Nanotechnology Now







Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Hot nickel nudges graphene: Rice University lab simplifies manufacture of semiconducting bilayer graphene

This graphic shows the process of creating bilayer graphene on an insulating substrate, skipping the need to transfer graphene from a metal catalyst. The final image, captured with an electron microscope, clearly shows two layers of graphene produced via the process.
 (Credit Tour Lab/Rice University)
This graphic shows the process of creating bilayer graphene on an insulating substrate, skipping the need to transfer graphene from a metal catalyst. The final image, captured with an electron microscope, clearly shows two layers of graphene produced via the process.

(Credit Tour Lab/Rice University)

Abstract:
By heating metal to make graphene, Rice University researchers may warm the hearts of high-tech electronics manufacturers.

Hot nickel nudges graphene: Rice University lab simplifies manufacture of semiconducting bilayer graphene

Houston, TX | Posted on September 15th, 2011

The lab of Rice chemist James Tour published two papers this month that advance the science of making high-quality, bilayer graphene. They show how to grow it on a functional substrate by first having it diffuse into a layer of nickel.

Graphene is commonly grown on a metal catalyst, usually copper, and must be transferred to an electrically insulating substrate like silicon dioxide before it can be used in a circuit. The transfer process is cumbersome and time-consuming and can be as frustrating as manipulating household plastic wrap, Tour said.

The new processes outlined in two related ACS Nano papers (here and here) show large-scale bilayer graphene can be grown directly onto a variety of insulating substrates. They eliminate the transfer process and facilitate the growth of large sheets of semiconducting graphene ready for incorporation into patterned transistors, Tour said.

"The ability to grow bilayer graphene directly onto an insulator can permit electronic device manufacturers to build transistors without the industrially burdensome step of placing one sheet of graphene upon another," said Tour, Rice's T.T. and W.F. Chao Chair in Chemistry as well as a professor of mechanical engineering and materials science and of computer science.

Graphene, the single-atom-thick form of carbon, has been the subject of much study since its discovery in 2004. Tour's lab has become a major player in graphene research by publishing in recent years papers on unzipping nanotubes into graphene nanoribbons, characterizing its electrical properties through lithography, creating transparent electrodes for touch screens and making graphene from a variety of cheap sources, even Girl Scout cookies. All aim to cut the cost and complexity of making graphene and bring it into widespread use.

A single layer of graphene, which at the atomic scale looks like chicken wire, is a semimetal and has no bandgap; this makes it unsuitable for many electronic applications. But bilayer graphene is a semiconductor. Its properties depend upon the offset or rotation of the layers in relation to each other and it is tunable using an electric field applied across the layers.

The new processes depend on the solubility of carbon atoms in hot nickel. In one study, a group led by graduate student Zhiwei Peng evaporated a coat of nickel onto silicon dioxide and placed a polymer film -- the carbon source -- on top.

Heating the sandwich to 1,000 degrees Celsius in the presence of flowing argon and hydrogen gas allowed the polymer to diffuse into the metal; upon cooling, graphene formed on the nickel and on the silicon dioxide surfaces. When the nickel and incidental graphene that formed on top were etched away, bilayer graphene was left attached to the silicon dioxide substrate.

In the other study, graduate student Zheng Yan shuffled the sandwich. He topped a layer of silicon dioxide with a sliver of one of a variety of polymers and then put the nickel on top. Again, under high temperature and low pressure, bilayer graphene formed between the silicon dioxide and nickel. Experimentation with other substances revealed that bilayer graphene would also form on hexagonal boron nitride, silicon nitride and sapphire.

"This type of process eliminates the need for roll-to-roll transfer of the graphene to an electronic substrate, because bilayer graphene can now be grown directly upon the substrate of interest," Tour said.

Authors of the first paper, "Growth of Bilayer Graphene on Insulating Substrates," are Yan, Peng, graduate student Zhengzong Sun, former graduate student Jun Yao, postdoctoral research associates Yu Zhu and Zheng Liu, Tour and Pulickel Ajayan, the Benjamin M. and Mary Greenwood Anderson Professor in Mechanical Engineering and Materials Science and of chemistry.

The Office of Naval Research MURI program, Lockheed Martin and the Air Force Office of Scientific Research supported the research.

Authors of the second paper, "Direct Growth of Bilayer Graphene on SiO2 Substrates by Carbon Diffusion Through Nickel," are Peng, Yan, Sun and Tour.

The Office of Naval Research MURI program, the Air Force Research Laboratory through United Technology Corp., the Air Force Office of Scientific Research and M-I SWACO supported the research.

####

About Rice University
Located on a 285-acre forested campus in Houston, Texas, Rice University is consistently ranked among the nation's top 20 universities by U.S. News & World Report. Rice has highly respected schools of Architecture, Business, Continuing Studies, Engineering, Humanities, Music, Natural Sciences and Social Sciences and is known for its “unconventional wisdom." With 3,485 undergraduates and 2,275 graduate students, Rice's undergraduate student-to-faculty ratio is less than 6-to-1. Its residential college system builds close-knit communities and lifelong friendships, just one reason why Rice has been ranked No. 1 for best quality of life multiple times by the Princeton Review and No. 4 for "best value" among private universities by Kiplinger's Personal Finance. To read "What they're saying about Rice," go to www.rice.edu/nationalmedia/Rice.pdf.

For more information, please click here

Contacts:
David Ruth
713-348-6327


Mike Williams
713-348-6728

Copyright © Rice University

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

ABSTRACT - Growth of Bilayer Graphene on Insulating Substrates:

ABSTRACT - Direct Growth of Bilayer Graphene on SiO2 Substrates by Carbon Diffusion Through Nickel:

Related News Press

News and information

New method allows for greater variation in band gap tunability: The method can change a material's electronic band gap by up to 200 percent January 31st, 2015

Evidence mounts for quantum criticality theory: Findings bolster theory that quantum fluctuations drive strange electronic phenomena January 30th, 2015

Everything You Need To Know About Nanopesticides January 30th, 2015

DNA nanoswitches reveal how life's molecules connect: An accessible new way to study molecular interactions could lower cost and time associated with discovering new drugs January 30th, 2015

Graphene

Discovery Channel taps Angstron Materials for segment featuring graphene advances January 29th, 2015

Creating new materials with quantum effects for electronics January 29th, 2015

Graphenea sales more than double in 2014 January 29th, 2015

Researchers Make Magnetic Graphene: UC Riverside research could lead to new multi-functional electronic devices January 27th, 2015

Govt.-Legislation/Regulation/Funding/Policy

Evidence mounts for quantum criticality theory: Findings bolster theory that quantum fluctuations drive strange electronic phenomena January 30th, 2015

Nanoscale Mirrored Cavities Amplify, Connect Quantum Memories: Advance could lead to quantum computing and the secure transfer of information over long-distance fiber optic networks January 28th, 2015

Detecting chemical weapons with a color-changing film January 28th, 2015

'Bulletproof' battery: Kevlar membrane for safer, thinner lithium rechargeables January 28th, 2015

Chip Technology

Creating new materials with quantum effects for electronics January 29th, 2015

Advantest to Exhibit at SEMICON Korea in Seoul, South Korea February 4-6 Showcasing Broad Portfolio of Semiconductor Products, Technologies and Solutions January 29th, 2015

Researchers Make Magnetic Graphene: UC Riverside research could lead to new multi-functional electronic devices January 27th, 2015

Nanometrics to Present at the Stifel 2015 Technology, Internet and Media Conference January 27th, 2015

Discoveries

New method allows for greater variation in band gap tunability: The method can change a material's electronic band gap by up to 200 percent January 31st, 2015

Evidence mounts for quantum criticality theory: Findings bolster theory that quantum fluctuations drive strange electronic phenomena January 30th, 2015

Everything You Need To Know About Nanopesticides January 30th, 2015

DNA nanoswitches reveal how life's molecules connect: An accessible new way to study molecular interactions could lower cost and time associated with discovering new drugs January 30th, 2015

Announcements

New method allows for greater variation in band gap tunability: The method can change a material's electronic band gap by up to 200 percent January 31st, 2015

Evidence mounts for quantum criticality theory: Findings bolster theory that quantum fluctuations drive strange electronic phenomena January 30th, 2015

Everything You Need To Know About Nanopesticides January 30th, 2015

DNA nanoswitches reveal how life's molecules connect: An accessible new way to study molecular interactions could lower cost and time associated with discovering new drugs January 30th, 2015

Military

Detecting chemical weapons with a color-changing film January 28th, 2015

'Bulletproof' battery: Kevlar membrane for safer, thinner lithium rechargeables January 28th, 2015

Detection of Heavy Metals in Samples with Naked Eye January 26th, 2015

The latest fashion: Graphene edges can be tailor-made: Rice University theory shows it should be possible to tune material's properties January 24th, 2015

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More










ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2015 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE