The Nature of Metastable AA' Graphite: Low Dimensional Nano- and Single-Crystalline Forms

Title
The Nature of Metastable AA' Graphite: Low Dimensional Nano- and Single-Crystalline Forms
Authors
이전국문동주이재갑K.P.S.S.Hembram김진규김용일민봉기박예슬이우영이상길Phillip John
Keywords
Graphite; Graphene; AA'; HRTEM; XRD; Structure; Simulation
Issue Date
2016-12
Publisher
Scientific Reports
Citation
VOL 6-8
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/70187
ISSN
2045-2322
Appears in Collections:
KIST Publication > Article
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