Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Breakthrough for the super material graphene

26.01.2010
The hyper-quick electronics of the future will require new materials and the hottest around is graphene - a single layer of carbon atoms. Graphene produced using a method developed at Linköping University is now being used as part of a study at Chalmers University of Technology, where it has been shown that graphene maintains the same high quality as silicon, thus paving the way for large-scale production.

These promising results have been published in an online edition of the journal Nature Nanotechnology. The research group at Linköping University of Technology, led by Professor Rositza Yakimova, together with a research group at Chalmers, led by Associate Professor Sergey Kubatkin at the Department of Microtechnology and Nanoscience, MC2, along with colleagues in the United Kingdom and Italy, has demonstrated that Swedish graphene offers a high degree of accuracy for quantum mechanical effects - something that is otherwise only achieved in well-established semiconductors such as silicon and gallium arsenide.

The speed of the electrons in silicon - which is currently used to manufacture processors - has reached its limit. In graphene the electrons are 100 times quicker than in silicon and research groups throughout the world are now attempting to produce the material with sufficiently high quality.

Previously it has only been possible to demonstrate promising features on small areas of graphene. In order to progress it must be possible to manufacture the material with a larger area in order to make wafers from which circuits can be constructed. The focus of the research is now on wafers of silicon carbide, where the silicon is removed from the surface leaving a layer of carbon atoms. The advantage is that sufficiently large wafers of silicon carbide are commercially available although ensuring that the graphene is evenly shaped and with sufficient quality over large areas has proved difficult.

"The measurements indicate an improvement of four orders of magnitude or 10,000 times greater accuracy than the best results that have been achieved using exfoliated graphene," says Sergey Kubatkin, Associate Professor at Chalmers University of Technology. The results provide the first resistance standard, i.e. a measure of electronic resistance that is dependent purely on natural constants and which functions at a temperature of 4.2 K. The two resistance standards that have existed up to now are based on silicon or gallium arsenide but only work at very low temperatures and are considerably more difficult to produce and use.

The material that has now been tested successfully is manufactured using a method developed by the Linköping team Rositza Yakimova, Mikael Syväjärvi and Tihomir Iakimov.

"This indicates that Swedish research is world class when it comes to producing new materials that offer sufficiently high performance for use in the electronics of the future," says Mikael Syväjärvi, Associate Professor at the Department of Physics, Chemistry and Biology.

Article: Quantum resistance standard based on epitaxial graphene by A. Tzalenchuk, S. Lara-Avila, A. Kalaboukhov, S. Paolillo, M. Syväjärvi, R. Yakimova, O. Kazakova, T.J.B.M. Janssen, V. Falko and S. Kubatkin. Nature Nanotechnology Advanced Online Publication, January 17, 2010.

Sergey Kubatkin, associate professor, +46(0)31-772 5475, sergey.kubatkin(@)chalmers.se
Mikael Fogelström, professor, +46(0)31-772 3196, mikael.fogelstrom(@)chalmers.se
Rositza Yakimova, professor, +46(0)13-282528, rosya(@)ifm.liu.se
Mikael Syväjärvi, associate professor, +46(0)13-285708, mikael.syväjärvi(@)ifm.liu.se

Pressofficer Sofie Hebrand; +46 736-79 35 90; sofie.hebrand@chalmers.se

Sofie Hebrand | idw
Further information:
http://www.nature.com/nnano/journal/vaop/ncurrent/full/nnano.2009.474.html

More articles from Physics and Astronomy:

nachricht Seeing the quantum future... literally
16.01.2017 | University of Sydney

nachricht Airborne thermometer to measure Arctic temperatures
11.01.2017 | Moscow Institute of Physics and Technology

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

Im Focus: How to inflate a hardened concrete shell with a weight of 80 t

At TU Wien, an alternative for resource intensive formwork for the construction of concrete domes was developed. It is now used in a test dome for the Austrian Federal Railways Infrastructure (ÖBB Infrastruktur).

Concrete shells are efficient structures, but not very resource efficient. The formwork for the construction of concrete domes alone requires a high amount of...

Im Focus: Bacterial Pac Man molecule snaps at sugar

Many pathogens use certain sugar compounds from their host to help conceal themselves against the immune system. Scientists at the University of Bonn have now, in cooperation with researchers at the University of York in the United Kingdom, analyzed the dynamics of a bacterial molecule that is involved in this process. They demonstrate that the protein grabs onto the sugar molecule with a Pac Man-like chewing motion and holds it until it can be used. Their results could help design therapeutics that could make the protein poorer at grabbing and holding and hence compromise the pathogen in the host. The study has now been published in “Biophysical Journal”.

The cells of the mouth, nose and intestinal mucosa produce large quantities of a chemical called sialic acid. Many bacteria possess a special transport system...

Im Focus: Newly proposed reference datasets improve weather satellite data quality

UMD, NOAA collaboration demonstrates suitability of in-orbit datasets for weather satellite calibration

"Traffic and weather, together on the hour!" blasts your local radio station, while your smartphone knows the weather halfway across the world. A network of...

Im Focus: Repairing defects in fiber-reinforced plastics more efficiently

Fiber-reinforced plastics (FRP) are frequently used in the aeronautic and automobile industry. However, the repair of workpieces made of these composite materials is often less profitable than exchanging the part. In order to increase the lifetime of FRP parts and to make them more eco-efficient, the Laser Zentrum Hannover e.V. (LZH) and the Apodius GmbH want to combine a new measuring device for fiber layer orientation with an innovative laser-based repair process.

Defects in FRP pieces may be production or operation-related. Whether or not repair is cost-effective depends on the geometry of the defective area, the tools...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

Nothing will happen without batteries making it happen!

05.01.2017 | Event News

 
Latest News

Multiregional brain on a chip

16.01.2017 | Power and Electrical Engineering

New technology enables 5-D imaging in live animals, humans

16.01.2017 | Information Technology

Researchers develop environmentally friendly soy air filter

16.01.2017 | Power and Electrical Engineering

VideoLinks
B2B-VideoLinks
More VideoLinks >>>