Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Research Gives Insight Into Graphene-Metal Junctions

Abstract:
Graphene, an atom-thin layer of pure carbon, appears to have many of the properties needed to usher in the next generation of electronic devices. The next step in building those devices, however, requires creating junctions that connect graphene to the "external world" through at least two metal wires. A "two-terminal junction" is a graphene "ribbon" with two metal contacts. A University of Arkansas researcher and his colleagues have developed a better understanding of how these graphene-metal interfaces affect the movement of electrons through two-terminal junctions.

Research Gives Insight Into Graphene-Metal Junctions

Fayetteville, AR | Posted on September 19th, 2012

Salvador Barraza-Lopez, assistant professor of physics, Markus Kindermann of Georgia Institute of Technology and M.Y. Chou of Georgia Tech and the Academia Sinica in Taiepi, Taiwan, report their findings in the journal NanoLetters (Nano Lett. 12, pp 3424 [2012]).

"If you want to use graphene for devices, you want to understand what will happen with metal contacts," Barraza-Lopez said.

Current theories about graphene devices assume that the contacts that move electricity from one point to another will also be composed of "doped" graphene, meaning that the contacts have a large amount of electronic charge, as actual metals would have. But contacts in real devices are made of transition metals, and those metal contacts will form bonds with graphene.

"When you form covalent bonds, you destroy the unique electronic properties of graphene," Barraza-Lopez said. "So we thought it was important to calculate the transport of electrons going beyond the assumption that the contacts themselves are (doped) graphene."

He and his colleagues set out to look at how electrons can move through graphene junctions with titanium, which is used by many experimental teams as a contact with graphene: they considered the material properties of actual junctions, and contrasted their findings with more basic models already available. Their calculations were done using the principles of quantum mechanics and state-of-the-art computational facilities.

Within quantum mechanics, the electrons at these graphene-metal junctions behave much like a light beam does when it is shone on a crystal — some of the light scatters and some of it goes through. For graphene junctions the electronic transparency of the material indicates how many of the electrons on one contact make it through the other metal contact. In this work, the researchers have provided the most accurate calculations of the electronic transparency of realistic graphene-metal junctions to date.

"Our results shed light on the complex behavior of graphene junctions … and pave the way for realistic design of potential electronic devices," the researchers wrote.

####

For more information, please click here

Contacts:
Salvador Barraza-Lopez
assistant professor, physics
J. William Fulbright College of Arts and Sciences
479-575-5933


Melissa Lutz Blouin
senior director of academic communications
University Relations
479-575-5555

Copyright © Newswise

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

Graphene

Silicene Labs Announces the Launch of Patent-Pending, 2D Materials Composite Index™ : The Initial 2D Materials Composite Index™ for Q2 2014 Is: 857.3; Founders Include World-Renowned Physicist and Seasoned Business and IP Professionals July 24th, 2014

News and information

Silicene Labs Announces the Launch of Patent-Pending, 2D Materials Composite Index™ : The Initial 2D Materials Composite Index™ for Q2 2014 Is: 857.3; Founders Include World-Renowned Physicist and Seasoned Business and IP Professionals July 24th, 2014

Iranian Scientists Produce Transparent Nanocomposite Coatings with Longer Lifetime July 24th, 2014

Deadline Announced for Registration in 7th Int'l Nanotechnology Festival in Iran July 23rd, 2014

A Crystal Wedding in the Nanocosmos July 23rd, 2014

Chip Technology

A Crystal Wedding in the Nanocosmos July 23rd, 2014

Nanometrics Announces Upcoming Investor Events July 22nd, 2014

Penn Study: Understanding Graphene’s Electrical Properties on an Atomic Level July 22nd, 2014

NUS scientists use low cost technique to improve properties and functions of nanomaterials: By 'drawing' micropatterns on nanomaterials using a focused laser beam, scientists could modify properties of nanomaterials for effective applications in photonic and optoelectric applicat July 22nd, 2014

Discoveries

Iranian Scientists Produce Transparent Nanocomposite Coatings with Longer Lifetime July 24th, 2014

UCF Nanotech Spinout Developing Revolutionary Battery Technology: Power the Next Generation of Electronics with Carbon July 23rd, 2014

A Crystal Wedding in the Nanocosmos July 23rd, 2014

Nano-sized Chip "Sniffs Out" Explosives Far Better than Trained Dogs: TAU researcher's groundbreaking sensor detects miniscule concentrations of hazardous materials in the air July 23rd, 2014

Announcements

Silicene Labs Announces the Launch of Patent-Pending, 2D Materials Composite Index™ : The Initial 2D Materials Composite Index™ for Q2 2014 Is: 857.3; Founders Include World-Renowned Physicist and Seasoned Business and IP Professionals July 24th, 2014

Iranian Scientists Produce Transparent Nanocomposite Coatings with Longer Lifetime July 24th, 2014

Deadline Announced for Registration in 7th Int'l Nanotechnology Festival in Iran July 23rd, 2014

A Crystal Wedding in the Nanocosmos July 23rd, 2014

Research partnerships

A Crystal Wedding in the Nanocosmos July 23rd, 2014

Penn Study: Understanding Graphene’s Electrical Properties on an Atomic Level July 22nd, 2014

More than glitter: Scientists explain how gold nanoparticles easily penetrate cells, making them useful for delivering drugs July 21st, 2014

Tiny laser sensor heightens bomb detection sensitivity July 19th, 2014

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More














ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE