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Altering the physical performance of graphe

Progressive electrochemicgraphene allows the contrlayers and leads to the moproperties of the graphenetransistors (FETs) fabricatgraphene showed improveFurthermore the controlled

opens a route towards patstructures.

Palanisamy Ramesh, Mikhail E. Itkis, Feihu Wang, Elena Bekyarova,University of California at Riverside

Sponsored by NSF-MRSEC through contract DM

Schematic (top) and a photograph (bottom)of FET devices fabricated with pristine and

and electrooxidized graphene.

Georgia Institute of Technology NSF MRSE

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Designing a Graphene-Based B

Ultra-sensitive biosensor applications includetesting blood sugar levels using sweat or saliva(as opposed to blood) or detecting minuteamounts of cancer-related chemical reporters inthe blood stream. Few, if any biosensors cancurrently achieve these goals within practicalconstraints.

The key is to be able to detect and report thepresence of just a few molecules in a solution.The special electronic properties of graphenemake it an ideal candidate material for a novelbiosensor. We have designed an experimentalplatform combining electronic measurementswith microfluidics to systematically interrogategraphenes electronic sensitivity to biomolecular

adsorption on graphenes surface versuschanging concentration.

V. Kodali, M. Bedoya, T. Lamar, J. Scrimgeour, J. E. C

School of Physics, Georgia Institute of Technolog

Sponsored by NSF-MRSEC through contract DM

Georgia Institute of Technology NSF MRSE

PDwithconneechaconrea

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Graphene Growth Scales U

Twonewfurnaceshavarenowproducingunfilmsupto1.7cmindnewproductionmethforgraphenegrownotobescaledupforindelectronics

fabrication

Prof. Walt de Heer, Dr. Claire Berger and Prof. Edward

School of Physics, Georgia Tech

Sponsored by NSF-MRSEC through contract DM

NewRF

furnace

design

produces

1.7cm

diameteruniformgraphenefilms.

Georgia Institute of Technology NSF MRSE

Use this space foranother picture,graphic or figure

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Graphene Inks For Transparent E

The development

solutions is a keywhich will lead prfor flexible electrolow temperature provides an easy solvent based ink

compatible with smethods.

Samuel Graham

Woodruff School of Mechanical Engineering

Sponsored by NSF-MRSEC through contract DM

The reduction of graphene oxide (top) tographene (bottom) while in solution wasmade possible using a combination ofheating and exposure to UV light. Itprovides a scalable way to produce inks.

Georgia Institute of Technology NSF MRSE

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F. Zaman*, M. Moseley, and J. D. MeindlSchool of Electrical and Computer Engineering, Georgia Ins

M. Rubio-Roy*, Y. Hu, C. Berger, and W. A. de

School of Physics, Georgia Institute of Techno* These authors contributed equally to this work.

AlN, deposited by molecularbeam epitaxy and patternedby electron beam lithography,forms an effective cappinglayer for epitaxial graphenegrowth on C-face SiC.

Graphitization in background

Ar pressure of 100 Pa at1420oC eliminates any Sisublimation from regionscovered with AlN.

Thickness:0.6 nm

Measured sheet resistance:1.00.1 k/

Electron density:1.080.06 x 1013 cm-2

Hall mobility:58080 cm2/Vs

Selective Epitaxial Graphene Growth on SiC

Key SugrapSiC Grgrapsuchdete

Optical microscope image ofraphene hall-bar with squareelimiting scanned area. b) 2Dand intensity of scanned area.haracteristic Raman signal forraphene only appears in non-apped areas.

Sponsored by NSF-MRSEC through contract DMR-0820382

Characterization ofSelective Epitaxial Graphene

NoncimagSmavisib

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Dong Sun, Zong-Kwei Wu, Charles Divin and TheodoreCenter for Ultrafast Optical Science, University of Mich

Xuebin Li, Claire Berger, W. A. de Heer, and P. N. F

School of Physics, Georgia Institute ofTechnology

NSF Support: ECCS-0804908 and Georgia Tech MRSEC (DMR-082

In high speed devices, electrons are accelerated to high energy bunderstand device performance, its important to know how thoscattering with each other and with the environment (the graphe

Ultrafast Relaxation of Hot Dirac FEpitaxial Graphene

70 fs

E-E collision cooling

short pulse can heat up the

ectrons; these electronsimic those hot electrons ingh speed electronics devices.

Cold Electron

Hot Electron

Those excited electrons

transfer heat to each otherby collision, and reachequilibrium within 30 fs.

Electrons release

heat by collisionwith the lattice,until they lose alltheir heat.

Very Hot ElectronT

Pump

Interlayer Thermal Coupling of Hot Dirac Fermions in Epitaxial Graphene, APS Marc

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Graphene Times (graphenetimes.com) provides the reader the latest news and research

activities in an interactive and interconnected format. It is created, owned and operated by MikeSprinkle, a MRSEC student at Georgia Tech. Graphene Times currently pulls the newest

graphene articles from arXiv.org, Nano Letters, ACS Nano, Journal of Physical Chemistry-B,Science, Science Express, Physical Review Letters, Physical Review B, Reviews of ModernPhysics, APS journals, Applied Physics Letters, Nature, Nature Materials, Nature Physics, SolidState Communications, and Carbon, in addition to news via Google. Notable features of the

website currently include selective category lists (e.g., all papers, only arXiv preprints, onlyaccepted papers, news, blog entries, etc.), tags (with associated tag lists), search, readerratings/comments, related articles, and direct links to add items to bibliography/bookmarking

sites such as Bibsonomy, CiteULike, Connotea, etc. Commentary will appear directly fromreaders on comment discussion pages and in a more structured ormat through blog entries. nthe average, the Graphene Times serves to about 4,500 to 5,000 unique visitors every month.