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Oxygen-driven unzipping of graphitic materials
Je-Luen Li1, Konstantin N Kudin, Michael J McAllister
1Department of Chemistry, Princeton University, New Jersey 08544, USA.
Physical Review Letters
|May 23, 2006
Summary
Oxidative processes create fault lines and cracks in graphite oxide (GO), leading to smaller sizes. An unzipping mechanism explains GO crack formation and carbon nanotube cutting in oxidizing acids.
Area of Science:
- Materials Science
- Chemistry
Background:
- Graphite oxide (GO) formation involves oxidative processes.
- The resulting GO materials are significantly smaller than the original graphite.
- Cracks and fault lines are observed in GO structures.
Purpose of the Study:
- To propose and explain an unzipping mechanism for crack formation in GO.
- To elucidate the process of carbon nanotube cutting in oxidizing acids.
- To understand the role of epoxy groups in GO structural changes.
Main Methods:
- Optical microscopy to observe GO structures and fault lines.
- Analysis of oxidative processes in graphite and carbon nanotubes.
- Mechanistic modeling of epoxy group behavior on carbon lattices.
Main Results:
- Observed fault lines and cracks in GO resulting from oxidation.
- Proposed an unzipping mechanism initiated by strain from aligned epoxy groups.
- Demonstrated that epoxy group binding or hopping continues the unzipping process.
- Hypothesized similar mechanisms for oxidized carbon nanotube breakup.
Conclusions:
- The unzipping mechanism provides insight into GO fragmentation.
- Epoxy group dynamics are key to GO structural evolution during oxidation.
- This mechanism is likely applicable to the degradation of oxidized carbon nanotubes.
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