direct electron transferring of glucose oxidase was investigated   on reduced graphene and graphene oxide templates. the direct electrochemistry   glucose oxidase on   graphene showed a cyclic voltammograms corresponding to the fad/fadh 2   redox couple with an anodic, cathodic and formal potential of -430, -460 and   -445 mv, respectively in 0.1 m phosphate buffer solution and air saturated   ...

CNRS Laboratoire de Photonique et de Nanostructures, Route de Nozay, 91460 Marcoussis, France, LPMC, Département de Physique, Faculté des Sciences de Tunis, Université Tunis-Manar, Campus Universitaire, 1060 Tunis, Tunisia, Laboratoire National de Métrologie et d’Essais, 29 Avenue Roger Hennequin, 78197 Trappes, France, Laboratoire de Physique des Solides, CNRS UMR 8502, Université Paris-Sud, 9...

We report measurements of disordered graphene probed by both a high electric field and a high magnetic field. By applying a high source-drain voltage, Vsd, we are able to study the current-voltage relation I-Vsd of our device. With increasing Vsd, a crossover from the linear I-Vsd regime to the non-linear one, and eventually to activationless-hopping transport occurs. In the activationless-hopp...

E. R. Mucciolo,1 A. H. Castro Neto,2 and C. H. Lewenkopf3,4 Department of Physics, University of Central Florida, P.O. Box 162385, Orlando, Florida 32816, USA Department of Physics, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, USA Departamento de Fı́sica Teórica, Universidade do Estado do Rio de Janeiro, 20550-900 Rio de Janeiro, Brazil Laboratório Nacional de Luz Sı́n...

We develop an effective medium theory to study the electrical transport properties of disordered graphene. The theory includes nonlinear screening and exchange-correlation effects allowing us to consider experimentally relevant strengths of the Coulomb interaction. Assuming random Coulomb impurities, we calculate the electrical conductivity as a function of gate voltage describing quantitativel...

graphene-based nanocomposites are newly emerged materials with a wide range of applications such as in supercapacitors electrode. the high conductivity and ability for passing electric current, makes graphene an appropriate new item to be used in cells. electroactive transition metal oxides, owing fast reversible redox pairs, are used to store electrical charge. furthermore, the graphene/nio na...

We simulate electron transport through graphene nanoribbons of realistic size containing a p-n junction patterned by electrostatic gates. For a sharp p-n interface, Klein tunneling leads to refocusing of a divergent beam forming a Veselago lens. Wider transition regions allow only electrons with near-perpendicular incidence to pass the junction, forming a Klein collimator. Using a third nearest...

In this review, we provide an account of the recent progress in understanding electronic transport in disordered graphene systems. Starting from a theoretical description that emphasizes the role played by band structure properties and lattice symmetries, we describe the nature of disorder in these systems and its relation to transport properties. While the focus is primarily on theoretical and...

Yury P. Bliokh,1,2 Valentin Freilikher,1,3 Sergey Savel’ev,1,4 and Franco Nori1,5 1Advanced Science Institute, The Institute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama 351-0198, Japan 2Department of Physics, Technion-Israel Institute of Technology, Haifa 32000, Israel 3Department of Physics, Jack and Pearl Resnick Institute of Advanced Technology, Bar-Ilan University, Ramat-Ga...