Graphene and its derivatives: switching ON and OFF

Abstract

As the thinnest material ever known in the universe, graphene has been attracting tremendous amount of attention in both materials science and condensed-matter physics since its successful isolation a few years ago. This one-atom-thick two-dimensional pseudo-infinite nano-crystal consists of sp(2)-hybridized aromatic carbon atoms covalently packed into a continuous hexagonal lattice. Graphene exhibits a range of unique properties, viz., high three-dimensional aspect ratio and large specific surface area, superior mechanical stiffness and flexibility, remarkable optical transmittance, extraordinary thermal response and excellent electronic transport properties, promising its applications in the next generation electronics. To switch graphene and its derivatives between ON and OFF states in nanoelectronic memory devices, various techniques have been developed to manipulate the carbon atomic sheets via introducing the valence-conduction bandgap and to enhance their processability. In this article, we review the utilization of electrically, thermally and chemically modified graphene and its polymer-functionalized derivatives for switching and information storage applications. The challenges posed on the development of novel graphene materials and further enhancements of the device switching performance have also been discussed.

In situ synthesized rGO–Fe3O4 nanocomposites as enzyme immobilization support for achieving high activity recovery and easy recycling

“…Among them, the graphene/graphene−based nanosheets have attracted much attention because of their unique structural features and exceptional chemical, electrical and mechanical properties [11][12][13]. Several kinds of enzymes including horseradish peroxidase (HRP) and lipase have been tentatively immobilized on the graphene/graphene−based nanosheets [14][15][16].…”

Oxide Resistive Memory with Functionalized Graphene as Built‐in Selector Element

“…[ 14,15 ] Furthermore, graphene can be readily functionalized or modifi ed to exhibit a number of interesting electrical characteristics, [16][17][18] and resistive switching effects in some graphene based materials, for example graphene oxide, have also been reported. [19][20][21] In this study, we show that RRAM devices can be successfully integrated with graphene electrodes in a compact device structure. More importantly, functionalized graphene electrodes exhibit an intrinsic threshold switching behavior analogous to insulator-metal transition (IMT), and provide a built-in selector element for the RRAM devices that is very desirable for mitigating the sneak path problem in crossbar memory arrays.…”

An amperometric glucose biosensor based on a MnO2/graphene composite modified electrode

“…This is due to its unique electrical, mechanical, and thermal properties. [30][31][32] It is reported that the theoretical specic surface area of graphene can reach 2630 m 2 g À1 , even larger than that of a single-walled carbon nanotube (1300 m 2 g À1 ). 33 Those special properties imply that GR has giant potential in the eld of biosensors.…”