Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Graphene ribbons highly conductive at room temperature

Ballistic graphene ribbons_web.jpg : Conceptual drawing of an electronic circuit comprised of interconnected graphene nanoribbons (black atoms) that are epitaxially grown on steps etched in silicon carbide (yellow atoms). Electrons (blue) travel ballistically along the ribbon and then from one ribbon to the next via the metal contacts. Electron flow is modulated by electrostatic gates © John Hankinson, Georgia Institute of Technology.
Ballistic graphene ribbons_web.jpg : Conceptual drawing of an electronic circuit comprised of interconnected graphene nanoribbons (black atoms) that are epitaxially grown on steps etched in silicon carbide (yellow atoms). Electrons (blue) travel ballistically along the ribbon and then from one ribbon to the next via the metal contacts. Electron flow is modulated by electrostatic gates

© John Hankinson, Georgia Institute of Technology.

Abstract:
An international team including researchers from CNRS, Université de Lorraine, the SOLEIL synchrotron facility[1], Georgia Institute of technology, Oak Ridge National laboratory and Université de Leibniz have achieved a remarkable feat: they have produced graphene ribbons in which electrons move freely. The scientists have devised an entirely novel way of synthesizing such ribbons, and demonstrated their exceptional electrical conductivity at room temperature. The nanoribbons hold out great promise for cutting-edge electronics. The work is published in the 6 February 2014 issue of the journal Nature.

Graphene ribbons highly conductive at room temperature

Paris, France | Posted on February 7th, 2014

Graphene is a material made up of a single layer of atoms that holds tremendous potential. A graphene sheet is around a million times thinner than a hair, more resistant to breakage than steel and yet extremely light. Physically, it takes the form of a honeycomb lattice. When graphene sheets are stacked up, graphite (the grey material in pencil lead) is obtained. In addition, graphene has excellent electrical conductivity: at room temperature, electrons move through it up to 200 times faster than through silicon. Its enormous potential in electronics has triggered much research effort.

A collaboration of physicists from France and the US has been studying the electronic properties of graphene since the early 2000s, with a view to designing a material with very high electron mobility at room temperature. Several years ago, the researchers showed that carbon nanotubes, one of the best-known forms of graphene, can transport electric current ballistically, that is, without encountering resistance within the material. However, carbon nanotubes have proved difficult to manufacture and to insert in large quantities onto electronic chips. As a result, the researchers turned towards another form of graphene: flat ribbons. Similarities in electronic structure between carbon nanotubes and graphene ribbons suggested that they would have analogous conductive properties.

The researchers chose to synthesize this one-dimensional graphene from silicon carbide, a commercially available crystal. Thanks to an ingenious process, they succeeded in obtaining graphene ribbons of very high structural quality, made of an extremely narrow sheet of carbon only 40 nm wide. The main challenge was to ensure that the edges of the ribbon remained highly ordered. This is of paramount importance, since a graphene ribbon with rough edges does not allow good electron propagation. In order to obtain ribbons with regular edges, the trick was to etch nanometer-deep steps into silicon carbide and then produce the graphene ribbons directly on the sidewalls of these steps.

The results exceeded all expectations. The researchers characterized the graphene ribbons produced in this way, which turned out to be ballistic conductors at room temperature: once inside the material, the electrons moved freely without undergoing any scattering. The ribbons thus behaved as waveguides. Charge mobility in these materials exceeded one million cm2/V.s, which would make their electron mobility 1000 times greater than that of the silicon semiconductors (less than 1700 cm2/V.s) used in particular in computer processors and memories. These are the first graphene ribbons to display such conductivity at room temperature.

Another distinctive feature is that the ribbons can be produced easily and in large quantities while keeping the same properties, which makes their large-scale use possible. Because of their exceptional electronic conductivity at room temperature, these new graphene ribbons could find many applications in cutting-edge nanoelectronics.

[1] In France, this work involved the Institut Néel (CNRS) as well as the Institut Jean Lamour (CNRS/Université de Lorraine) and the SOLEIL synchrotron for the characterization of graphene ribbons.

Full bibliographic information

Exceptional ballistic transport in epitaxial graphene nanoribbons. Jens Baringhaus, Ming Ruan, Frederik Edler, Antonio Tejeda, Muriel Sicot, AminaTaleb‐Ibrahimi, An-Pin Li, Zhigang Jiang, Edward Conrad, Claire Berger, Christoph Tegenkamp, Walt A. de Heer. Nature. 6 February 2014.

####

For more information, please click here

Contacts:
Julien Guillaume
+ 33 1 44 96 51 51


CNRS researcher
Claire Berger
T + 1 404 894 7880


CNRS Press Officer
Priscilla Dacher
T +33 1 44 96 46 06

Copyright © AlphaGalileo

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

'Exotic' material is like a switch when super thin April 18th, 2014

Innovative strategy to facilitate organ repair April 18th, 2014

Oxford Instruments Asylum Research Introduces the MFP-3D InfinityTM AFM Featuring Powerful New Capabilities and Stunning High Performance April 18th, 2014

Conductive Inks: booming to $2.8 billion by 2024 April 17th, 2014

Harris & Harris Group Continues Its Blog Series to Highlight Most Impactful Portfolio Companies With Champions Oncology, Inc. April 17th, 2014

Graphene

Thinnest feasible membrane produced April 17th, 2014

Scientists observe quantum superconductor-metal transition and superconducting glass: A team including MIPT physicist observed quantum superconductor-metal transition and superconducting glass April 16th, 2014

Laboratories

Scientists Capture Ultrafast Snapshots of Light-Driven Superconductivity: X-rays reveal how rapidly vanishing 'charge stripes' may be behind laser-induced high-temperature superconductivity April 16th, 2014

'Life Redesigned: The Emergence of Synthetic Biology' Lecture at Brookhaven Lab on Wednesday, April 30: Biomedical Engineer James Collins to Speak for BSA Distinguished Lecture Series April 16th, 2014

Relieving electric vehicle range anxiety with improved batteries: Lithium-sulfur batteries last longer with nanomaterial-packed cathode April 16th, 2014

Govt.-Legislation/Regulation/Funding/Policy

'Exotic' material is like a switch when super thin April 18th, 2014

Innovative strategy to facilitate organ repair April 18th, 2014

Novel stapled peptide nanoparticle combination prevents RSV infection, study finds April 17th, 2014

INSCX™ exchange to present Exchange trade reporting mechanism for engineered nanomaterials (NMs) to UK regulation agencies, insurers and upstream/downstream users April 17th, 2014

Discoveries

'Exotic' material is like a switch when super thin April 18th, 2014

Innovative strategy to facilitate organ repair April 18th, 2014

Thinnest feasible membrane produced April 17th, 2014

More effective kidney stone treatment, from the macroscopic to the nanoscale April 17th, 2014

Announcements

'Exotic' material is like a switch when super thin April 18th, 2014

Innovative strategy to facilitate organ repair April 18th, 2014

Oxford Instruments Asylum Research Introduces the MFP-3D InfinityTM AFM Featuring Powerful New Capabilities and Stunning High Performance April 18th, 2014

Transparent Conductive Films and Sensors Are Hot Segments in Printed Electronics: Start-ups in these fields show above-average momentum, while companies working on emissive displays such as OLED are fading, Lux Research says April 17th, 2014

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals

'Exotic' material is like a switch when super thin April 18th, 2014

Innovative strategy to facilitate organ repair April 18th, 2014

Novel stapled peptide nanoparticle combination prevents RSV infection, study finds April 17th, 2014

Thinnest feasible membrane produced April 17th, 2014

Research partnerships

Novel stapled peptide nanoparticle combination prevents RSV infection, study finds April 17th, 2014

Scientists Capture Ultrafast Snapshots of Light-Driven Superconductivity: X-rays reveal how rapidly vanishing 'charge stripes' may be behind laser-induced high-temperature superconductivity April 16th, 2014

Scalable CVD process for making 2-D molybdenum diselenide: Rice, NTU scientists unveil CVD production for coveted 2-D semiconductor April 8th, 2014

Carbon nanotubes grow in combustion flames April 1st, 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