Selected Papers from the 1st International Online Conference on Nanomaterials

Díez‐Pascual, Ana M.; Chen, Guanying

doi:10.3390/nano9071021

Cited by 3 publications

(4 citation statements)

References 18 publications

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“…The d-spacing calculated for the reference GO is 0.8615 nm, about 2.6-fold bigger than the calculated for graphite. This increase in the d-spacing is consistent with previous works [37], which is accredited to the presence of oxygen containing groups, mainly epoxide and hydroxyl formed during the oxidation process, laying between the GO sheets, and a change in the hybridization state of the C atoms from sp 2 to sp 3 [54]. The values of d-spacing calculated for all the EGOs are listed in Table 1.…”

Section: X-ray Diffraction Study Of the Egossupporting

confidence: 89%

“…Graphene oxide (GO), which is the oxidized form of graphene, is currently attracting a lot of interest due to its unique chemical, optical, and electronic properties that make it suitable for a broad range of uses including supercapacitors, solar cells, fuel cells, lithium batteries, biomedicine, polymer nanocomposites, and more [1][2][3][4][5][6]. It presents several surface oxygen-containing groups, mainly COOH moieties on the layer edges as well as C-O-C and OH on the basal planes (Scheme 1).…”

Section: Introductionmentioning

confidence: 99%

“…Many modifications of these approaches, especially of the Hummer's one, have been published, with enhancements being constantly investigated to attain improved results at a lower cost. For example, strategies without NaNO 3 in order to avoid the formation of toxic gasses (NO 2 /N 2 O 4 ) and to make the disposal of waste water easier due to the absence of Na + and NO 3 − ions have been reported [20]. GO can also be prepared from graphite oxide by means of sonication, stirring, or even by rapid freezing of an aqueous solution containing the parent oxide, which is followed by thawing of the resulting solid [21].…”

Section: Introductionmentioning

confidence: 99%

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Tailorable Synthesis of Highly Oxidized Graphene Oxides via an Environmentally-Friendly Electrochemical Process

et al. 2020

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Graphene oxide (GO) is an attractive alternative to graphene for many applications due to its captivating optical, chemical, and electrical characteristics. In this work, GO powders with a different amount of surface groups were synthesized from graphite via an electrochemical two-stage process. Many synthesis conditions were tried to maximize the oxidation level, and comprehensive characterization of the resulting samples was carried out via elemental analysis, microscopies (TEM, SEM, AFM), X-ray diffraction, FT-IR and Raman spectroscopies as well as electrical resistance measurements. SEM and TEM images corroborate that the electrochemical process used herein preserves the integrity of the graphene flakes, enabling to obtain large, uniform and well exfoliated GO sheets. The GOs display a wide range of C/O ratios, determined by the voltage and time of each stage as well as the electrolyte concentration, and an unprecedented minimum C/O value was obtained for the optimal conditions. FT-IR evidences strong intermolecular interactions between neighbouring oxygenated groups. The intensity ratio of D/G bands in the Raman spectra is high for samples prepared using concentrated H2SO4 as an electrolyte, indicative of many defects. Furthermore, these GOs exhibit smaller interlayer spacing than that expected according to their oxygen content, which suggests predominant oxidation on the flake edges. Results point out that the electrical resistance is conditioned mostly by the interlayer distance and not simply by the C/O ratio. The tuning of the oxidation level is useful for the design of GOs with tailorable structural, electrical, optical, mechanical, and thermal properties.

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Section: X-ray Diffraction Study Of the Egossupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tailorable Synthesis of Highly Oxidized Graphene Oxides via an Environmentally-Friendly Electrochemical Process

et al. 2020

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“…Lately, considerable interest has been directed to graphene (G) and its derivatives including graphene oxide (GO). This oxidized form of graphene with several surface oxygen-containing groups such as epoxides, alcohols, and carboxylic acids is currently being used in a wide number of applications such as batteries, electrical cells, nanocomposites, besides to gain importance in biomedicine [ 1 , 2 , 3 , 4 , 5 , 6 ]. The greatest interest in GO over G could be explained by its higher possibilities to achieve functional properties since it is feasible to tailor its functionalities through reduction and functionalization processes [ 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Graphene Oxides Derivatives Prepared by an Electrochemical Approach: Correlation between Structure and Properties

et al. 2020

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Graphene oxide (GO) can be defined as a single monolayer of graphite with oxygen-containing functionalities such as epoxides, alcohols, and carboxylic acids. It is an interesting alternative to graphene for many applications due to its exceptional properties and feasibility of functionalization. In this study, electrochemically exfoliated graphene oxides (EGOs) with different amounts of surface groups, hence level of oxidation, were prepared by an electrochemical two-stage approach using graphite as raw material. A complete characterization of the EGOs was carried out in order to correlate their surface topography, interlayer spacing, defect content, and specific surface area (SSA) with their electrical, thermal, and mechanical properties. It has been found that the SSA has a direct relationship with the d-spacing. The EGOs electrical resistance decreases with increasing SSA while rises with increasing the D/G band intensity ratio in the Raman spectra, hence the defect content. Their thermal stability under both nitrogen and dry air atmospheres depends on both their oxidation level and defect content. Their macroscopic mechanical properties, namely the Young’s modulus and tensile strength, are influenced by the defect content, while no correlation was found with their SSA or interlayer spacing. Young moduli values as high as 54 GPa have been measured, which corroborates that the developed method preserves the integrity of the graphene flakes. Understanding the structure-property relationships in these materials is useful for the design of modified GOs with controllable morphologies and properties for a wide range of applications in electrical/electronic devices.

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Optimization of remedial nano-agent and its effect on dominant algal species succession in eutrophic water body

Fan

Chen

Xia

et al. 2021

Journal of Environmental Management

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Selected Papers from the 1st International Online Conference on Nanomaterials

Abstract: After decades of intense research, nanomaterials are now an integral part of many applications and enjoy the attention of a large research community [...]

Cited by 3 publications

References 18 publications

Tailorable Synthesis of Highly Oxidized Graphene Oxides via an Environmentally-Friendly Electrochemical Process

Tailorable Synthesis of Highly Oxidized Graphene Oxides via an Environmentally-Friendly Electrochemical Process

Graphene Oxides Derivatives Prepared by an Electrochemical Approach: Correlation between Structure and Properties

Optimization of remedial nano-agent and its effect on dominant algal species succession in eutrophic water body

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