Two-Dimensional Fullerene Assembly from an Exfoliated van der Waals Template

Area of Science:

• Materials Science
• Nanotechnology
• Chemistry

Background:

• Two-dimensional (2D) materials are typically made by exfoliating bulk crystals.
• Developing bottom-up synthetic methods for 2D materials is crucial for tuning their properties.

Purpose of the Study:

• To assemble a novel 2D material using buckminsterfullerene (C60) as a polymerizable monomer.
• To explore the properties of these synthetically derived 2D materials.

Main Methods:

• C60 building blocks were assembled into a layered solid using a molecular cluster template.
• C60 monolayers within the template were polymerized.
• The resulting polymerized monolayers were exfoliated into 2D crystalline nanosheets.
• Nanosheets were characterized using electronic absorption spectroscopy.

Main Results:

• A novel 2D material was successfully synthesized with a structure consisting of an inorganic cluster layer sandwiched between two polymerized C60 monolayers.
• The synthesized 2D nanosheets exhibited an optical gap of 0.25 eV, which is narrower than that of the bulk material.
• The nanosheets demonstrated reversibility, being transferable and depolymerizable upon heating.

Conclusions:

• A bottom-up strategy for creating synthetic 2D materials from C60 monomers has been established.
• The resulting 2D materials possess tunable electronic properties, indicated by the reduced optical gap.
• This work opens new avenues for designing and fabricating bespoke 2D materials with tailored characteristics.