PDF Publication Title:
Text from PDF Page: 151
9 Electronic Transport Properties of Few-Layer Graphene Materials S. Russo1, M. F. Craciun1, T. Khodkov1, M. Koshino2, M. Yamamoto3 and S. Tarucha3 1Centre for Graphene Science, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter 2Department of Physics, Tohoku University, Sendai 3Department of Applied Physics, The University of Tokyo, Tokyo 1United Kingdom 2,3Japan 1. Introduction Since the discovery of graphene -a single layer of carbon atoms arranged in a honeycomb lattice - it was clear that this truly is a unique material system with an unprecedented combination of physical properties (Geim & Novoselov (2007); Novoselov et al. (2004); Novoselov & Jiang et al. (2005); Novoselov & Geim (2005); Zhang et al. (2005)). Graphene is the thinnest membrane present in nature -just one atom thick- it is the strongest material (Lee et al. (2008)), it is transparent (Nair et al. (2008)), bendable (Bae et al. (2010); Kim et al. (2009)) and it is a very good conductor (Novoselov & Jiang et al. (2005); Novoselov & Geim (2005)) with room temperature charge mobilities larger than the typical mobilities found in silicon. The significance played by this new material system is even more apparent when considering that graphene is the thinnest member of a larger family: the few-layer graphene materials (FLGs). Even though several physical properties are shared between graphene and its few-layers, recent theoretical and experimental advances demonstrate that each specific thickness of few-layer graphene is a material with unique physical properties (Craciun et al. (2011)). All few layers graphene are good conductors. However, striking differences in the nature of this conductive state emerge when a perpendicular electric field generated by gate voltages is applied onto the few-layers. In a single layer graphene transistor, the current is modulated by a gate voltage but it cannot be switched off since in the energy dispersion of graphene there is no band-gap (valence and conduction bands touch each other) (Novoselov & Jiang et al. (2005); Novoselov&Geim (2005)). Recent experimental advances showed that bilayer graphene, also characterized by touching valence and conduction bands, develops an energy gap when subjected to an external perpendicular electric field (Zhang et al. (2009)). Bilayer graphene is the only known semiconductor with a gate tuneable band-gap. Opposed to the case of single- and bi-layer, the trilayer material is a semimetal with a gate-tuneable band overlap between the conduction and the valence band. Indeed, the conductivity of trilayers increases when a perpendicular electric field is applied onto the system (Craciun et al. (2009)). The variety of physical properties found in different FLGs is the true strength of these newlyPDF Image | GRAPHENE SYNTHESIS CHARACTERIZATION PROPERTIES
PDF Search Title:
GRAPHENE SYNTHESIS CHARACTERIZATION PROPERTIESOriginal File Name Searched:
Graphene-Synthesis.pdfDIY PDF Search: Google It | Yahoo | Bing
Salgenx Redox Flow Battery Technology: Power up your energy storage game with Salgenx Salt Water Battery. With its advanced technology, the flow battery provides reliable, scalable, and sustainable energy storage for utility-scale projects. Upgrade to a Salgenx flow battery today and take control of your energy future.
| CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com | RSS | AMP |