submit news    HOME | FEEDBACK  


« NAVIGATION »
NEWS

- Bio/Medicine

- Chemicals

- Defense

- Drug Delivery

- Education

- Electronics

- Energy

- Events

- Grants

- Industry

- Investment

- Litigation

- Materials

- MEMS

- Nanofabrication

- Nanoparticles

- Nanotubes

- Optics

- Partnership

- Patent

- Products

- Quantum dots

- Research

- Smart Dust

- Software
COMPANIES
EVENTS

- Browse by Month

- Current Shows

- Previous Shows

- Submit Events
FEEDBACK
ADVERTISE
LINK TO US

« PARTNERS »
Become A Nanotechwire Partner

FEI Company

Veeco Instruments

Nano Science and Technology Institute

National Nanotechnology Initiative

Nanotechnology at Zyvex

Want to see your Company or Organization listed above? Become A Nanotechwire Partner Today - click here
« NEWSLETTER »



« SEARCH »







10/16/2009 6:34:52 PM
Unravelling the secrets of a magic material

UCL researchers are helping to unlock the secrets of a material that could ultimately be used in a new generation of electronic devices.

Graphene is a sheet of carbon just one atom thick – the thinnest known material in the universe and the strongest ever measured.

It is 200 times stronger than steel and can carry one million times more electricity than copper.

These properties give graphene a number of potential new applications, such as its use in the circuitry of faster computers or more powerful mobile phones, but graphene sheets are difficult and expensive to produce.

Professor Dario Alfè and Dr Monica Pozzo (UCL Earth Sciences) are part of a group trying to understand and characterise the mechanisms for the growth of graphene for one particular method of production.

The method, known as Chemical Vapour Decomposition, involves sending hydrocarbon molecules to an iridium surface that is heated between room temperature and 1000 degrees.

When they hit the surface these molecules loose their hydrogen atoms, which fly into space, leaving the remaining carbon atoms sticking to the iridium, where they start to self-assemble in small ‘nano-structures’. The nano-structures eventually develop into fully formed graphene sheets.

Professor Alfè, Dr Pozzo and their colleagues led by Dr Alessandro Baraldi and Dr Silvano Lizzit at ELETTRA, the Synchrotron light laboratory in Trieste, Italy, have begun to unravel how that process takes place, and thus how it might be controlled.

Professor Alfè said: “This method to grow graphene is well known; however, the mechanism that takes us from a carbon-covered surface to the formation of a fully formed graphene sheet is yet to be understood.

“We discovered that the growth of graphene starts with the formation of small islands of carbon with an unusual dome structure, in which only the atoms at the perimeter are bound to the iridium substrate while the central atoms detach from it, making the island bulge upwards at the centre.

“The structure resembles that of the Eden Project building in Cornwall. We also found that the size of these ‘geodesic nanodomes’ depended on the temperature of the iridium substrate, and the manipulation procedure, suggesting possible routes to control the size of graphene sheets at the nanoscale.

“These could be used in the future as building blocks for new generation electronic circuits, for example to make much faster computers, or mobile phones sending data at much higher rates.”

Other Headlines from University College London ...
 - NIMS Signed a Comprehensive Collaborative Agreement with University College London of England
 - "Quantum computer" a stage closer with silicon breakthrough
 - Nano-motors facilitate communication between brain cells
 - Business innovation award for breakthrough nano material
 - Unravelling the secrets of a magic material

More Materials Headlines ...
 - Evidence for Graphene-Sheet-Driven Superconducting State in Graphite Intercalation Compounds
 - Miracle Material
 - UT physicist accelerates simulations of thin film growth
 - New form of girl's best friend is lighter than ever
 - Improved Electrical Conductivity in Polymeric Composites


« Back To List »

« GET LISTED »
- submit company
- submit news
- submit events
- advertise here

« EVENTS »
- More Events


Copyright © 2014 Nanotechwire.com | Privacy Policy |