The Nature of Metastable AA' Graphite: Low Dimensional Nano- and Single-Crystalline Forms
- The Nature of Metastable AA' Graphite: Low Dimensional Nano- and Single-Crystalline Forms
- 이전국; 문동주; 이재갑; K.P.S.S.Hembram; 김진규; 김용일; 민봉기; 박예슬; 이우영; 이상길; Phillip John
- Graphite; Graphene; AA'; HRTEM; XRD; Structure; Simulation
- Issue Date
- Scientific Reports
- VOL 6-8
- Over the history of carbon, it is generally acknowledged that Bernal AB stacking of the sp2 carbon layers is the unique crystalline form of graphite. The universal graphite structure is synthesized at 2,600~3,000 °C and exhibits a micro-polycrystalline feature. In this paper, we provide evidence for a metastable form of graphite with an AA’ structure. The non-Bernal AA’ allotrope of graphite is synthesized by the thermal- and plasma-treatment of graphene nanopowders at ~1,500 °C. The formation of AA’ bilayer graphene nuclei facilitates the preferred texture growth and results in singlecrystal AA’ graphite in the form of nanoribbons (1D) or microplates (2D) of a few nm in thickness. Kinetically controlled AA’ graphite exhibits unique nano- and single-crystalline feature and shows quasilinear behavior near the K-point of the electronic band structure resulting in anomalous optical and acoustic phonon behavior.
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