Team calculates the electronic transport properties of graphene stacks

June 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: Producing graphene layers using crystallization

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).

Related Stories

Producing graphene layers using crystallization

March 2, 2010

( -- 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 ...

Shining Light on Graphene-Metal Interactions

April 2, 2010

( -- 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 details about the ...

Seeing Moire in Graphene

April 27, 2010

( -- 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 that appears when ...

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 Microscopy (EFM).

Recommended for you

Mathematicians identify limits to heat flow at the nanoscale

November 24, 2015

How much heat can two bodies exchange without touching? For over a century, scientists have been able to answer this question for virtually any pair of objects in the macroscopic world, from the rate at which a campfire can ...

New sensor sends electronic signal when estrogen is detected

November 24, 2015

Estrogen is a tiny molecule, but it can have big effects on humans and other animals. Estrogen is one of the main hormones that regulates the female reproductive system - it can be monitored to track human fertility and is ...


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.