Computational Modeling and Self-Assembly Synthesis of Borazine-Based Free-Standing Molecular-Thin Films

Area of Science:

• Materials Science
• Nanotechnology
• Computational Chemistry

Background:

• Boron-nitride-rich organic thin materials based on borazines show promise for nano(opto)electronic and energy storage devices.
• Challenges exist in synthesizing effective borazine-based thin films.

Purpose of the Study:

• To address synthetic challenges in producing borazine-based thin films.
• To develop a dual theoretical and experimental protocol for their fabrication.
• To understand molecular interactions governing self-assembly.

Main Methods:

• Utilized a multiscale computational approach combining density functional theory and classical molecular dynamics.
• Employed the Langmuir-Blodgett technique for synthesis and thin-film formation.
• Focused computational modeling on π-π stacking, steric hindrance, and self-assembly orientation.

Main Results:

• Successfully formed a free-standing molecular-thin borazine-based film.
• Identified π-π stacking interactions as the primary driver for bilayer film formation (2.1 nm thickness).
• Demonstrated the film's ability to span 0.6 μm holes and retain molecular crystal features.

Conclusions:

• Established a robust and transferable approach for modeling and synthesizing borazine-based thin materials.
• Deepened the understanding of molecular interactions in borazine self-assembly.
• Confirmed the suitability of the Langmuir-Blodgett technique for fabricating borazine-based 2D materials.