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Synthesis of Atomically Thin Hexagonal Diamond with Compression
Feng Ke1,2,3, Lingkong Zhang1, Yabin Chen4,5
1Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China.
Nano Letters
|June 25, 2020
Summary
Researchers synthesized pristine diamane, a 2D diamond allotrope, by compressing few-layer graphene. This breakthrough opens possibilities for novel carbon-based electronic devices.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Diamane, an atomically thin diamond, is a 2D carbon allotrope with significant potential.
- Achieving a pristine diamane structure has been a major challenge in materials science.
Purpose of the Study:
- To demonstrate the successful synthesis of pristine diamane.
- To characterize the properties of the synthesized diamane.
- To explore its potential applications in electronics.
Main Methods:
- Mechanically exfoliating few-layer graphene.
- Applying high pressure (above 20 GPa) at room temperature to induce diamondization.
- Utilizing resistance, optical absorption, and X-ray diffraction for characterization.
- Performing theoretical calculations to confirm stability and properties.
Main Results:
- Successful synthesis of hexagonal diamane (h-diamane) from trilayer and thicker graphene.
- Characterized h-diamane exhibits a bandgap of 2.8 ± 0.3 eV.
- The synthesized h-diamane is stable upon decompression to ~1.0 GPa.
- Theoretical calculations confirm the energetic stability of (-2110)-oriented h-diamane.
Conclusions:
- Pristine diamane can be synthesized via high-pressure compression of few-layer graphene.
- The resulting semiconducting h-diamane has a significant bandgap, unlike graphene.
- This discovery paves the way for advanced carbon-based electronic devices.
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