Wednesday 27 July 2011

Is Graphene a miracle material?

Is graphene a miracle material?

The material graphene was touted as "the next big thing" even before its pioneers were handed the Nobel Prize last year. Many believe it could spell the end for silicon and change the future of computers and other devices forever.
Graphene has been touted as the "miracle material" of the 21st Century.
Said to be the strongest material ever measured, an improvement upon and a replacement for silicon and the most conductive material known to man, its properties have sent the science world - and subsequently the media - into a spin.


WHAT IS GRAPHENE?
Graphene illustration
Graphene is taken from graphite, which is made up of weakly bonded layers of carbon
Graphene is composed of carbon atoms arranged in tightly bound hexagons just one atom thick
Three million sheets of graphene on top of each other would be 1mm thick
The band structure of graphite was first theorised and calculated by PR Wallace in 1947, though for it to exist in the real world was thought impossible
Due to the timing of this discovery, some conspiracy theorists have linked it to materials at the Roswell "crash site"
In 2004, teams including Andre Geim and Konstantin Novoselov demonstrated that single layers could be isolated, resulting in the award of the Nobel Prize for Physics in 2010
It is a good thermal and electric conductor and can be used to develop semiconductor circuits and computer parts. Experiments have shown it to be incredibly strong

"Our research establishes graphene as the strongest material ever measured, some 200 times stronger than structural steel," mechanical engineering professor James Hone, of Columbia University, said in a statement.
"It would take an elephant, balanced on a pencil, to break through a sheet of graphene the thickness of Saran Wrap [cling film]."
And the way this material can be utilised is as surprising as its properties.
"Graphene does not just have one application," says Professor Andre Geim, the current co-holder of the Nobel Prize in physics for his work with the material at Manchester University.
"It is not even one material. It is a huge range of materials. A good comparison would be to how plastics are used."
Much has been made of graphene's potential. It can be used for anything from composite materials - like how carbon-fibre is used currently - to electronics.
Since its properties were uncovered, more and more scientists have been keen to work on projects. About 200 companies and start-ups are now involved in research around graphene. In 2010, it was the subject of about 3,000 research papers.
And the benefits to both businesses and to the consumer are obvious - faster and cheaper devices which are thinner and flexible.
"You could theoretically roll up your iPhone and stick it behind your ear like a pencil," Professor James Tour, of Rice University, told the Technology Review.


We feel that it's rather difficult to imagine graphene as a replacement to silicon
Dr Phaedon Avouris, IBM

If graphene can be compared to the way plastic is used today, everything from crisp packets to clothing could be digitised once the technology is established. The future could see credit cards contain as much processing power as your current smartphone.
"It can open completely new applications in transparent electronics, in flexible electronics and electronics that are much faster than today," says Jari Kinaret, professor of technology at Chalmers University in Sweden.
And beyond its digital applications, just one example of its use would be graphene powder added to tyres to make them stronger.

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