Rational Approaches toward the Design and Synthesis of Carbon Nanothreads

Area of Science:

• Materials Science
• Organic Chemistry
• Nanotechnology

Background:

• Traditional carbon materials often require high-temperature synthesis, limiting structural diversity.
• An emerging class of one-dimensional (1D) carbon materials, nanothreads, are synthesized via kinetically controlled solid-state reactions.
• These nanothreads possess a diamond-like core with potential for tunable mechanical and optical properties.

Purpose of the Study:

• To rationally synthesize carbon nanothreads with desired structures.
• To dictate reactivity in the organic solid state for crystalline 1D carbon material formation.
• To expand chemical diversity and reduce pressure requirements for nanothread synthesis.

Main Methods:

• Utilizing starting materials with reduced aromaticity to enable lower synthesis pressures (15-20 GPa).
• Employing photochemical activation to control reaction pathways and mechanisms.
• Leveraging supramolecular chemistry (e.g., aryl/perfluoroaryl interactions, hydrogen bonds, π-π stacking) for preorganization of reactants.

Main Results:

• Successful formation of nanothreads from diverse reactants, suggesting governed physical organic principles.
• Demonstrated synthesis of crystalline 1D carbon materials under reduced pressure conditions.
• Achieved kinetic control in solid-state reactions, enabling precise structural and functionalization outcomes.

Conclusions:

• Kinetic control in the organic solid state provides a revolutionary approach to access sp3-rich 1D polymeric carbon nanomaterials.
• This method allows for a priori functionalization and design of diverse materials with emergent properties.
• Combines the control of organic chemistry with the unique properties of extended periodic solids.