Nanotechnology Now







Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Spot-welding graphene nanoribbons atom by atom

Abstract:
Scientists at Aalto University and Utrecht University have created single atom contacts between gold and graphene nanoribbons.

Spot-welding graphene nanoribbons atom by atom

Aalto, Finland | Posted on June 13th, 2013

In their article published in Nature Communications, the research team demonstrates how to make electrical contacts with single chemical bonds to graphene nanoribbons. Graphene is a single layer of carbon atoms arranged in a honeycomb lattice. It is anticipated to be a revolutionising material for future electronics.

Graphene transistors functioning at room temperature require working at the size scale of less than 10 nanometres. This means that the graphene nanostructures have to be only a few tens of atoms in width. These transistors will need atomically precise electrical contacts. A team of researchers have now demonstrated experimentally how this can be done.

In their article the scientists address the problem by demonstrating how a single chemical bond can be used to make an electrical contact to a graphene nanoribbon.

- We cannot use alligator clips on the atomic scale. Using well-defined chemical bonds is the way forward for graphene nanostructures to realise their potential in future electronics, says Professor Peter Liljeroth who heads the Atomic Scale Physics group at Aalto University.

The team used atomic force microscopy (AFM) and scanning tunnelling microscopy (STM) to map the structure of the graphene nanoribbons with atomic resolution. The researchers used voltage pulses from the tip of the scanning tunnelling microscope to form single bonds to the graphene nanoribbons - precisely at a specific atomic location. The pulse removes a single hydrogen atom from the end of a graphene nanoribbon and this initiates the bond formation.

- Combined AFM and STM allows us to characterise the graphene nanostructures atom-by-atom, which is critical in understanding how the structure, the bonds with the contacts and their electrical properties are related, explains Dr Ingmar Swart who leads the team concentrating on STM and AFM measurements at Utrecht University

Combining the microscopy experiments with theoretical modelling, the team developed a detailed picture of the contacted nanoribbon properties. The most significant discovery is that a single chemical bond forms an electronically transparent contact with the graphene nanoribbon - without affecting its overall electronic structure. This may be the key to using graphene nanostructures in future electronic devices, as the contact does not change the intrinsic ribbon properties.

- These experiments on atomically well-defined structures allow us to quantitatively compare theory and experiment. This is a great opportunity to test novel theoretical ideas, concludes Dr Ari Harju, leader of the theoretical team in the project at Aalto University.

The study was performed at Aalto University Department of Applied Physics and at the Debye Institute in Utrecht University. The groups at Aalto are part of the Academy of Finland's Centres of Excellence in "Low Temperature Quantum Phenomena and Devices" and "Computational Nanosciences". Academy of Finland and the European Research Council ERC funded the research.

####

For more information, please click here

Contacts:
Peter Liljeroth

358-503-636-115

Copyright © Aalto University

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 Links

Article in Nature Communications ‘Suppression of electron-vibron coupling in graphene nanoribbons contacted via a single atom’ (nature.com):

Related News Press

Graphene

Fullerex launches 2015 edition of the Bulk Graphene Pricing Report January 26th, 2015

News and information

Nanoparticles Increase Durability of Concrete Decorations in Cold Areas January 26th, 2015

Iranian Researchers Boost Solar Cells Efficiency Using Anti-Aggregates January 26th, 2015

Detection of Heavy Metals in Samples with Naked Eye January 26th, 2015

Engineering self-assembling amyloid fibers January 26th, 2015

Chip Technology

Electronic circuits with reconfigurable pathways closer to reality January 26th, 2015

The latest fashion: Graphene edges can be tailor-made: Rice University theory shows it should be possible to tune material's properties January 24th, 2015

New method to generate arbitrary optical pulses January 21st, 2015

New signal amplification process set to transform communications, imaging, computing: UC San Diego researchers discover a mechanism to amplify signals in optoelectronic systems that is far more efficient than standard processes January 21st, 2015

Nanoelectronics

Electronic circuits with reconfigurable pathways closer to reality January 26th, 2015

Rice-sized laser, powered one electron at a time, bodes well for quantum computing January 15th, 2015

Rapid journey through a crystal lattice: Researchers measure how fast electrons move through single atomic layers January 14th, 2015

A new step towards using graphene in electronic applications January 14th, 2015

Discoveries

Visualizing interacting electrons in a molecule: Scientists at Aalto University and the University of Zurich have succeeded in directly imaging how electrons interact within a single molecule January 26th, 2015

Electronic circuits with reconfigurable pathways closer to reality January 26th, 2015

Nanoparticles Increase Durability of Concrete Decorations in Cold Areas January 26th, 2015

Iranian Researchers Boost Solar Cells Efficiency Using Anti-Aggregates January 26th, 2015

Announcements

Nanoparticles Increase Durability of Concrete Decorations in Cold Areas January 26th, 2015

Iranian Researchers Boost Solar Cells Efficiency Using Anti-Aggregates January 26th, 2015

Detection of Heavy Metals in Samples with Naked Eye January 26th, 2015

Engineering self-assembling amyloid fibers January 26th, 2015

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

Visualizing interacting electrons in a molecule: Scientists at Aalto University and the University of Zurich have succeeded in directly imaging how electrons interact within a single molecule January 26th, 2015

Electronic circuits with reconfigurable pathways closer to reality January 26th, 2015

Fullerex launches 2015 edition of the Bulk Graphene Pricing Report January 26th, 2015

Nanoparticles Increase Durability of Concrete Decorations in Cold Areas January 26th, 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







© Copyright 1999-2015 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE