1. How to optically count graphene layers
- Author
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Jaesung Park, Byung Hee Hong, Sosan Cheon, Byeong Jun Lee, Kenneth D. Kihm, Hyeoungkeun Kim, and Joon Sik Lee
- Subjects
Materials science ,Graphene ,business.industry ,Chemical vapor deposition ,Fresnel equations ,Atomic and Molecular Physics, and Optics ,law.invention ,symbols.namesake ,Optics ,law ,symbols ,Thin film ,Surface plasmon resonance ,Raman spectroscopy ,business ,Graphene nanoribbons ,Graphene oxide paper - Abstract
The total thickness of a graphene sample depends upon the number of individually stacked graphene layers. The corresponding surface plasmon resonance (SPR) reflectance alters the SPR angle, depending on the number of graphene layers. Thus, the correlation between the SPR angle shift and the number of graphene layers allows for a nonintrusive, real-time, and reliable counting of graphene layers. A single-layer graphene (SLG) is synthesized by means of chemical vapor deposition, followed by physical transfer to a thin gold film (48 nm) repeatedly, so that multilayer graphene samples with one, three, and five layers can be prepared. Both the measured SPR angles and the entire reflectance curve profiles successfully distinguish the number of graphene layers.
- Published
- 2012