Drop-Casted Self-Assembling Graphene Oxide Membranes for Scanning Electron Microscopy on Wet and Dense Gaseous Samples

Krueger, Mark; Berg, Shannon; Stone, D. S.; Strelcov, Evgheni; Dikin, Dmitriy A.; Kim, Jaemyung; Cote, Laura J.; Huang, Jiaxing; Kolmakov, Andrei

doi:10.1021/nn204287g

Cited by 117 publications

(81 citation statements)

References 41 publications

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“…3.4 ) [ 123 ]. An ionic liquid (1-(3-aminopropyl)-3-methylmidazolium bromide, RNH 2 ) was attached to GO via the end amine group in a nucleophilic attack of the epoxy groups [ 124 ]. Another example involved 3-aminopropyltriethoxysilane (APTS) attachment onto epoxy via a S N 2 reaction and of course ring opening of epoxy groups, while reinforcement in the mechanical properties of the resulted silica composite was demonstrated [ 125 ].…”

Section: Covalentmentioning

confidence: 99%

The Chemistry of Graphene Oxide

2015

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In this chapter, we discuss a variety of chemical reactions introduced for GO. Among all studies on the chemistry of GO, the largest portion focused on the reduction of GO back to graphene, mainly due to its high relevance to graphene and the gold rush of graphene research over the last decade. However, doping, functionalization and cross-linking of GO are equally, if not more, interesting to chemists, since GO is a giant model compound of polycyclic aromatic hydrocarbon (PAH) oxides. Here, we start with a thorough comparison between various reducing recipes for GO, and follow with some theoretical simulations and predictions on its convertibility toward graphene. In addition to that, we elaborate on extended chemical modifi cations (covalent and non-covalent), cross-linking, and doping recipes for this macromolecule shown in literature. After all, we intend to show you that GO became a relatively hot research topic, not only due to its relevance to graphene, but also for its high chemical activity and tunability, which enabled the prosperity of its research in various fi elds led by chemists, materials scientists, biologists, physicists, as well as engineers. It is a perfect paradigm for young researchers as an important subject thrived in interdisciplinary research. After all, when real-life problems come, potential solutions do not impose boundaries between disciplines. All relevant disciplines can offer their input, and contribute together to the fi nal solutions, in which cases communications and collaborations between different researchers need to be encouraged and appreciated.

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Section: Covalentmentioning

confidence: 99%

The Chemistry of Graphene Oxide

2015

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“…22,45 As for drop coating and spray coating, the main process of thin GO lm formation is dripping or spraying GO dispersion on horizontal substrates and drying aerward. 68 Gilje et al 69 spray-coated GO onto SiO 2 substrate in which the prepared GO lm is more uniform than that of drop-coating. Then, they chemical reduced the GO lm with hydrazine at 80 C. Dip coating is another traditional lm preparation method, in which the substrate should be withdrawn vertically from the container.…”

Section: (C)mentioning

confidence: 99%

Separation and purification using GO and r-GO membranes

et al. 2018

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Many materials with varied characteristics have been used for water purification and separation applications. Recently discovered graphene oxide (GO), a two-dimensional derivative of graphene has been considered as a promising membrane material for water purification due to its excellent hydrophilicity, high water permeability, and excellent ionic/molecular separation properties. This review is focussed on the possible versatile applicability of GO membranes. It is also known that selective reduction of GO results in membranes with a pore size of $0.35 nm, ideally suited for desalination applications. This article presents the applicability of graphene-based membranes for multiple separation applications. This is indeed the first review article outlining a comparison of GO and r-GO membranes and discussing the suitability for applications based on the porosity of the membranes.

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“…rGO could be synthesized in large quantities from inexpensive reagents using simple chemical approaches. 20 It readily exfoliates to thin sheets in water, segregates at the water-air interface upon solvent evaporation, 21 and could be easily processed into continuous paper-like lms. 22,23 Properties of rGO, such as conductivity, tensile strength, etc., strongly depend on the degree of GO reduction, 24,25 which means that they could be nely tuned by the reduction conditions.…”

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confidence: 99%