Navigation Links
Material world: Graphene's versatility promises new applications
Date:7/9/2009

without scattering. This property is critical for many device applications and has prompted speculation that graphene could eventually supplant silicon as the substance of choice for computer chips, offering the prospect of ultrafast computers operating at terahertz speeds, rocketing past current gigahertz chip technology. Yet, despite encouraging progress, a thorough understanding of graphene's electronic properties has remained elusive. Tao stresses that quantum capacitance measurements are an essential part of this understanding.

Capacitance is a material's ability to store energy. In classical physics, capacitance is limited by the repulsion of like electrical charges, for example, electrons. The more charge you put into a device, the more energy you have to expend to contain it, in order to overcome charge repulsion. However, another kind of capacitance exists, and dominates overall capacitance in a two-dimensional material like graphene. This quantum capacitance is the result of the Pauli exclusion principle, which states that two fermionsa class of common particles including protons, neutrons and electronscannot occupy the same location at the same time. Once a quantum state is filled, subsequent fermions are forced to occupy successively higher energy states. As Tao explains, "it's just like in a building, where people are forced to go to the second floor once the first level is occupied."

In the current study, two electrodes were attached to graphene, and a voltage applied across the material's two-dimensional surface by means of a third, gate electrode. Plots of voltage vs. capacitance can be seen in fig1. In Tao's experiments, graphene's ability to store charge according to the laws of quantum capacitance, were subjected to detailed measurement. The results show that graphene's capacitance is very small. Further, the quantum capacitance of graphene did not precisely duplicate theoretical predictions for the behavior of ideal graphene.
'/>"/>

Contact: Joe Caspermeyer
joseph.caspermeyer@asu.edu
480-727-0369
Arizona State University
Source:Eurekalert  

Page: 1 2 3 4

Related biology technology :

1. Cordex Completes Production of ATPace(TM) Clinical Trial Material
2. Oxford Performance Materials Introduces OXPEKK PermettaTM High Performance Polymer Films
3. Biomimetic-engineering design can replace spaghetti tangle of nanotubes in novel material
4. Tepha Partner Launches Novel Monofilament Absorbable Suture Utilizing Tephas Proprietary Biomaterial
5. SAFC Hitech & Air Water Inc. Extend High-End Materials Research Services Collaboration to Support Japan Chip Industry
6. Putting the squeeze on an old material could lead to instant on electronic memory
7. Connecting Materials Science With Biology, K-State Engineers Create DNA Sensors That Could Identify Cancer Using Material Only One Atom Thick
8. Researchers create catalysts for use in hydrogen storage materials
9. How Long Will the Economic Downturn Affect the Dental Biomaterials Market?
10. MIT: New material could lead to faster chips
11. New organic material may speed Internet access
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Material world: Graphene's versatility promises new applications
(Date:12/24/2014)... , Dec. 24, 2014  United Therapeutics Corporation (NASDAQ: ... MDT ) has submitted a pre-market approval ... for the use of Medtronic,s SynchroMed ® II ... for use with United Therapeutics, Remodulin ® (treprostinil) ...
(Date:12/24/2014)... 24, 2014   BioLife Solutions , Inc. (NASDAQ: ... clinical grade hypothermic storage and cryopreservation freeze ... cells and tissues  ("BioLife" or the "Company"), today announced that ... May 4, 2015 (the "Annual Meeting"). Because the ...
(Date:12/24/2014)... Earlier this year in a June 24 international ... Stem Cell Technology Center, LLC ( ASCTC ) focused attention ... adult tissue stem cells. His title “Asymmetric Self-Renewal by ... Future,” embodied the essence of his message to congress participants. ...
(Date:12/24/2014)... Island, New York (PRWEB) December 23, 2014 ... and the Long Island Affiliate of ITRA Global, the national ... slow but steady recovery. This is evidenced by the ... the strong stock market. Low energy costs have held ...
Breaking Biology Technology:United Therapeutics Announces Submission Of Pre-Market Approval Application For Implantable Drug Infusion System To Deliver Remodulin 2United Therapeutics Announces Submission Of Pre-Market Approval Application For Implantable Drug Infusion System To Deliver Remodulin 3United Therapeutics Announces Submission Of Pre-Market Approval Application For Implantable Drug Infusion System To Deliver Remodulin 4BioLife Solutions Sets Date for Annual Meeting of Stockholders 2Adult Stem Cell Technology Center, LLC’s Director Sherley's Address on What’s Holding Back Regenerative Medicine Featured on Omics Group Website 2Adult Stem Cell Technology Center, LLC’s Director Sherley's Address on What’s Holding Back Regenerative Medicine Featured on Omics Group Website 3Adult Stem Cell Technology Center, LLC’s Director Sherley's Address on What’s Holding Back Regenerative Medicine Featured on Omics Group Website 4ITRA Global Reports Long Island Is Out of Sync With The National Office Market 2ITRA Global Reports Long Island Is Out of Sync With The National Office Market 3
... dedicated to connecting buyers and sellers of technology businesses through ... provides targeted access to buyers and sellers of technology business, ... ... Atlanta, GA (PRWEB) November 18, 2008 -- TechMandA.com ...
... is leveraging its extensive experience in multi-GPU ... media creation to provide scientists, engineers and ... The BOXX Personal Supercomputer (PSC), which will ... during this week,s SC08 Conference, the top ...
... Two-thirds of all port wine stain birthmarks occur on the face. ... that safely fades these reddish-purple skin lesions that can have a huge ... study evaluating the combined use of pulsed dye laser (PDL) therapy and ... , ...
Cached Biology Technology:TechMandA.com Marketplace Streamlines M&A Process for Technology Businesses 2TechMandA.com Marketplace Streamlines M&A Process for Technology Businesses 3BOXX Personal Supercomputer for Research Scientists Featured at SC08 2Pilot Study Finds Adding Topical Imiquimod To Laser Therapy Improves The Response Of Port Wine Stain Birthmarks 2Pilot Study Finds Adding Topical Imiquimod To Laser Therapy Improves The Response Of Port Wine Stain Birthmarks 3Pilot Study Finds Adding Topical Imiquimod To Laser Therapy Improves The Response Of Port Wine Stain Birthmarks 4
(Date:12/17/2014)... fundamentally transforming the travel experience and nowhere is this ... decade, ePassports, biometric readers, and secure document scanners have ... via eGates and Automated Passport Control (APC) Kiosks at ... across the globe. According to ...
(Date:12/11/2014)... 2014 Research and Markets , ... has announced the addition of the "Biometrics Market ... One major trend emerging in this market ... systems utilize more than one characteristic of an individual ...
(Date:12/10/2014)... been here before: you desperately need to sign into your online ... answer to your secret question. What,s your dog,s birthday? Who was ... , a digital infrastructure security company, launches the app ... with usernames, passwords and PINs – 1U TM . ...
Breaking Biology News(10 mins):Automated Border Control (ABC) Transforms the Global Travel Experience With More Than 2500 ABC eGates and APC Kiosks Deployed In Airports, Seaports, and Land Borders Worldwide 2Biometrics Market in India 2015-2019: Key Vendors are 3M Cogent, NEC, Safran and Suprema 2The Password is Finally Dead: Launch of 1U Mobile App Eliminates Need for All Usernames and Passwords 2The Password is Finally Dead: Launch of 1U Mobile App Eliminates Need for All Usernames and Passwords 3
... determining the potential effects pesticides could pose to ... Agency, National Marine Fisheries Service (NMFS), and Fish ... scientific approach, says a new report from the ... use a risk assessment approach that addresses problem ...
... Institute of Environmental Science and Technology at the Universitat ... Political Ecology over the next three years, within the ... to create an international network of expertise in the ... studies that takes into account the multidisciplinary training needed ...
... a recent lottery winner having been exhumed for foul play ... can do to avoid the same fate. A new report ... suggests that riboflavin, also known as vitamin B2, may mitigate ... report shows that zebrafish are a viable model for investigating ...
Cached Biology News:Agencies should use common approach to evaluate risks pesticides pose to endangered species 2Agencies should use common approach to evaluate risks pesticides pose to endangered species 3European support for the first network of research and training in political ecology 2European support for the first network of research and training in political ecology 3Zebrafish study suggests that vitamin B2 (riboflavin) is an antidote to cyanide poisoning 2
Request Info...
Unique enzyme blend containing Taq and Pwo DNA Polymerase and another thermostable enzyme. The Expand 20 kbPLUS PCR System also includes an optimized reaction buffer, MgCl2 solution, and a human cont...
... EC105 power supply is a highly compact, extremely ... single adjustment knob and one hi-lo range switch ... volt increments from 20 to 250 volts. One ... indicating output voltage to output current. For maximum ...
...
Biology Products: