Researchers invent new method for graphene growth

Nov 10, 2009 By Anne Ju
A conceptual illustration of an array of single atom-thick graphene transistors. Image: Shivank Garg

( -- A Cornell research team has invented a simple way to make graphene electrical devices by growing the graphene directly onto a silicon wafer.

Single layers of , called sheets, are lightweight, strong, electrically semi-conducting -- and notoriously difficult and expensive to make.

Now, a Cornell research team has invented a simple way to make graphene electrical devices by growing the graphene directly onto a wafer. The work was published online Oct. 27 in the journal .

Graphene is often hailed as potentially supplanting silicon in electronics, with its remarkable strength, despite its one atom-thick sheets, and its off-the-charts . But making it in large quantities is a challenge, and scientists have turned to methods as crude as using scotch tape to pull off a layer of graphene from , the material found in pencil lead. Such methods would never survive manufacturing, especially since it would produce graphene with varying numbers of layers at random positions.

"You can imagine trying to peel a piece of shrink wrap off a dish to put it on a new dish -- it's going to be messy," said lead researcher Jiwoong Park, Cornell assistant professor of chemistry and chemical biology.

Inspired by previous work in which scientists grew graphene on copper foil, the team grew the graphene directly onto coated with a special evaporated copper film. They then cut the graphene films into their desired shapes using such standard methods as photolithography, and removed the underlying copper with a chemical solution. What was left was a graphene film that draped down over the silicon wafer with little defect.

"Once the graphene is made on top of this wafer, you can apply any thin-film processing technique," Park said.

The team is now experimenting with growing full-scale, four-inch graphene wafers, which would further demonstrate the manufacturing potential of graphene-based electronics.

The paper's first author is Mark P. Levendorf, a graduate student in chemistry, and co-authors are Carlos S. Ruiz-Vargas, a graduate student in applied and engineering physics, and Shivank Garg '10, an undergraduate majoring in chemistry.

Provided by Cornell University (news : web)

Explore further: Project uses crowd computing to improve water filtration

Related Stories

Light-speed nanotech: Controlling the nature of graphene

Jan 21, 2009

Researchers at Rensselaer Polytechnic Institute have discovered a new method for controlling the nature of graphene, bringing academia and industry potentially one step closer to realizing the mass production ...

Graphene oxide paper could spawn a new class of materials

Jul 25, 2007

Nearly 2,000 years ago, the discovery of paper revolutionized human communication. Now researchers at Northwestern University have fabricated a new type of paper that they hope will create a revolution of its own -- and while ...

Unzipping Carbon Nanotubes Can Make Graphene Ribbons

Apr 20, 2009

( -- By "unzipping" carbon nanotubes, researchers have shown how to make flat graphene ribbons. Graphene, which is a one-atom-thick sheet of carbon that looks like chicken wire, has unique electrical ...

Physics graduate creates graphene resonator

Feb 18, 2007

In the world of cutting-edge physics, discoveries are often made using intricate procedures and elaborate, expensive instruments. But a paper by Cornell graduate student Scott Bunch and colleagues shows how ...

AMO Manufactures First Graphene Transistors

Feb 08, 2007

In the scope of his innovative project ALEGRA the AMO nanoelectronics group of Dr. Max Lemme was able to manufacture top-gated transistor-like field-effect devices from monolayer graphene.

Recommended for you

Project uses crowd computing to improve water filtration

12 hours ago

Nearly 800 million people worldwide don't have access to safe drinking water, and some 2.5 billion people live in precariously unsanitary conditions, according to the Centers for Disease Control and Prevention. ...

Engineering the world's smallest nanocrystal

16 hours ago

In the natural world, proteins use the process of biomineralization to incorporate metallic elements into tissues, using it to create diverse materials such as seashells, teeth, and bones. However, the way ...

A stretchy mesh heater for sore muscles

Jul 03, 2015

If you suffer from chronic muscle pain a doctor will likely recommend for you to apply heat to the injury. But how do you effectively wrap that heat around a joint? Korean Scientists at the Center for Nanoparticle ...

Polymer mold makes perfect silicon nanostructures

Jul 03, 2015

Using molds to shape things is as old as humanity. In the Bronze Age, the copper-tin alloy was melted and cast into weapons in ceramic molds. Today, injection and extrusion molding shape hot liquids into ...

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.