Facile self-assembly of colloidal diamond from tetrahedral patchy particles via ring selection

Area of Science:

• Materials Science
• Crystallography
• Colloidal Science

Background:

• Diamond crystal structures are attractive for photonic applications.
• Self-assembly of tetrahedral patchy particles into diamond crystals is challenging due to kinetic limitations and competing phases.
• Existing methods offer a narrow window for successful diamond crystal formation.

Purpose of the Study:

• To develop a more robust method for the programmed self-assembly of colloidal diamond crystals.
• To investigate a two-component system of tetrahedral patchy particles for enhanced diamond crystallization.
• To explore the thermodynamic and kinetic factors influencing self-assembly into open lattices.

Main Methods:

• Utilized a two-component system of tetrahedral patchy particles with selective bonding between different particle types.
• Investigated the effect of varying patch widths on crystallization into diamond structures.
• Analyzed the thermodynamic and kinetic properties of the self-assembly process.
• Characterized the resulting crystal structures, including their cubicity.

Main Results:

• The two-component system enables crystallization into diamond crystals over a significantly wider range of patch widths.
• Crystallization is both thermodynamically and kinetically enhanced compared to a one-component system.
• The cubicity of the self-assembled crystals increases with increasing patch width.
• The system facilitates the formation of even-member rings, crucial for diamond lattice assembly.

Conclusions:

• A two-component system offers a scalable bottom-up route for fabricating colloidal diamond crystals.
• This approach overcomes previous kinetic challenges, making diamond crystal assembly more experimentally accessible.
• The findings provide fundamental insights into crystallization processes for open lattice structures.
• The system demonstrates potential for creating novel photonic materials.