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

Date:
April 16, 2014
Source:
University of the Basque Country
Summary:
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 millimeter, are promising candidates to envision applications in nanoscale devices, ranging from energy conversion to nano-electronic transistors.

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.
Credit: Image courtesy of University of the Basque Country

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, and now researchers from UPV/EHU, DIPC and CNRS have taken an important step through studying contacts of carbon nanostructures with atoms of different chemical natures.

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 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.


Story Source:

The above story is based on materials provided by University of the Basque Country. Note: Materials may be edited for content and length.


Journal Reference:

  1. Thomas Frederiksen, Giuseppe Foti, Fabrice Scheurer, Virginie Speisser, Guillaume Schull. Chemical control of electrical contact to sp2 carbon atoms. Nature Communications, 2014; 5 DOI: 10.1038/ncomms4659

Cite This Page:

University of the Basque Country. "A small connection with big implications: Wiring up carbon-based electronics." ScienceDaily. ScienceDaily, 16 April 2014. <www.sciencedaily.com/releases/2014/04/140416090536.htm>.
University of the Basque Country. (2014, April 16). A small connection with big implications: Wiring up carbon-based electronics. ScienceDaily. Retrieved July 31, 2014 from www.sciencedaily.com/releases/2014/04/140416090536.htm
University of the Basque Country. "A small connection with big implications: Wiring up carbon-based electronics." ScienceDaily. www.sciencedaily.com/releases/2014/04/140416090536.htm (accessed July 31, 2014).

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