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Preparation of Carbon Nanosheets at Room Temperature
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Graphitization of Glassy Carbon after Compression at Room Temperature.
T B Shiell1, D G McCulloch2,3, D R McKenzie4
1Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University, Canberra, Australian Capital Territory 2601, Australia.
Physical Review Letters
|June 9, 2018
Summary
The pressure limit for glassy carbon
Area of Science:
- Materials Science
- Solid State Physics
- Nanotechnology
Background:
- Glassy carbon is a non-graphitizing material known for its isotropic properties and superelastic recovery under compression.
- Its behavior under extreme pressure, particularly the limit of its unique properties, remains largely unexplored.
Purpose of the Study:
- To determine the pressure threshold at which glassy carbon undergoes permanent structural changes.
- To investigate the transformation mechanisms responsible for these changes under high pressure.
Main Methods:
- High-pressure experiments utilizing diamond anvil cells.
- Advanced computational modeling and simulations.
- Analysis of structural and bonding changes using spectroscopy and diffraction techniques.
Main Results:
- Permanent densification and preferred orientation observed in glassy carbon above 45 gigapascals (GPa).
- 45 GPa identified as the critical limit for superelasticity and non-graphitizing behavior.
- Structural transformation from sp2-rich to sp3-rich phase under pressure.
Conclusions:
- Glassy carbon's unique properties are limited to pressures below 45 GPa.
- High pressure induces a reversible structural transformation to oriented graphite.
- Understanding these pressure-induced changes is crucial for advanced material applications.
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