Self-assembly of free-standing graphene nano-ribbons

Pang, Andrew Li Jian; Sorkin, V.; Zhang, Yong‐Wei; Srolovitz, David J.

doi:10.1016/j.physleta.2011.12.039

Cited by 16 publications

(17 citation statements)

References 15 publications

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“…In recent years, tremendous efforts have been devoted to manipulate the graphene morphology, such as graphene folding by growth and transfer from patterned surfaces6, ion radiation7, capillary forces8, mechanical strain91011 and chemical functionalization1213, to controllably design 3D architectures of graphene. The chemical functionalization of pristine graphene sheet by absorbing hydrogen atoms attracts extensive attentions for controlling graphene physical properties as the hydrogenation creates a local geometric distortion by changing the hybridization from sp 2 to sp 3 .…”

mentioning

confidence: 99%

Programmable hydrogenation of graphene for novel nanocages

Zhang

Zeng

Wang

2013

Sci Rep

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Folded graphene has exhibited novel electrical and mechanical properties unmatched by pristine graphene, which implies that morphology of graphene adds the dimensionality of design space to tailor its properties. However, how to overcome the energy barrier of the folding process to fold the graphene with the specific morphology remains unexplored. Here we propose a programmable chemical functionalization by doping a pristine graphene sheet in a certain pattern with hydrogen atoms to precisely control its folding morphology. Molecular dynamics simulation has been performed to create a cross-shaped cubic graphene nanocage encapsulating a biomolecule by warping the top graphene layer downward and the bottom graphene layer upward to mimic the drug delivery vehicle. Such a paradigm, programmable enabled graphene nanocage, opens up a new avenue to control the 3D architecture of folded graphene and therefore provides a feasible way to exploit and fabricate the graphene-based unconventional nanomaterials and nanodevices for drug delivery.

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mentioning

confidence: 99%

Programmable hydrogenation of graphene for novel nanocages

Zhang

Zeng

Wang

2013

Sci Rep

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“…The folding of graphene membranes depends on several factors, like lattice orientations, crystal defects, and possibly adsorbed molecules, as well as on the surrounding environment [25][26][27][28]. A deeper understanding of the mechanism leading to the bending and the folding of the membranes is still an issue and a deeper understanding of the curvature mechanics in graphene is essential to understand the profound relations between its 3D structure and its properties.…”

Section: Mapping Curvature At the Nanoscalementioning

confidence: 99%

Folds and Buckles at the Nanoscale: Experimental and Theoretical Investigation of the Bending Properties of Graphene Membranes

Morandi

Ortolani

Migliori

et al. 2013

Making and Exploiting Fullerenes, Graphene, and Carbon Nanotubes

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The elastic properties of graphene crystals have been extensively investigated, revealing unique properties in the linear and nonlinear regimes, when the membranes are under either stretching or bending loading conditions. Nevertheless less knowledge has been developed so far on folded graphene membranes and ribbons. It has been recently suggested that fold-induced curvatures, without in-plane strain, can affect the local chemical reactivity, the mechanical properties, and the electron transfer in graphene membranes. This intriguing perspective envisages a materials-by-design approach through the engineering of folding and bending to develop enhanced nano-resonators or nano-electro-mechanical devices. Here we present a novel methodology to investigate the mechanical properties of folded and wrinkled graphene crystals, combining transmission electron microscopy mapping of 3D curvatures and theoretical modeling based on continuum elasticity theory and tight-binding atomistic simulations.

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“…When the aspect ratio was large enough, the ultra narrow graphene nanoribbon would have a phase transition from its 2D planar phase to multi-fold or even 3D scroll structure spontaneously. [12][13][14] Other research work also revealed the intrinsic instability and spontaneous twist of the pristine graphene nanoribbon. 15 Its thermodynamic stability is largely due to out-ofplane corrugations.…”

Section: Introductionmentioning

confidence: 94%

Initial Roll Guided Structural Transition of Graphene

2014

NANO

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Molecular dynamics simulations have been performed to study the initial roll guided structural transition of graphene. The°at graphene is thermodynamic metastable and small disturbance can strike its balance and lead to fold. An initial roll at one end causes the graphene layer to transform into double-fold, multi-fold and scroll spontaneously, depending on the size of the initial roll. This unique phenomenon results from the combined action of the van der Waals interaction and the -stacking e®ect. The potential energy of the¯nal structures decreases with the increase of compact level. This study provides crucial simulation input to help guide to designing the required graphene-based nanostructures.

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Self-assembly of free-standing graphene nano-ribbons

Cited by 16 publications

References 15 publications

Programmable hydrogenation of graphene for novel nanocages

Programmable hydrogenation of graphene for novel nanocages

Folds and Buckles at the Nanoscale: Experimental and Theoretical Investigation of the Bending Properties of Graphene Membranes

Initial Roll Guided Structural Transition of Graphene

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