Nanotechnology Now





Heifer International

Wikipedia Affiliate Button


DHgate

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

Global Nano-Enabled Packaging Market For Food and Beverages Will Reach $15.0 billion in 2020 May 26th, 2015

Dr.Theivasanthi Slashes the Price of Graphene Heavily: World first & lowest price – Nano-price (30 USD / kg) of graphene by nanotechnologist May 26th, 2015

Fine-tuned molecular orientation is key to more efficient solar cells May 26th, 2015

DNA Double Helix Does Double Duty in Assembling Arrays of Nanoparticles: Synthetic pieces of biological molecule form framework and glue for making nanoparticle clusters and arrays May 25th, 2015

Graphene

Dr.Theivasanthi Slashes the Price of Graphene Heavily: World first & lowest price – Nano-price (30 USD / kg) of graphene by nanotechnologist May 26th, 2015

Haydale Named Lead Sponsor for Cambridge Graphene Festival May 22nd, 2015

Simulations predict flat liquid May 21st, 2015

Laboratories

Engineering Phase Changes in Nanoparticle Arrays: Scientists alter attractive and repulsive forces between DNA-linked particles to make dynamic, phase-shifting forms of nanomaterials May 25th, 2015

Visualizing How Radiation Bombardment Boosts Superconductivity: Atomic-level flyovers show how impact sites of high-energy ions pin potentially disruptive vortices to keep high-current superconductivity flowing May 23rd, 2015

Govt.-Legislation/Regulation/Funding/Policy

Researchers find the 'key' to quantum network solution May 25th, 2015

One step closer to a single-molecule device: Columbia Engineering researchers first to create a single-molecule diode -- the ultimate in miniaturization for electronic devices -- with potential for real-world applications May 25th, 2015

DNA Double Helix Does Double Duty in Assembling Arrays of Nanoparticles: Synthetic pieces of biological molecule form framework and glue for making nanoparticle clusters and arrays May 25th, 2015

Engineering Phase Changes in Nanoparticle Arrays: Scientists alter attractive and repulsive forces between DNA-linked particles to make dynamic, phase-shifting forms of nanomaterials May 25th, 2015

Discoveries

Fine-tuned molecular orientation is key to more efficient solar cells May 26th, 2015

Researchers find the 'key' to quantum network solution May 25th, 2015

One step closer to a single-molecule device: Columbia Engineering researchers first to create a single-molecule diode -- the ultimate in miniaturization for electronic devices -- with potential for real-world applications May 25th, 2015

DNA Double Helix Does Double Duty in Assembling Arrays of Nanoparticles: Synthetic pieces of biological molecule form framework and glue for making nanoparticle clusters and arrays May 25th, 2015

Announcements

Global Nano-Enabled Packaging Market For Food and Beverages Will Reach $15.0 billion in 2020 May 26th, 2015

Dr.Theivasanthi Slashes the Price of Graphene Heavily: World first & lowest price – Nano-price (30 USD / kg) of graphene by nanotechnologist May 26th, 2015

Fine-tuned molecular orientation is key to more efficient solar cells May 26th, 2015

DNA Double Helix Does Double Duty in Assembling Arrays of Nanoparticles: Synthetic pieces of biological molecule form framework and glue for making nanoparticle clusters and arrays May 25th, 2015

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

Global Nano-Enabled Packaging Market For Food and Beverages Will Reach $15.0 billion in 2020 May 26th, 2015

Fine-tuned molecular orientation is key to more efficient solar cells May 26th, 2015

One step closer to a single-molecule device: Columbia Engineering researchers first to create a single-molecule diode -- the ultimate in miniaturization for electronic devices -- with potential for real-world applications May 25th, 2015

DNA Double Helix Does Double Duty in Assembling Arrays of Nanoparticles: Synthetic pieces of biological molecule form framework and glue for making nanoparticle clusters and arrays May 25th, 2015

Research partnerships

Supercomputer unlocks secrets of plant cells to pave the way for more resilient crops: IBM partners with University of Melbourne and UQ May 21st, 2015

Taking control of light emission: Researchers find a way of tuning light waves by pairing 2 exotic 2-D materials May 20th, 2015

Efficiency record for black silicon solar cells jumps to 22.1 percent: Aalto University's researchers improved their previous record by over 3 absolute percents in cooperation with Universitat Politècnica de Catalunya May 18th, 2015

Organic nanoparticles, more lethal to tumors: Carbon-based nanoparticles could be used to sensitize cancerous tumors to proton radiotherapy and induce more focused destruction of cancer cells, a new study shows May 18th, 2015

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