Crystallization of molecular layers produced under confinement onto a surface

Area of Science:

• Materials Science
• Surface Chemistry
• Crystallography

Background:

• Molecular layers form near surfaces, crucial for various scientific fields.
• Solid-liquid interfaces are widespread, necessitating methods for accessing molecular layers.
• Producing molecular layered crystals is key to exploiting their unique properties.

Purpose of the Study:

• To develop a novel method for producing accessible molecular layered crystals.
• To investigate crystal formation under ultra-thin film confinement.
• To explore the potential for surface-based materials chemistry.

Main Methods:

• Crystallization in ultra-thin puddles.
• Gas blowing technique to enable confinement.
• Utilizing four different molecules with varying polymorphs.

Main Results:

• Successfully produced molecular layered crystals with thickness down to the monolayer.
• Observed exclusive crystallization of polymorphs with Van der Waals interlayer interactions.
• Demonstrated a method not achievable with traditional confinement techniques.

Conclusions:

• The gas blowing approach facilitates surface-confined materials chemistry.
• Enables the formation of distinct crystals with selected polymorphism.
• Provides direct access to molecular layers for characterization and processing.