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Researchers find better way to manufacture fast computer chips
Date:3/31/2009

as a two-dimensional crystal.

Researchers have shown that a single sheet, or even a few sheets, of graphene can exhibit special properties. One such property is very high mobility, in which electrons can pass through it very quickly -- a good characteristic for fast electronics. Another is magnetism: magnetic fields could be used to control the spin of graphene electrons, which would enable spin-based electronics, also called spintronics.

Yet another characteristic is how dramatically graphene's properties change when it touches other materials. That makes it a good candidate material for chemical sensors.

In this method, Padture and his Ohio State colleagues carved graphite into different shapes -- a field of microscopic pillars, for example -- and then stamped the shapes onto silicon oxide surfaces.

"Think of a stack of graphene sheets in graphite as a deck of cards. When you bring it contact with the silicon oxide and pull it away, you can 'split the deck' near the point of contact, leaving some layers of graphene behind. What we found through computer simulations was that the graphene surface interacts so strongly with the silicon oxide surface that the chemical bonds between the graphene layers weaken, and the lower layers split off," Padture said.

In this first series of experiments, the Ohio State researchers were able to stamp high-definition features that were ten layers thick, or thicker. The graphite stamp can then be used repeatedly on other predetermined locations on the same or other substrates, making this a mass-production method, potentially.

They used three different kinds of microscopes -- a scanning electron microscope, optical microscope, and atomic force microscope -- to measure the heights of the features, and assure that they were placed precisely on the substrate.

They eventually hope to stamp narrow features that are only one or two layers thick, by stamping on materials other
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Contact: Nitin Padture
Padture.1@osu.edu
614-247-8114
Ohio State University
Source:Eurekalert

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