Team calculates the electronic transport properties of graphene stacks

Jun 23, 2011

Anticipating forthcoming experiments, a CNST team has shown that few layer graphene stacks have favorable transport properties that could enable engineering of novel electronic devices.

There has been significant research examining the properties of monolayer , single sheets of that can be extracted from bulk . However, the same extraction techniques can also make few-layer-thick stacks of graphene sheets.

In this work, the CNST team calculated how the number of sheets and their relative orientation affects the multilayers’electrical conductivity.

In the most energetically favorable case, where half of the carbon atoms on neighboring layers share the same x-y position, the researchers predicted that stacks of three or four sheets should not behave like bulk graphite, but rather like a collection of monolayer and bilayer graphene sheets.

In their calculations, these high-symmetry stacking arrangements exhibited properties particularly promising for future electronics, including a carrier mobility that was higher than that of either a graphene monolayer or bilayer with the same impurity concentration.

The calculations also found that if the stacks were sufficiently pure (comparable to the cleanest graphene monolayers reported in the literature), a transport measurement could be used to identify the number of layers, the stacking orientation, and whether the dominant disorder was due to short-range causes, such as missing , or long-range causes, such charged adsorbates.

Explore further: Tough foam from tiny sheets

More information: Semiclassical Boltzmann transport theory for graphene multilayers, H. Min, P. Jain, S. Adam, and M. D. Stiles, Physical Review B 83, 195117 (2011). prb.aps.org/abstract/PRB/v83/i19/e195117

add to favorites email to friend print save as pdf

Related Stories

Producing graphene layers using crystallization

Mar 02, 2010

(PhysOrg.com) -- Ever since it's relatively recent discovery, graphene has generated a great deal of interest. Graphene is extracted from graphite in many cases, and consists of a sheet of carbon atoms bound together in a ...

Seeing an atomic thickness

May 19, 2011

Scientists from NPL, in collaboration with Linkoping University, Sweden, have shown that regions of graphene of different thickness can be easily identified in ambient conditions using Electrostatic Force ...

Shining Light on Graphene-Metal Interactions

Apr 02, 2010

(PhysOrg.com) -- By controlling the layered growth of graphene - a relatively "new" form of carbon that's just a single atom thick - researchers at Brookhaven National Laboratory have uncovered intriguing ...

Seeing Moire in Graphene

Apr 27, 2010

(PhysOrg.com) -- Researchers at the National Institute of Standards and Technology and the Georgia Institute of Technology have demonstrated that atomic scale moiré patterns, an interference pattern ...

Recommended for you

Tough foam from tiny sheets

18 hours ago

Tough, ultralight foam of atom-thick sheets can be made to any size and shape through a chemical process invented at Rice University.

Graphene surfaces on photonic racetracks

Jul 28, 2014

In an article published in Optics Express, scientists from The University of Manchester describe how graphene can be wrapped around a silicon wire, or waveguide, and modify the transmission of light through it.

Simulating the invisible

Jul 28, 2014

Panagiotis Grammatikopoulos in the OIST Nanoparticles by Design Unit simulates the interactions of particles that are too small to see, and too complicated to visualize. In order to study the particles' behavior, he uses ...

Building 'invisible' materials with light

Jul 28, 2014

A new method of building materials using light, developed by researchers at the University of Cambridge, could one day enable technologies that are often considered the realm of science fiction, such as invisibility ...

User comments : 0