Controlling covalent chemistry on graphene oxide

Guo, Shi; Garaj, Slaven; Bianco, Alberto; Ménard‐Moyon, Cécilia

doi:10.1038/s42254-022-00422-w

Cited by 138 publications

(86 citation statements)

References 150 publications

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“…Film organization at interfaces combines confined water properties with a self-organized microenvironment. 26 GO flakes, usually derived via chemical or physical exfoliation of graphite, 27 are two-dimensional and can be effectively pinned on top of a liquid subphase. 28 Because GO is also soluble in water, creating interfacial thin films is not trivial and various methods have been proposed.…”

Section: Introductionmentioning

confidence: 99%

Convenient Confinement: Interplay of Solution Conditions and Graphene Oxide Film Structure on Rare Earth Separations

Carr

Lee

Kumal

et al. 2022

Preprint

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Graphene oxide (GO) membranes are excellent candidates for a range of applications, including rare earth separations and radionuclide decontamination. Membrane performance varies widely under different conditions, as water and ion interactions with the membrane are strongly affected by small system changes. Feed solution pH is one critical factor, as pH, GO surface functionality, and ion speciation are interconnected parameters that cannot be controlled individually. Understanding nanoscale water and ion behavior near interfacial GO is critical for groundbreaking membrane advances, including improved selectivity and permeability. We experimentally examine the impact of solution conditions on water and lanthanide interactions with self-assembled GO films and connect these results to GO membrane performance. The investigation of the confined films at the air-water interface with a combination of surface-specific spectroscopy and X-ray scattering techniques allows us to understand water and ion behaviors separately. Sum frequency generation spectroscopy reveals a dramatic change in interfacial water organization because of graphene oxide film deprotonation. Interfacial X-ray fluorescence measurements show a 17x increase in adsorbed lanthanide to the GO film from subphase pH 3 to pH 9. Liquid surface X-ray reflectivity data show an additional 2.7 e- per Å2 for GO films at pH 9 versus pH 3 as well. These data are connected to GO membrane performance, which show increased selectivity and decreased flux for membranes filtering pH 9 solutions. We posit insoluble lanthanide hydroxides form at higher pHs. Take together, these results highlight the importance of interfacial experiments on model GO systems.

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Section: Introductionmentioning

confidence: 99%

Convenient Confinement: Interplay of Solution Conditions and Graphene Oxide Film Structure on Rare Earth Separations

Carr

Lee

Kumal

et al. 2022

Preprint

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show abstract

“…The lighter the molecule, the more the vibration frequency and the higher the wavenumber [40]. Moreover, the appearance of C≡C functional group of alkyne at wavenumber of 2117.1 cm -1 in all the synthesized nanocomposites is an indication that the used GO is an alkynefunctionalized one [41].…”

Section: Fourier Transform Infra-red (Ftir) Spectroscopic Analysismentioning

confidence: 84%

THE CHEMICAL SYNTHESIS AND CHARACTERIZATION OF COBALT (Co), NICKEL (Ni) AND COPPER (Cu) NITROGEN-DOPED GRAPHENE NANOCOMPOSITES

Shuaibu¹,

Audu²

2022

JCSN

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Nitrogen-doped graphene (NGr) and metal nitrogen-doped graphene nanocomposites (MNGr) were synthesized employing chemical reduction method. The synthesized nanocomposites and graphene oxide (GO) were characterized via conventional characterization techniques. UV-Vis spectra of the synthesized metal nanocomposites indicated that cobalt (Co), nickel (Ni) and (Cu) copper nanoparticles (NPs) exhibited surface plasmon resonance peaks at 515 nm, 230 nm and 770 nm respectively, indicating the formation of the respective metal nanoparticles (MNPs) on NGr. The EDXRF analysis showed that the synthesized nanocomposites of the metals are very pure. SEM indicated the appearance of wrinkles and crumples, confirming the structural morphology of NGr. It also showed the attachment of smaller and white spherically shaped spots with insubstantial aggregation of MNPs on NGr. FTIR analysis showed the C=C stretching frequency in the GO that has shifted to a higher wavenumber from 1632.6-1640 cm- 1, indicating successful reduction of the nanocomposites. XRD analysis revealed the presence of the face-centred cubic crystalline lattices (fcc) for Ni, Co and Cu nanoparticles. The Scherrer equation was used to calculate the mean particle sizes of the MNPs formed on the NGr support.

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“…During reduction, the majority of the functional groups that contain oxygen in GO, such as carboxylic, hydroxyl and carbonyl, are removed. However, it is still impossible to completely reduce GO to synthesize pure graphene [ 49 ]. The resultant rGO is often quite similar to pure graphene, albeit with certain flaws and size variations.…”

Section: Techniques For the Production Of Graphenementioning

confidence: 99%

Graphene and Its Derivatives: Synthesis and Application in the Electrochemical Detection of Analytes in Sweat

et al. 2022

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Wearable sensors and invasive devices have been studied extensively in recent years as the demand for real-time human healthcare applications and seamless human–machine interaction has risen exponentially. An explosion in sensor research throughout the globe has been ignited by the unique features such as thermal, electrical, and mechanical properties of graphene. This includes wearable sensors and implants, which can detect a wide range of data, including body temperature, pulse oxygenation, blood pressure, glucose, and the other analytes present in sweat. Graphene-based sensors for real-time human health monitoring are also being developed. This review is a comprehensive discussion about the properties of graphene, routes to its synthesis, derivatives of graphene, etc. Moreover, the basic features of a biosensor along with the chemistry of sweat are also discussed in detail. The review mainly focusses on the graphene and its derivative-based wearable sensors for the detection of analytes in sweat. Graphene-based sensors for health monitoring will be examined and explained in this study as an overview of the most current innovations in sensor designs, sensing processes, technological advancements, sensor system components, and potential hurdles. The future holds great opportunities for the development of efficient and advanced graphene-based sensors for the detection of analytes in sweat.

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Controlling covalent chemistry on graphene oxide

Cited by 138 publications

References 150 publications

Convenient Confinement: Interplay of Solution Conditions and Graphene Oxide Film Structure on Rare Earth Separations

Convenient Confinement: Interplay of Solution Conditions and Graphene Oxide Film Structure on Rare Earth Separations

THE CHEMICAL SYNTHESIS AND CHARACTERIZATION OF COBALT (Co), NICKEL (Ni) AND COPPER (Cu) NITROGEN-DOPED GRAPHENE NANOCOMPOSITES

Graphene and Its Derivatives: Synthesis and Application in the Electrochemical Detection of Analytes in Sweat

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