Modulating Orientational Order to Organize Polyhedral Nanoparticles into Plastic Crystals and Uniform Metacrystals

Area of Science:

• Materials Science
• Nanotechnology
• Crystallography

Background:

• Controlling orientational order in nanoparticle self-assembly is crucial for creating large-area plastic crystals.
• Existing strategies lack methods to precisely modulate this order, limiting supercrystal diversity.

Purpose of the Study:

• To develop a novel strategy for tuning nanoparticle orientational order during self-assembly.
• To achieve two distinct types of supercrystals—plastic crystals and uniform metacrystals—using a single nanoparticle shape.

Main Methods:

• Integration of multi-faceted Archimedean polyhedra with surface polymeric interactions.
• Utilizing coiled surface polymer chains to limit interparticle interactions and promote varied configurations.
• Employing brush-like polymer chains to enable molecular interdigitation and consistent configurations.

Main Results:

• Successfully synthesized two orientationally distinct supercrystals: plastic crystals and uniform metacrystals.
• Demonstrated that coiled polymer chains lead to diverse geometrical configurations, forming plastic crystals.
• Showcased that brush-like polymer chains promote interdigitation, resulting in uniform metacrystals.

Conclusions:

• The developed strategy effectively enhances supercrystal diversity by controlling nanoparticle orientational order.
• This approach is applicable to polyhedra with multiple nondegenerate facets, expanding possibilities in materials design.