Production of aqueous dispersions of inorganic graphene analogues by exfoliation and stabilization with non-ionic surfactants

Guardia, L.; Paredes, J.I.; Rozada, R.; Villar–Rodil, S.; Martı́nez-Alonso, A.; Tascón, J.M.D.

doi:10.1039/c4ra00212a

Cited by 108 publications

(114 citation statements)

References 59 publications

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“…In N 2 the concentration of carboxylic compounds are always low, the only organic anion identified in traces is the acetate ion which is released in solution during the first irradiation days, presumably as a consequence of the GO photo-reduction process which releases in solution carboxylic moieties formed on the graphenic structure during the oxidation step. The release of gaseous species as a consequence of the irradiation of film or suspension of GO was previously reported [26,28,30]. In particular Shulga and co-workers [28] observed the release of CO, CO 2 , H 2 O and O 2 during the irradiation of GO films, with a main production of CO in the first steps of irradiation and a progressive and continued accumulation of CO 2 .…”

Section: -Sm)mentioning

confidence: 93%

“…The qualitative and semi-quantitative study of the nature and concentration of oxidized moieties in the structure of the synthesized GO was carried out recording the ATR-FTIR spectra of GO collected on 0.45 μm filtering membrane (note that the thickness of the GO analyzed films masked totally the FTIR signals of the membrane). Fig.3 shows the recorded spectra in which the peculiar vibrational signals of oxygen-containing groups typical of GO structures are manifest [26][27][28]. A summary of the recorded peak signals and their attribution are summarized in Table 1 …”

Section: Go Suspension Characterization (Different Oxidation Time)mentioning

confidence: 99%

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Photochemical stability and reactivity of graphene oxide

et al. 2015

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The photoreactivity of graphene oxide (GO) suspensions was investigated with a double aim: i) to give insights into the previously reported photo-reduction process, which allows a partial elimination of the oxygen-containing groups from the 2D graphitic structure; ii) to explore the possible use of GO as photo-activator able to promote the photo-transformation/abatement of organic molecules. To reach these goals and clarify some peculiar aspects of the photochemistry of GO till now obscure or confuse, we synthesized and characterized stable GO suspensions which were then subjected to UV-Vis irradiation for prolonged times. GO underwent partial photoreduction with the release of gaseous molecules and soluble organic species (e.g. carboxylic acid).The mechanisms of photo-reduction occurring under air or N 2 are different, as assessed by the release in solution of diverse soluble molecules. In the presence of oxygen, at long irradiation time, a complete solubilization of the graphenic structures was observed. No difference in the nature and amount of released gases (principally CO 2 and CO) was observed in the oxic or anoxic conditions.The possible use of GO as photo-activator was evaluated by using phenol as probe molecule. GO revealed a double role of photo-activator and reagent in phenol degradation, as competition was assessed between GO self-transformation/reduction and phenol degradation. At prolonged irradiation time a marked reactivity of the photoformed species was observed and the complete degradation was achieved for both organic small molecules formed from GO and the phenol added as probe molecule.

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Section: -Sm)mentioning

confidence: 93%

Section: Go Suspension Characterization (Different Oxidation Time)mentioning

confidence: 99%

Photochemical stability and reactivity of graphene oxide

et al. 2015

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“…54,103,112 In addition, some top-down approaches can be carried out in aqueous media, which eliminates the need for environmentally unfriendly organic solvents. 109,117–122 Consequently, aqueous and biocompatible synthesis and processing have become increasingly important for the application of 2D materials in biomedical contexts.…”

Section: D Materials Synthesis Methods That Impact Hazard Potentialmentioning

confidence: 99%

Assessing and Mitigating the Hazard Potential of Two-Dimensional Materials

Guiney¹,

Wang

Xia

et al. 2018

ACS Nano

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The family of two-dimensional (2D) materials is comprised of a continually expanding palette of unique compositions and properties with potential applications in electronics, optoelectronics, energy capture and storage, catalysis, and nanomedicine. To accelerate the implementation of 2D materials in widely disseminated technologies, human health and environmental implications need to be addressed. While extensive research has focused on assessing the toxicity and environmental fate of graphene and related carbon nanomaterials, the potential hazards of other 2D materials have only recently begun to be explored. Herein, the toxicity and environmental fate of post-carbon 2D materials, such as transition metal dichalcogenides, hexagonal boron nitride, and black phosphorus, are reviewed as a function of their preparation methods and surface functionalization. Specifically, we delineate how the hazard potential of 2D materials is directly related to structural parameters and physicochemical properties, and how experimental design is critical to the accurate elucidation of the underlying toxicological mechanisms. Finally, a multidisciplinary approach for streamlining the hazard assessment of emerging 2D materials is outlined, thereby providing a pathway for accelerating their safe use in a range of technologically relevant contexts.

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“…Generally, graphene and the corresponding mimics, particularly the layered TMDCs, can be obtained by several means involving top-down and bottom-up approaches. Besides chemical vapor deposition (CVD) [10,11], liquid exfoliation, electrochemical exfoliation, lithium assisted intercalation and exfoliation [12], solvothermal/hydrothermal methods as well as microwave synthesis [13,14] have been successfully applied for generating graphene and its analog, namely MoS 2 [12,[15][16][17][18]19].…”

Section: Structural Aspects and Synthesis Methodologiesmentioning

confidence: 99%

Graphene and molybdenum disulfide hybrids: synthesis and applications

et al. 2015

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Graphene and related inorganic two-dimensional (2D) nanomaterials are an exceptional class of compounds with exotic properties that are technologically intriguing. While graphene itself is chemically inert and a gapless semimetal, its isostructural analog, molybdenum disulfide (MOS 2 ) is chemically versatile with band gaps, thereby finding significant use in a myriad of applications. Although these 2D nanomaterials individually possess tremendous authority for various applications, the combination of these materials in the recent past has created a new paradigm in emerging applications. Here, we summarize the current state-of-the-art and progress over the past three years on the development of hybrids of these layered materials. We highlight their pivotal role in electrochemical energy storage, sensing, hydrogen generation by photochemical water splitting and electronic device applications such as field-effect transistors. Perspectives on the challenges and opportunities for the exploration of these 2D layered hybrid materials are put forward.

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Production of aqueous dispersions of inorganic graphene analogues by exfoliation and stabilization with non-ionic surfactants

Abstract: The production of stable aqueous suspensions of several inorganic graphene analogues was performed by exfoliation of the corresponding bulk layered materials via sonication using non-ionic surfactants as dispersing agents.

Cited by 108 publications

References 59 publications

Photochemical stability and reactivity of graphene oxide

Photochemical stability and reactivity of graphene oxide

Assessing and Mitigating the Hazard Potential of Two-Dimensional Materials

Graphene and molybdenum disulfide hybrids: synthesis and applications

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