Mechanical Properties of Monolayer Graphene Oxide

Suk, Ji Won; Piner, Richard D.; An, Jinho; Ruoff, Rodney S.

doi:10.1021/nn101781v

Cited by 1,067 publications

(702 citation statements)

References 60 publications

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“…35 In that case, the size of the AFM tip was 23.9 nm, which is larger than our AuNPs. In this regard, the pressure applied on GO is even greater in our system.…”

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confidence: 64%

Evaporation induced wrinkling of graphene oxide at the nanoparticle interface

Wang

Liu

2015

Nanoscale

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With the thickness of only a single atomic layer, graphene displays many interesting surface properties. A general observation is that wrinkles are formed on graphene oxide (GO) when it is dried in the presence of adsorbed inorganic nanoparticles. In this case, evaporation induced wrinkling is not an elastic deformation but is permanent. Understanding the nanoscale force of wrinkle formation is important for device fabrication and sensing. Herein, we employ surface functionalized gold nanoparticles (AuNPs) as a model system. All tested AuNPs induced wrinkling, including those capped by DNA, polymers and proteins. The size of AuNPs is less important compared to the property of solvent. Wrinkle formation is attributed to drying related capillary force acting on the GO surface, and a quantitative equation is derived. After drying, the adsorption affinity between GO and AuNPs is increased due to increased contact area.

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“…35 In that case, the size of the AFM tip was 23.9 nm, which is larger than our AuNPs. In this regard, the pressure applied on GO is even greater in our system.…”

mentioning

confidence: 64%

Evaporation induced wrinkling of graphene oxide at the nanoparticle interface

Wang

Liu

2015

Nanoscale

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“…3 The plentiful amount of oxygen-containing functional groups on GO sheets provide easy modification of GO for various applications. 4,5 Biopolymer surface-functionalized GO nanosheets were reported to be biocompatible and non-toxic at low concentrations.…”

Section: Introductionmentioning

confidence: 99%

One-Step Synthesis of Graphene Oxide–Polyamidoamine Dendrimer Nanocomposite Hydrogels by Self-Assembly

Piao

Chen

2016

Ind. Eng. Chem. Res.

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Graphene oxide (GO)-polyamidoamine (PAMAM) dendrimer nanocomposite hydrogels were prepared through one-step synthesis by mixing a GO suspension and a PAMAM solution at varying ratio of GO to PAMAM. The materials self-assembled into physically crosslinked networks, mainly driven by electrostatic interactions between the oppositely charged GO nanosheets and PAMAM dendrimer. The chemical structure of PAMAM dendrimer was studied by mass spectrometry, nuclear magnetic resonance spectroscopy and potentiometric titration.The structure and properties of GO-PAMAM nanocomposite hydrogels were investigated by Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray diffraction, scanning electron microscopy and rheometry. The nanocomposite hydrogels exhibited a relatively high mechanical performance with a storage modulus of up to 284 kPa, as well as self-healing property, owing to their reversible and multiple physical cross-links. These hydrogels may be further developed for biomedical applications.2

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“…It is, however, important to note that this class of materials is likely to intrinsically consist of multi--layers although single--layer structures have been synthesized. It has been shown that for 2D materials, such as graphene 37 and graphene oxide, 38 there exists a linear relationship between the elastic moduli and the number of layers. Accordingly, an enhanced mechanical strength of a multi--layered structure is anticipated.…”

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confidence: 99%

Two-dimensional covalent triazine framework as an ultrathin-film nanoporous membrane for desalination

2015

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We computationally demonstrate that two--dimensional covalent traizine frameworks (CTFs) provide opportunties in water desalination. By varying the chemical building blocks, the pore structure, chemistry, and membrane performance can be designed, leading to two orders of mangnutide higher water permeability than polyamide membranes while maintaining excellent ability to reject salts.Water scarcity is one of the most prominent challenges in modern society. 1,2 Due to the rapid growth of the world population and the accelerated industrialization of developing countries, fresh water has become increasingly scarce. Although 75% of the earth's surface is covered with water, more than 97% of it is seawater that cannot be used directly. Much of the remaining fresh water is locked in glaciers and snowfields, leaving less than 1% of the world's water available for human consumption. Despite the vast availability of seawater, the production of fresh water using processes that separate salt ions from saline water (i.e., desalination) remains negligible (less than 1%) when compared to global demand, primarily due to high costs and large energy consumption. 3 To facilitate clean water production via desalination, much recent attention has been given to improving the cost--effectiveness and energy--efficiency of reverse osmosis (RO) desalination processes, which account for roughly two thirds of installed capacity. In particular, new membranes with enhanced water permeability compared to currently available polyamide--based membranes may have an important role to play in lowering energy consumption. 4 Several nanostructured materials have been previously investigated as promising membrane candidates such as carbon nanotubes (CNTs) 5,6,7 and zeolites 8,9 . Despite CNTs' high water permeability, 5 membranes based on CNTs exhibit poor salt rejection, and it remains challenging to fabricate membranes with dense, well--aligned nanotubes. 6,7 Zeolite membranes, on the other hand, possess three--dimensional networks that can effectively reject salt ions 8 but show relatively low water permeability. 9 Recently, nanoporous one--atom--thick graphene, the thinnest possible membrane made from matter, has drawn considerable attention and been shown computationally to provide significantly enhanced permeability compared to polyamide while maintaining excellent ability to reject salt. 10 Moreover, recent work of Surwade et al. has further experimentally realized such single--layered nanoporous graphene membranes and demonstrated their potential in desalination at the lab scale. 11 However, the production of nanoporous graphene membranes with perfectly sized nanopores still remains a great challenge. Moreover, to allow unprecedentedly high water fluxes, it is of great importance to achieve a pore density as high as possible while preventing pores from overlapping, a goal best achieved with a well--ordered pore structure. Seeking membranes with naturally ordered pores of an ideal size presents an important alternative to nanoporous graphene m...

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Mechanical Properties of Monolayer Graphene Oxide

Cited by 1,067 publications

References 60 publications

Evaporation induced wrinkling of graphene oxide at the nanoparticle interface

Evaporation induced wrinkling of graphene oxide at the nanoparticle interface

One-Step Synthesis of Graphene Oxide–Polyamidoamine Dendrimer Nanocomposite Hydrogels by Self-Assembly

Two-dimensional covalent triazine framework as an ultrathin-film nanoporous membrane for desalination

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