Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Is Graphene the New Silicon?

31.03.2008
Electrons travel through extremely thin form of graphite with little resistivity

Research results from University of Maryland physicists show that graphene, a new material that combines aspects of semiconductors and metals, could be a leading candidate to replace silicon in applications ranging from high-speed computer chips to biochemical sensors.

The research, funded by the National Science Foundation (NSF) and published online in the journal Nature Nanotechnolgy, reveals that graphene conducts electricity at room temperature with less intrinsic resistance than any other known material.

"Graphene is one of the materials being considered as a potential replacement of silicon for future computing," said NSF Program Manager Charles Ying. "The recent results obtained by the University of Maryland scientists provide directions to achieve high-electron speed in graphene near room temperature, which is critically important for practical applications."

Intrinsic resistance results from the unavoidable lattice vibrations in a material when the temperature is greater than absolute zero. The intrinsic resistance determines a material's mobility, or the speed at which an electrons move when an electric field is applied to the material. The very high mobility of graphene makes it promising for applications in which transistors must switch extremely fast, such as in the processing of extremely high frequency signals. If other extrinsic factors that limit mobility in graphene, such as impurities and lattice vibrations in the substrate on which graphene sits, could be eliminated, the intrinsic mobility in graphene would be higher than any other known material, and more than 100 times higher than silicon.

Graphene is also a very promising material for chemical and biochemical sensing applications in which an electrical signal from, for instance, a molecule adsorbed on the sensing device, is translated into an electrical signal by changing the conductivity of the device. The low resistivity and extremely thin nature of graphene also holds promise for applications in thin, mechanically tough, electrically conducting transparent films. Such films are sorely needed in a variety of electronics applications, from touch screens to photovoltaic cells.

Principal investigator Michael Fuhrer of the University of Maryland's Center for Nanophysics and Advanced Materials and the Maryland NanoCenter, said the electrical current in graphene is carried by only a few electrons moving much faster than the electrons in a metal like silver. "Our current samples of graphene are fairly 'dirty' due to some extraneous sources of resistivity," Fuhrer said. "Once we remove that dirt, graphene, at room temperature, should have about 35 percent less resistivity than silver, the lowest resistivity material known at room temperature."

Media Contacts
Diane Banegas, National Science Foundation (703) 292-4489 dbanegas@nsf.gov
Lee Tune, University of Maryland (301) 405-4679 ltune@accmail.umd.edu
Program Contacts
Charles Ying, National Science Foundation (703) 292-8428 cying@nsf.gov
Principal Investigators
Michael Fuhrer, University of Maryland (301) 405-6143 mfuhrer@umd.edu
Related Websites
University of Maryland news release: http://www.newsdesk.umd.edu/scitech/release.cfm?ArticleID=1621

The National Science Foundation (NSF) is an independent federal agency that supports fundamental research and education across all fields of science and engineering, with an annual budget of $5.92 billion. NSF funds reach all 50 states through grants to over 1,700 universities and institutions. Each year, NSF receives about 42,000 competitive requests for funding, and makes over 10,000 new funding awards. The NSF also awards over $400 million in professional and service contracts yearly.

Diane Banegas | EurekAlert!
Further information:
http://www.nsf.gov

More articles from Physics and Astronomy:

nachricht New NASA study improves search for habitable worlds
20.10.2017 | NASA/Goddard Space Flight Center

nachricht Physics boosts artificial intelligence methods
19.10.2017 | California Institute of 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: Neutron star merger directly observed for the first time

University of Maryland researchers contribute to historic detection of gravitational waves and light created by event

On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...

Im Focus: Breaking: the first light from two neutron stars merging

Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.

Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....

Im Focus: Smart sensors for efficient processes

Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).

When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...

Im Focus: Cold molecules on collision course

Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.

How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...

Im Focus: Shrinking the proton again!

Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.

It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ASEAN Member States discuss the future role of renewable energy

17.10.2017 | Event News

World Health Summit 2017: International experts set the course for the future of Global Health

10.10.2017 | Event News

Climate Engineering Conference 2017 Opens in Berlin

10.10.2017 | Event News

 
Latest News

Terahertz spectroscopy goes nano

20.10.2017 | Information Technology

Strange but true: Turning a material upside down can sometimes make it softer

20.10.2017 | Materials Sciences

NRL clarifies valley polarization for electronic and optoelectronic technologies

20.10.2017 | Interdisciplinary Research

VideoLinks
B2B-VideoLinks
More VideoLinks >>>