Laser modification of graphene oxide layers

Malínský, P.; Macková, Anna; Cutroneo, M.; Siegel, Jakub; Boháčová, Marie; Klímová, Kateřina; Švorčı́k, Václav; Sofer, Zdeněk

doi:10.1051/epjconf/201816704010

Cited by 8 publications

(3 citation statements)

References 33 publications

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“…These experimental evidences are reported in the experimental data of Figure a, for the KrF excimer laser at low fluence, and Figure 5b, for the Nd:Yag laser at high fluence, respectively, in agreement with the literature. [ 21,22 ] In the first case, the roughness decreases to about 200 nm using a fluence of 12 mJ cm −2 , while in the second case, the irradiation at high energy, inducing not only partial surface ablation but also exfoliation processes, increases the roughness up to 2.5 μm at the 600 mJ cm −2 fluence.…”

Section: Resultsmentioning

confidence: 99%

Measurements on Five Characterizing Properties of Graphene Oxide and Reduced Graphene Oxide Foils

Torrisi

Cutroneo

Torrisi

et al. 2022

Physica Status Solidi (a)

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Graphene (G) is a thin graphite sheet consisting of sp 2 carbon atoms disposed in a hexagonal structure. [1] Single or multiple graphene sheet can be obtained exfoliating graphite and generating graphene oxide (GO). [2] Lastly, this has interesting properties that are strongly influenced by the oxygen functional groups arranged on its surface and edges. GO contains functional oxygen groups such as hydroxyl and epoxy groups attached on the basal plane and carboxyl, carbonyl, and phenol groups at the edges. [3] GO has peculiar properties as mechanical flexibility, low solubility, high electrical resistivity, low optical absorbance in the near IR region, and high hydrophilic behavior, which permits good adherence to other materials and possibility to prepare complex composite structures. [1,4] Although mechanically less resistant than graphene, graphene oxide has advantages with respect to graphene, it is commercially cheap and available in large quantities, easier to exfoliate, and adapt to realize many types of composites especially coupled with different polymers. [4] The actual state of art concerning GO properties indicates that it can be modified drastically reducing the functional oxygen groups. Depending on the level of reduction, the resulting reduced graphene oxide (rGO) is electrically conductive, mechanically more resistant than GO, it has high absorbance in the near IR region, and higher density and hydrophobic properties. [5,6] The chemical and physical properties of GO and rGO depend on the amount of the functional groups bonded to the graphene platelets and of the coupled materials in the case of composite structures. [3] Such matter has found many applications in different fields, so as Biology and Medicine, microelectronics, environment, matter structure, engineering, nuclear Physics, Chemistry, and others.The low cytotoxicity of such materials, high biocompatibility, and hemocompatibility make them suitable for use as medical prosthesis, biocompatible nanoparticles, plan for cell cultures, and others. [7] The high-energy gap of GO and its controllable reduction in rGO and the high electrical conductivity of G permit to realize microelectronic devices such as field effect transistors (FET), light emitter diodes, radiation detectors, supercapacitors, and micrometric conductive tracks. [8,9] The use of G and GO as membranes permits to filter solution separating the solute from the solvent, producing desalination of sea water and eliminating pollutants from rivers and lakes. [10] The G, GO, and rGO nanoparticles inclusion in other materials determines physical and chemical modifications of the matrix, such as mechanical, optical, and electrical properties. [11] Transparent polymers become opaque also using less than the 0.1% concentration of graphene-based nanoparticles. Engineering is using graphene-based material to build light and resistant foils to be employed in aeronautical, naval, and automotive handling. [12] Nuclear Physicists are using these materials as ion strippers in accelerators, as sen...

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Section: Resultsmentioning

confidence: 99%

Measurements on Five Characterizing Properties of Graphene Oxide and Reduced Graphene Oxide Foils

Torrisi

Cutroneo

Torrisi

et al. 2022

Physica Status Solidi (a)

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“…The G band is attributed to the in-plane stretching motion of sp 2 -bonded carbon atoms in the graphene monolayer. 33 The D band originates from structural defects, edge effects and the appearance of dangling sp 2 bonds. 33 The 2D band is an overtone of the D band 34 (this peak can be seen even in defectfree graphene).…”

Section: Resultsmentioning

confidence: 99%

“…33 The D band originates from structural defects, edge effects and the appearance of dangling sp 2 bonds. 33 The 2D band is an overtone of the D band 34 (this peak can be seen even in defectfree graphene). In MC-G-300, a D' band 35 is seen at 1610 cm −1 in addition to the G band and D band.…”

Section: Resultsmentioning

confidence: 99%

Oxygen Reduction/Evolution Activity of a Mechanochemically Synthesized Multilayer Graphene

Yuasa¹,

Tanaka²,

Shimizu³

et al. 2021

J. Electrochem. Soc.

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Multilayer graphenes were synthesized by a mechanochemical treatment of commercial graphite powder and studied as an air electrode for metal-air batteries. The mechanochemical treatment of the commercial graphite powder was performed for 2h using a planetary ball mill apparatus with large stainless steel balls (10 mm diameter) that did not require the aid of solvents. As a result, multilayer graphenes were successfully obtained when the rotational speed of the planetary ball mill was 500 rpm or more. Raman spectroscopy revealed that the resulting multilayer graphenes contains many defects, while electrochemical measurements revealed that this multilayer graphene has high stability against anodic corrosion. Moreover, a higher bifunctional ORR/OER activity was observed for this material than other bifunctional ORR/OER materials, such as LaNiO3 and multilayer graphene synthesized by a modified Hummer’s method. This excellent electrochemical performance implies that the mechanochemically synthesized multilayer graphenes with high stability and high bifunctional ORR/OER activity obtained in this study can be an excellent alternative to carbon black, which is conventionally used for air electrode materials.

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Effect of hydrothermal treatment and LaMnO3 loading on the oxygen reduction activity of chitosan-derived carbon-based gas diffusion electrodes

et al. 2022

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Laser modification of graphene oxide layers

Cited by 8 publications

References 33 publications

Measurements on Five Characterizing Properties of Graphene Oxide and Reduced Graphene Oxide Foils

Measurements on Five Characterizing Properties of Graphene Oxide and Reduced Graphene Oxide Foils

Oxygen Reduction/Evolution Activity of a Mechanochemically Synthesized Multilayer Graphene

Effect of hydrothermal treatment and LaMnO3 loading on the oxygen reduction activity of chitosan-derived carbon-based gas diffusion electrodes

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