Featured Articles

Broadwell 14nm desktop comes late in Q2 2015

Broadwell 14nm desktop comes late in Q2 2015

A while ago we mentioned that Broadwell won’t show up in the desktop space this year and we got it right.…

More...
Android Wear installed on 10.000+ phones

Android Wear installed on 10.000+ phones

Android Wear should be one of the first steps towards a wearable revolution and so far it is off to a…

More...
AMD A8-7600 Kaveri APU reviewed

AMD A8-7600 Kaveri APU reviewed

Today we'll take a closer look at AMD's A8-7600 APU Kaveri APU, more specifically we'll examine the GPU performance you can…

More...
Samsung launches 850 Pro series SSDs

Samsung launches 850 Pro series SSDs

Samsung launched a new SSD line-up today and it is based on the Korean giant’s cutting edge 3D vertical NAND (V-NAND).

More...
EVGA GTX 780 Classified reviewed

EVGA GTX 780 Classified reviewed

The EVGA GTX 780 Classified has been dethroned as the company’s fastest non-Titan card following the introduction of the GTX 780…

More...
Frontpage Slideshow | Copyright © 2006-2010 orks, a business unit of Nuevvo Webware Ltd.
Wednesday, 27 October 2010 08:37

Boffins fix Graphene with water

Written by Nick Farell


Just like a single malt
Boffins working at Rensselaer Polytechnic Institute have worked out how to use water to tune the band gap of the nanomaterial graphene. The breakthrough opens the door to new graphene-based transistors and nanoelectronics.

Rensselaer Professor Nikhil Koratkar and his research team worked out that if they exposed a graphene film to humidity, they could create a band gap in graphene. This has been the barrier to creating graphene transistors and end the need for semiconducting material made of silicon.

Graphene is an atom-thick sheet of carbon atoms arranged like a nanoscale chain-link fence, Normally it has no band gap. Koratkar’s team worked out how to open a band gap in graphene based on the amount of water they adsorbed to one side of the material, precisely tuning the band gap to any value from 0 to 0.2 electron volts. It was fully reversible and the band gap was reduced back to zero under vacuum. The good part about it, was that the technique does not involve any  complicated engineering or modification of the graphene, but requires an enclosure where humidity can be precisely controlled.

According to the Journal Small, which we get for the electron microscope “spot the ball” competition in its natural state, graphene has a peculiar structure but no band gap. Semiconductors have a narrow band gap, and application of an electric field can provoke electrons to jump across the gap. The ability to quickly switch between the two states — “on” and “off” — is why semiconductors are so valuable in microelectronics. Koratkar said that at the heart of any semiconductor device is a material with a band gap,. Chips and microprocessors in today’s cell phones, mobile devices, and computers, each contains a multitude of transistors made from semiconductors with band gaps. But Graphene is a zero band gap material, which limits its use. By coming up with methods to induce a band gap in graphene to make it a relevant semiconducting material.”

Nick Farell

E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
blog comments powered by Disqus

 

Facebook activity

Latest Commented Articles

Recent Comments