Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

A small connection with big implications: Wiring up carbon-based electronics

30.04.2014

Research carried out at UPV/EHU, DIPC and CNRS advances the understanding of electric contacts in future carbon-based nanoelectronics


Artistic view of an electric connection between a carbon-based "football" molecule and a single metallic atom (gray ball). The researchers were able to quantify how the current depends on the chemical nature of the contacting atom.

Carbon-based nanostructures such as nanotubes, graphene sheets, and nanoribbons are unique building blocks showing versatile nanomechanical and nanoelectronic properties. These materials which are ordered in the nanoscale, that is, in the dimension of a millionth of millimetre, are promising candidates to envision applications in nanoscale devices, ranging from energy conversion to nano-electronic transistors.

A good connection between carbon-based materials and external metallic leads is of major importance in nanodevice performance, an aspect where an important step has been surmounted by researchers from UPV/EHU, DIPC and CNRS by studying contacts of carbon nanostructures with atoms of different chemical nature.

The chemical nature of contacting leads is of major importance as it affects the electronic properties and the geometry of the contact. The impact of these two aspects on the transport properties are entangled and this group studied these two parameters for contacts shrunk to the limit of individual atoms as for large structures it is challenging to address them separately.

In close collaboration, the researchers used a prototype carbon-based molecule made of 60 carbon atoms arranged in a sphere that can be viewed as a graphene sheet rolled into a tiny ball. The experimental team in Strasbourg led by Guillaume Schull, attached this molecule to the apex of an extremely tiny metal needle of a scanning tunnelling microscope.

The molecule-terminated needle was then cautiously approached to individual metallic atoms of different chemical nature up to the formation of a robust connection. By simultaneously measuring the electrical current passing through these connections, they could deduce which of the individual metallic atom is injecting charges to the carbon-made molecule with the greatest efficiency.

Large-scale computer simulations performed by the theoretical team in San Sebastian led by Thomas Frederiksen, Ikerbasque Research Professor at the DIPC, revealed a fascinating and unexpected aspect of these extremely tiny connections: their electric and mechanical properties are in fact representative for much larger carbon-based materials.

These results, published in the prestigious journal Nature Communications, set the bases to find extremely efficient contacts in the near future. The study paves the way to probe a great number of different metallic species (as well as tiny alloys made of two or three different metallic atoms), allowing for a systematic classification of their abilities to inject electrons into emerging carbon-based electronic devices.

Full research publication (open access)
Chemical control of electrical contact to sp2 carbon atoms
T. Frederiksen, G. Foti, F. Scheurer, V. Speisser, & G. Schul. Nature Communications (2014).
DOI: 10.1038/ncomms4659

Thomas Frederiksen | Eurek Alert!
Further information:
http://www.ehu.es/p200-content/en/contenidos/noticia/20140416_conexion_carbono/en_20140416/20140416_conexion_carbono.html

More articles from Power and Electrical Engineering:

nachricht Imaging Fuel Injectors with Neutrons
17.09.2014 | Oak Ridge National Laboratory

nachricht Study sheds new light on why batteries go bad
15.09.2014 | DOE/SLAC National Accelerator Laboratory

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Anzeige

Anzeige

Event News

"Start-ups and spin-offs funding – Public and private policies", 14th October 2014

12.09.2014 | Event News

BALTIC 2014: Baltic Sea Geologists meet in Warnemünde

03.09.2014 | Event News

IT security in the digital society

27.08.2014 | Event News

 
Latest News

KTH enters the petaflop era with new supercomputer

18.09.2014 | Physics and Astronomy

Researchers convert carbon dioxide into a valuable resource

18.09.2014 | Process Engineering

How do neutron bells toll on the skin of the atomic nucleus?

18.09.2014 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>