Graphene nanomesh: new versatile materials

There are many practical challenges in the use of graphene materials as active components in electrochemical energy storage devices. Graphene has a much lower capacitance than the theoretical capacitance of 550 F g(-1) for supercapacitors and 744 mA h g(-1) for lithium ion batteries. The macroporous nature of graphene limits its volumetric energy density and the low packing density of graphene-based electrodes prevents its use in commercial applications. Increases in the capacity, energy density and power density of electroactive graphene materials are strongly dependent on their microstructural properties, such as the number of defects, stacking, the use of composite materials, conductivity, the specific surface area and the packing density. The structural design of graphene electrode materials is achieved via six main strategies: the design of non-stacking and three-dimensional graphene; the synthesis of highly packed graphene; the production of graphene with a high specific surface area and high conductivity; the control of defects; functionalization with O, N, B or P heteroatoms; and the formation of graphene composites. These methodologies of structural design are needed for fast electrical charge storage/transfer and the transport of electrolyte ions (Li(+), H(+), K(+), Na(+)) in graphene electrodes. We critically review state-of-the-art progress in the optimization of the electrochemical performance of graphene-based electrode materials. The structure of graphene needs to be designed to develop novel electrochemical energy storage devices that approach the theoretical charge limit of graphene and to deliver electrical energy rapidly and efficiently.

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“…12,76,77 Another advantage of the GO route is that it can facilitate the preparation of graphene-based composites. 89,90 3. 2a).…”

Section: Production Methods For Graphene Electrode Materialsmentioning

confidence: 99%

Structural design of graphene for use in electrochemical energy storage devices

et al. 2015

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“…A direct consequence of the electronic band structure of graphene [4,14] is that graphene-based FET devices are of metallic nature and cannot be switched off at room temperature. Besides chemical modification, graphene nanoribbon, graphene nanomesh, and graphene nanoring, [38] have also been proved as rational designs of the graphene to open a bandgap, yielding an improved transistor I on /I off ratio. Nevertheless, the transistor I on /I off ratio has no direct relation to the performances of a sensor device, although it is related to graphene digital applications requiring high on state current (I on ) and ultra-low power consumption at the off state (I off ) of the transistors.…”

Section: Physics Of Graphene Field-effect Transistors (Gfets): the Bamentioning

confidence: 99%

Sensing at the Surface of Graphene Field‐Effect Transistors

et al. 2016

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Abstract. 10Recent research trends now offer new opportunities for developing the next generations of label-free biochemical sensors using graphene and other two-dimensional materials. While the physics of graphene transistors operated in electrolyte is well grounded, important chemical challenges still remain to be addressed, namely the impact of the chemical functionalizations of graphene on the key electrical parameters and the sensing performances. In fact, graphene -at least ideal graphene -is highly chemically inert. The 15 functionalizations and chemical alterations of the graphene surface -both covalently and non-covalently -are crucial steps that define the sensitivity of graphene. The presence, reactivity, adsorption of gas and ions, proteins, DNA, cells and tissues on graphene have been successfully monitored with graphene. This review aims to unify most of the work done so far on biochemical sensing at the surface of a (chemically functionalized) graphene field-effect transistor and the challenges that lie ahead. We are convinced that graphene biochemical sensors 20 hold great promises to meet the ever-increasing demand for sensitivity, especially looking at the recent progresses suggesting that the obstacle of Debye screening can be overcome.2

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“…Multiple papers (see for a review ref. 9) are devoted to the preparation of large-area graphene nanomeshes (GNM) by now. In particular, I. Jung et al 10.…”

mentioning

confidence: 99%

Bilayered graphene/h-BN with folded holes as new nanoelectronic materials: modeling of structures and electronic properties

Чернозатонский

Demin

Bellucci

2016

Sci Rep

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The latest achievements in 2-dimensional (2D) material research have shown the perspective use of sandwich structures in nanodevices. We demonstrate the following generation of bilayer materials for electronics and optoelectronics. The atomic structures, the stability and electronic properties of Moiré graphene (G)/h-BN bilayers with folded nanoholes have been investigated theoretically by ab-initio DFT method. These perforated bilayers with folded hole edges may present electronic properties different from the properties of both graphene and monolayer nanomesh structures. The closing of the edges is realized by C-B(N) bonds that form after folding the borders of the holes. Stable ≪round≫ and ≪triangle≫ holes organization are studied and compared with similar hole forms in single layer graphene. The electronic band structures of the considered G/BN nanomeshes reveal semiconducting or metallic characteristics depending on the sizes and edge terminations of the created holes. This investigation of the new types of G/BN nanostructures with folded edges might provide a directional guide for the future of this emerging area.

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Graphene nanomesh: new versatile materials

Cited by 100 publications

References 136 publications

Structural design of graphene for use in electrochemical energy storage devices

Structural design of graphene for use in electrochemical energy storage devices

Sensing at the Surface of Graphene Field‐Effect Transistors

Bilayered graphene/h-BN with folded holes as new nanoelectronic materials: modeling of structures and electronic properties

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