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Laser thinning for monolayer graphene formation: heat sink and interference effect
Gang Hee Han1, Seung Jin Chae, Eun Sung Kim
1BK21 Physics Division, Department of Energy Science, Center for Nanotubes and Nanostructured Composites, and Sungkyunkwan Advanced Institute of Nanotechnology, Sungkyunkwan University, Suwon 440-746, Korea.
ACS Nano
|December 23, 2010
Summary
Laser irradiation offers a novel method for producing uniform monolayer graphene, overcoming challenges in large-area synthesis. This technique utilizes controlled oxidative burning, preserving the essential monolayer for advanced electronic applications.
Area of Science:
- Materials Science
- Nanotechnology
- Solid State Physics
Background:
- Large-area graphene synthesis via chemical vapor deposition (CVD) is established, but achieving uniform monolayer graphene remains difficult.
- Precise control over graphene layer number is critical for optimizing its electronic properties and device performance.
Purpose of the Study:
- To develop and demonstrate a novel method for acquiring uniform monolayer graphene.
- To investigate the mechanisms and parameters influencing graphene thinning via laser irradiation.
Main Methods:
- Utilizing laser irradiation to induce selective oxidative burning of multilayer graphene.
- In situ monitoring of the graphene thinning process using Raman spectroscopy (G-band shift).
- Modeling heat dissipation and optical properties using Fresnel's equations to understand substrate influence.
Main Results:
- Demonstrated successful acquisition of monolayer graphene through controlled laser-induced oxidative burning.
- Identified light wavelength and substrate optical properties as critical factors for selective burning.
- Confirmed the substrate's role as a heat sink, protecting the underlying monolayer.
- Observed oscillatory thinning behavior correlated with substrate oxide thickness.
Conclusions:
- Laser irradiation provides a viable and controllable method for producing uniform monolayer graphene.
- The substrate's thermal and optical properties are crucial for the success of this graphene thinning technique.
- This method holds promise for fabricating monolayer graphene essential for high-speed electronic devices.
