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Reactivity differences between carbon nano onions (CNOs) prepared by different methods.

Amit Palkar¹, Frederic Melin, Claudia M Cardona

¹Department of Chemistry, Clemson University, SC 29634, USA.

Chemistry, an Asian Journal

|May 1, 2007

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Carbon nano onions (CNOs) synthesized from nanodiamonds are smaller and more reactive than those from graphite arcing. Their enhanced properties make them ideal for studying multi-shelled fullerene applications.

Area of Science:

Nanomaterials Science
Carbon Nanostructures
Fullerene Chemistry

Background:

Carbon nano onions (CNOs), also known as spherical graphite, are composed of concentric fullerene cages.
CNOs can be synthesized via graphite arcing (A-CNOs) or nanodiamond annealing (N-CNOs).

Purpose of the Study:

To compare the physicochemical properties of CNOs produced by different synthesis methods.
To elucidate the relationship between CNO properties and their reactivity.
To identify the most suitable CNOs for exploring applications of multi-shelled fullerenes.

Main Methods:

Synthesis of CNOs using graphite arcing and nanodiamond annealing.
Characterization of CNOs using physicochemical methods.
Evaluation of CNO reactivity in cycloaddition, oxidation, and radical reactions.

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Main Results:

N-CNOs are smaller and exhibit more defects compared to A-CNOs.
N-CNOs demonstrate enhanced reactivity in various chemical reactions.
N-CNOs show greater ease of functionalization.

Conclusions:

Synthesis method significantly impacts CNO properties and reactivity.
Defect density and size influence CNO chemical behavior.
N-CNOs are a promising platform for investigating multi-shelled fullerene applications due to their superior reactivity and functionalization potential.