Carbon Nano-onions: Potassium Intercalation and Reductive Covalent Functionalization

Area of Science:

• Materials Science
• Nanotechnology
• Physical Chemistry

Background:

• Carbon nano-onions (CNOs) are a promising nanomaterial with unique properties.
• Covalent functionalization is key to tailoring CNO properties for specific applications.
• Existing functionalization methods have limitations.

Purpose of the Study:

• To develop a novel reductive approach for covalently functionalizing CNOs.
• To investigate the intercalation process of alkali metals into CNOs.
• To synthesize and characterize novel CNO derivatives.

Main Methods:

• Synthesis of alkali-metal CNO intercalation compounds.
• In situ Raman spectroscopy to study intercalation.
• Electron energy loss spectroscopy (EELS) and X-ray diffraction (XRD) for confirmation.
• Density Functional Theory (DFT) calculations for rationalization.
• Nucleophilic substitution reactions with phenyl and n-hexyl iodide.
• Characterization using Raman spectroscopy, TGA-GC-MS, DLS, UV-vis, and ATR-FTIR.

Main Results:

• Successfully synthesized covalently functionalized CNOs via a reductive route.
• Observed Fano resonance during potassium intercalation, confirmed by EELS and XRD.
• DFT calculations supported experimental findings.
• Synthesized phenyl and n-hexyl functionalized CNOs.
• Comprehensive characterization of the functionalized CNOs.

Conclusions:

• Established a new reductive strategy for CNO covalent functionalization.
• Gained fundamental insights into CNO intercalation mechanisms.
• Demonstrated the potential of functionalized CNOs for applications in energy storage, photovoltaics, and molecular electronics.