Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

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

News and information

Photonic chip guides single photons, even when there are bends in the road February 16th, 2018

Arrowhead Receives Regulatory Clearance to Begin Phase 1/2 Study of ARO-HBV for Treatment of Hepatitis B February 15th, 2018

Arrowhead Pharmaceuticals Receives Orphan Drug Designation for ARO-AAT February 15th, 2018

European & Korean Project To Demo World’s First 5G Platform During Winter Games February 15th, 2018

Graphene/ Graphite

Graphene on toast, anyone? Rice University scientists create patterned graphene onto food, paper, cloth, cardboard February 13th, 2018

A new radiation detector made from graphene: A new bolometer exploits the thermoelectric properties of graphene February 6th, 2018

Engineers develop flexible, water-repellent graphene circuits for washable electronics January 24th, 2018

New catalyst for hydrogen production is a step toward clean fuel: Carbon-based nanocomposite with embedded metal ions yields impressive performance as catalyst for electrolysis of water to generate hydrogen January 16th, 2018

Chip Technology

Photonic chip guides single photons, even when there are bends in the road February 16th, 2018

Graphene on toast, anyone? Rice University scientists create patterned graphene onto food, paper, cloth, cardboard February 13th, 2018

Liquid crystal molecules form nano rings: Quantized self-assembly enables design of materials with novel properties February 7th, 2018

Nanometrics Selected for Fab-Wide Process Control Metrology by Domestic China 3D-NAND Manufacturer: Latest Fab Win Includes Comprehensive Suite for Substrate, Thin Film and Critical Dimension Metrology February 7th, 2018

Discoveries

Photonic chip guides single photons, even when there are bends in the road February 16th, 2018

'Living bandages': NUST MISIS scientists develop biocompatible anti-burn nanofibers February 15th, 2018

Rutgers-Led Innovation Could Spur Faster, Cheaper, Nano-Based Manufacturing: Scalable and cost-effective manufacturing of thin film devices February 14th, 2018

Understanding brain functions using upconversion nanoparticles: Researchers can now send light deep into the brain to study neural activities February 14th, 2018

Announcements

Photonic chip guides single photons, even when there are bends in the road February 16th, 2018

Arrowhead Receives Regulatory Clearance to Begin Phase 1/2 Study of ARO-HBV for Treatment of Hepatitis B February 15th, 2018

Arrowhead Pharmaceuticals Receives Orphan Drug Designation for ARO-AAT February 15th, 2018

European & Korean Project To Demo World’s First 5G Platform During Winter Games February 15th, 2018

Research partnerships

Rutgers-Led Innovation Could Spur Faster, Cheaper, Nano-Based Manufacturing: Scalable and cost-effective manufacturing of thin film devices February 14th, 2018

Understanding brain functions using upconversion nanoparticles: Researchers can now send light deep into the brain to study neural activities February 14th, 2018

Vanadium dioxyde: A revolutionary material for tomorrow's electronics: Phase-chance switch can now be performed at higher temperatures February 5th, 2018

Nanowire LED Innovator Aledia Announces €30 ($36M) Million Series-C Financing: Intel Capital Joins Existing Investors to Commercialize Certain Nanowire-LED Technologies for Mobile Displays January 29th, 2018

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