David Kirkpatrick

October 19, 2010

Mass producing graphene

News from the University of Houston:

University of Houston professor taking next step with graphene research

The 2010 Nobel Prize in Physics went to the two scientists who first isolated graphene, one-atom-thick crystals of graphite. Now, a researcher with the University of Houston Cullen College of Engineering is trying to develop a method to mass-produce this revolutionary material.

Graphene has several properties that make it different from literally everything else on Earth: it is the first two-dimensional material ever developed; the world’s thinnest and strongest material; the best conductor of heat ever found; a far better conductor of electricity than copper; it is virtually transparent; and is so dense that no gas can pass through it. These properties make graphene a game changer for everything from energy storage devices to flat device displays.

Most importantly, perhaps, is graphene’s potential as a replacement for silicon in computer chips. The properties of graphene would enable the historical growth in computing power to continue for decades to come.

To realize these benefits, though, a way to create plentiful, defect-free graphene must be developed. Qingkai Yu, an assistant research professor with the college’s department of electrical and computer engineering and the university’s Center for Advanced Materials, is developing methods to mass-produce such high-quality graphene.

Yu is using a technology known as chemical vapor deposition. During this process, he heats methane to around 1000 degrees Celsius, breaking the gas down into its building blocks of carbon and hydrogen atoms. The carbon atoms then attach to a metallic surface to form graphene.

“This approach could produce cheap, high-quality graphene on a large scale,” Yu said.

Yu first demonstrated the viability of chemical vapor deposition for graphene creation two years ago in a paper in the journal Applied Physics Letters. He has since continued working to perfect this method.

Yu’s initial research would often result in several layers of graphene stacked together on a nickel surface. He subsequently discovered the effectiveness of copper for graphene creation. Copper has since been adopted by graphene researchers worldwide.

Yu’s work is not finished. The single layers of graphene he is now able to create are formed out of multiple graphene crystals that join together as they grow. The places where these crystals combine, known as the grain boundaries, are defects that limit the usefulness of graphene, particularly as a replacement for silicon-based computer chips.

Yu is attempting to create large layers of graphene that form out of a single crystal.

“You can imagine how important this sort of graphene is,” said Yu. “Semiconductors became a multibillion-dollar industry based on single-crystal silicon and graphene is called the post-silicon-era material. So single-crystal graphene is the Holy Grail for the next age of semiconductors.”

 

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Yu is conducting his research in collaboration with UH Ph.D. students Wei Wu and Zhihua Su as well as postdoctoral researcher Zhihong Liu. These efforts have been supported by the National Science Foundation, the U.S. Department of Defense, the U.S. Department of Energy, SEMATECH and the UH Center for Advanced Materials.

 

August 9, 2008

Real health study in virtual world

Filed under: et.al., Media, Science — Tags: , , , , , — David Kirkpatrick @ 7:34 pm

This is both interesting and maybe a harbinger of the future. An actual health study will be conducted in the virtual world of Second Life.

The linked press release:

TORC at UH turns to virtual world of Second Life for new study

International Health Challenge seeks participants for obesity prevention research

The University of Houston department of health and human performance is launching an international effort to recruit 500 participants for a study promoting healthy dietary habits and physical activity. The study will take place entirely in the virtual world of Second Life (SL).

The project is part of the UH Texas Obesity Research Center’s (TORC) International Health Challenge, and offers an enjoyable way for participants to learn about preventing and treating obesity through education, skills training and outreach.

“This is an excellent opportunity to learn and practice these new behaviors in a virtual environment and in real life,” said Rebecca Lee, associate professor and director of TORC. “It’s also a great place to meet other avatars and share information and experiences.”

The TORC International Health Challenge in Second Life will provide opportunities for avatars to earn Lindens—the currency of Second Life—for walking on treadmills, riding bikes and trying new fruits and vegetables in Second Life. Participants compete to earn “Challenge Points” for their healthy behaviors. The country team that earns the most Challenge Points will win the International Health Challenge. Materials will be available in English, French and Spanish.

TORC was an awardee of the University of Southern California-Annenberg School for Communication’s Network Culture Project: Second Life and the Public Good Community Challenge. TORC will develop space in Second Life, create games and interactive learning opportunities and reward avatars when they join the International Health Challenge and participate in health behaviors in Second Life.

“We hope to develop multi-national collaborations in SL to increase awareness, knowledge, skills and support for healthy living,” Lee said. “Reducing obesity is an international priority, and SL provides a portal to an international community.” Lee has conducted extensive research on the subject of obesity, in particular the neighborhood factors that may lead to obesity, such as availability and quality of fresh produce, and the quality and quantity of physical activity resources available in neighborhoods.

 

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Participants must be members of Second Life and can visit http://slurl.com/secondlife/HHP%20at%20UH/128/128/0 to sign up.

For more information, participants can instant message Sirina Felisimo or Samu Sirnah in Second Life or call TORC at 713-743-9310.

For more information about TORC at the University of Houston, please visit: http://grants.hhp.coe.uh.edu/obesity/