nanostructures: concave nanocubes.
• To investigate the role of surfactant counterions in morphology control.
• To compare the chemical activity of these new structures with existing ones.

Main Methods:

• Modified seed-mediated synthesis.
• Utilized chloride (Cl-) counterions in surfactants.
• Characterization of nanostructure morphology and facets.
• Comparative chemical activity assays.

Main Results:

• Successfully prepared monodisperse gold concave nanocubes.
• Identified Cl(-) as critical for achieving concave morphology.
• Concave nanocubes possess 24 high-index {720} facets.
• Demonstrated significantly higher chemical activity in concave nanocubes versus {111}-faceted octahedra.

Conclusions:

• A new synthetic route yields gold concave nanocubes with unique facets.
• Chloride ions are key to templating this specific concave structure.
• The high-index facets of concave nanocubes lead to superior chemical reactivity.