Navigation Links
Self-cooling observed in graphene electronics
Date:4/4/2011

CHAMPAIGN, Ill. With the first observation of thermoelectric effects at graphene contacts, University of Illinois researchers found that graphene transistors have a nanoscale cooling effect that reduces their temperature.

Led by mechanical science and engineering professor William King and electrical and computer engineering professor Eric Pop, the team will publish its findings in the April 3 advance online edition of the journal Nature Nanotechnology.

The speed and size of computer chips are limited by how much heat they dissipate. All electronics dissipate heat as a result of the electrons in the current colliding with the device material, a phenomenon called resistive heating. This heating outweighs other smaller thermoelectric effects that can locally cool a device. Computers with silicon chips use fans or flowing water to cool the transistors, a process that consumes much of the energy required to power a device.

Future computer chips made out of graphene carbon sheets 1 atom thick could be faster than silicon chips and operate at lower power. However, a thorough understanding of heat generation and distribution in graphene devices has eluded researchers because of the tiny dimensions involved.

The Illinois team used an atomic force microscope tip as a temperature probe to make the first nanometer-scale temperature measurements of a working graphene transistor. The measurements revealed surprising temperature phenomena at the points where the graphene transistor touches the metal connections. They found that thermoelectric cooling effects can be stronger at graphene contacts than resistive heating, actually lowering the temperature of the transistor.

"In silicon and most materials, the electronic heating is much larger than the self-cooling," King said. "However, we found that in these graphene transistors, there are regions where the thermoelectric cooling can be larger than the resistive heating, which allows these devices to cool themselves. This self-cooling has not previously been seen for graphene devices."

This self-cooling effect means that graphene-based electronics could require little or no cooling, begetting an even greater energy efficiency and increasing graphene's attractiveness as a silicon replacement.

"Graphene electronics are still in their infancy; however, our measurements and simulations project that thermoelectric effects will become enhanced as graphene transistor technology and contacts improve " said Pop, who is also affiliated with the Beckman Institute for Advanced Science, and the Micro and Nanotechnology Laboratory at the U. of I.

Next, the researchers plan to use the AFM temperature probe to study heating and cooling in carbon nanotubes and other nanomaterials.


'/>"/>

Contact: Liz Ahlberg
eahlberg@illinois.edu
217-244-1073
University of Illinois at Urbana-Champaign
Source:Eurekalert  

Related biology technology :

1. Self-cooling observed in graphene elctronics
2. Pfizer Announces EMPHASIS-HF Trial to Halt Recruitment due to Significant Benefit Observed in Patients Treated With Inspra® (Eplerenone)
3. Expanding drug development horizons: Receptor behaviors observed in living cell membranes
4. Expanding drug development horizons: Receptor behaviors observed in living cell membranes
5. DNA engine observed in real-time traveling along base pair track
6. Graphene pioneers follow in Nobel footsteps
7. New graphene-based material clarifies graphite oxide chemistry
8. Researchers discover method for mass production of nanomaterial graphene
9. Light-speed nanotech: Controlling the nature of graphene
10. Scientists prove graphenes edge structure affects electronic properties
11. Graphene yields secrets to its extraordinary properties
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Self-cooling observed in graphene electronics
(Date:2/21/2017)... ... February 21, 2017 , ... VetStem Biopharma, Inc ., ... laboratory in Poway, California. Based upon 12 years of knowledge gained by ... consultants, VetStem constructed and validated a state-of-the-art GMP stem cell manufacturing plant. ...
(Date:2/21/2017)... , Feb. 21, 2017  Lexus, a returning partner of ... as the official and exclusive automobile partner of the men,s and ... race. The 2017 Amgen Tour of California ... and feature some of the best professional cycling teams in the ... May 14-20. The four-day Amgen Breakaway from Heart Disease TM ...
(Date:2/21/2017)... FRANCISCO , Feb. 21, 2017   Invitae ... genetic information companies, today announced that members of the ... Company 37th Annual Health Care Conference on Monday, March ... p.m. Pacific in Boston, Massachusetts . ... presentation may be accessed by visiting the investors section ...
(Date:2/20/2017)... , Feb. 20, 2017 /PRNewswire/ - BioAmber Inc. (NYSE: BIOA ... President and CEO and Fabrice Orecchioni, the company,s COO, has been ... COO over the past four years, Fabrice has overseen the construction, ... and the management of the Mitsui JV.  Fabrice has ... the proposed China JV. ...
Breaking Biology Technology:
(Date:2/7/2017)... --  MedNet Solutions , an innovative SaaS-based eClinical technology ... is pleased to announce that the latest release of ... and award winning eClinical solution, is now available for ... a proven Software-as-a-Service (SaaS) clinical research technology platform that ... delivers an entire suite of eClinical tools to support ...
(Date:2/6/2017)... 2017 According to Acuity Market Intelligence, ... authorities to continue to embrace biometric and digital ... Automated Border Control (ABC) eGates and 1436 Automated ... than 163 ports of entry across the globe. ... a combined CAGR of 37%. APC Kiosks reached ...
(Date:2/2/2017)... , Feb. 2, 2017   TapImmune, ... clinical-stage immuno-oncology company specializing in the development of ... the treatment of cancer and metastatic disease, announced ... and GMP manufacturing of a second clinical lot ... targeting folate receptor alpha. The manufactured vaccine product ...
Breaking Biology News(10 mins):