Highly Crystalline and Semiconducting Imine-Based Two-Dimensional Polymers Enabled by Interfacial Synthesis

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Achieving high crystallinity in 2D polyimine films is crucial for enhancing long-range transport properties.
• Existing interfacial synthesis methods face challenges in maximizing crystallinity.

Purpose of the Study:

• To develop a novel method for synthesizing highly crystalline 2D polyimine-based polymer (PI-2DP) films.
• To investigate the optoelectronic properties of these novel PI-2DP films.

Main Methods:

• Employed a surfactant-monolayer-assisted interfacial synthesis (SMAIS) method.
• Synthesized porphyrin and triazine-containing PI-2DP films with square and hexagonal lattices.
• Characterized film thickness, crystalline domain size, and optoelectronic properties.

Main Results:

• Successfully prepared polycrystalline PI-2DP multilayers with tunable thickness (6-200 nm) and large crystalline domains (100-150 nm).
• Porphyrin-based PI-2DP films exhibited p-type semiconductor behavior.
• Achieved a band gap of 1.38 eV and a hole mobility of 0.01 cm²/V·s, surpassing previous polyimine materials.

Conclusions:

• The SMAIS method enables the preparation of high-crystallinity 2D polyimine films.
• The synthesized PI-2DP materials demonstrate promising optoelectronic properties for potential applications.