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nanotimes News in Brief

Graphene // New Form of Graphene Could Prevent Electronics from Overheating

© Based on Material by UTexas, US

laptops and other electronics from overheating, ultimately, overcoming one of the largest hurdles to building smaller and more powerful electronic devices.

A

Led by Professor Rodney S. Ruoff in the Cockrell School‘s Department of Mechanical Engineering and the Materials Science and Engineering Program, the research demonstrates for the first time that a type of graphene created by the University of Texas researchers is 60% more effective at managing and transferring heat than normal graphene.

“This demonstration brings graphene a step closer to being used as a conductor for managing heat in a variety of devices. The potential of this material, and its promise for the electronic industry, is very exciting,” said Ruoff, a physical chemist and Cockrell Regents Family Chair, who has pioneered research on graphene-based materials for more than 12 years.

Using a laser to both heat and take measurements of a single-layer of graphene, the researchers found that a type of graphene created by Ruoff and other Uni- versity of Texas researchers is better than any other material tested to date at dissipating heat. Whereas naturally occurring carbon is found at concentrations

new form of graphene created by researchers at The University of Texas at Austin could prevent

of 98.9% 12C (carbon) and 1.1% 13C, the graphene created at The University of Texas at Austin was made of isotopically pure carbon, 99.99% 12C.

“Because self-heating of fast and densely packed devices deteriorates their performance, graphene‘s ability to conduct heat well will be very helpful in improving them,” said Alexander Balandin, a profes- sor of Electrical Engineering, chair of Materials Sci- ence and Engineering at the University of California Riverside and a corresponding author of the research paper. “Initially, graphene would likely be used in some niche applications, such as thermal interface materials for chip packaging or transparent electrodes in photovoltaic solar cells or flexible displays. But, in a few years, the uses of graphene will be diverse, broad and far-reaching because the excellent heat conduction properties of this material are beneficial for all its proposed electronic applications.”

Shanshan Chen, Qingzhi Wu, Columbia Mishra, Junyong Kang, Hengji Zhang, Kyeongjae Cho, Weiwei Cai, Alexan- der A. Balandin, Rodney S. Ruoff: Thermal conductivity of isotopically modified graphene, In: Nature Materials AOP, January 10, 2012, DOI:10.1038/nmat3207: http://dx.doi.org/10.1038/nmat3207

http://bucky-central.me.utexas.edu/index.html

12-01 :: January 2012

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