A modified Marcano method for improving electrical properties of reduced graphene oxide (rGO)

Husnah, Miftahul; Fakhri, Hafizh A.; Rohman, Fadli; Aimon, Akfiny Hasdi; Iskandar, Ferry

doi:10.1088/2053-1591/aa707f

Cited by 40 publications

(21 citation statements)

References 17 publications

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“…Specifically, all three samples exhibit almost the same diffraction peaks, except an extra peak at the smallest angle (2θ = 12.0°) for G α‑CD . According to previous studies, the peak at around 44° corresponds to (100) or (101) plane with a distance ∼0.205 nm. , Another peak at 2θ = 22.8° indicates a d -spacing of 0.387 nm calculated by the Bragg equation. It is well established that the interlayer distance of graphene in graphite is ∼0.34 nm, and the distance increases in the case of nonideal graphenes. , Therefore, the peak position at 22.8° should be ascribed to the interlayer diffraction of G CD , and it can be speculated that all the G CD samples are slightly oxidized, which is also consistent with combustion chemical analysis and XPS data.…”

Section: Resultsmentioning

confidence: 71%

“…According to previous studies, the peak at around 44°corresponds to (100) or (101) plane with a distance ∼0.205 nm. 25,26 Another peak at 2θ = 22.8°i ndicates a d-spacing of 0.387 nm calculated by the Bragg equation. It is well established that the interlayer distance of graphene in graphite is ∼0.34 nm, and the distance increases in the case of nonideal graphenes.…”

Section: Resultsmentioning

confidence: 87%

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Photocatalytic Overall Water Splitting Activity of Templateless Structured Graphitic Nanoparticles Obtained from Cyclodextrins

Peng

Rendón‐Patiño

Franconetti

et al. 2020

ACS Appl. Energy Mater.

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Pyrolysis of α-, β-, and γ-cyclodextrins at 900 °C under Ar forms porous 3D graphitic carbon nanoparticles with remarkable crystallinity, in which the pore dimensions range from 0.74 to 1.1 nm in the ultra/micropore range as determined by N2, Ar, and CO2 adsorption. These materials behave as semiconductors with the potential energy of the conduction and valence bands being remarkably dependent in as much as 0.57 eV on the dimensions of the micropores. The photogeneration of electrons and holes was confirmed by photodeposition of Pt (electrons) and PbO2 (holes) nanoparticles by reduction and oxidation, respectively. Importantly, these 3D porous graphitic carbons generate H2 and O2 from H2O in the absence of any metal cocatalyst. Theoretical calculations at the DFT level confirm in models the influence of the dimensions of the pores, the presence of defects, and residual oxygen on the band energy and that the occurrence of H2O dissociation is favored inside the pores by a confinement effect. Considering the interest in developing metal-free photocatalyst, the present results show the possibility to tune the band alignment of porous carbon semiconductors by appropriate selection of precursors and the convenient generation of defects.

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Section: Resultsmentioning

confidence: 71%

Section: Resultsmentioning

confidence: 87%

Photocatalytic Overall Water Splitting Activity of Templateless Structured Graphitic Nanoparticles Obtained from Cyclodextrins

Peng

Rendón‐Patiño

Franconetti

et al. 2020

ACS Appl. Energy Mater.

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“…G and GO peaks on the aged surface indicate the higher substrate bond strength of the GO-Cu composite coating. However, the small peak around 2θ ∼ 20° indicate that some of the GO has converted to rGO. , Interestingly, XRD of GO-Cu surface after the first pool boiling run showed a small bump around 2θ ∼ 20° indicating that some of GO has reduced to rGO. The continuous repetitive pool boiling further converts more of GO to rGO.…”

Section: Resultsmentioning

confidence: 99%

Repetitive Pool Boiling Runs: A Controlled Process to Form Reduced Graphene Oxide Surfaces from Graphene Oxide with Tunable Surface Chemistry and Morphology

Rishi

Kandlikar

Gupta

2019

Ind. Eng. Chem. Res.

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Wettability and wickability of a surface are the key properties that govern a variety of industrial applications. Understanding the effect of aging on the durability of these surfaces and subsequent changes occurring in their molecular structure is vital to maintain functionality. In this work, we used repetitive pool boiling to test the durability of graphene oxide-copper (GO-Cu) coated surfaces and studied subsequent changes in surface chemistry and morphology. We observed the transformation of GO-Cu to reduced GO-copper (rGO-Cu) coating that led to improved boiling performance. This improvement is attributed to (a) transition of hydrophilic GO to hydrophobic rGO due to the repetitive pool boiling, (b) increased surface roughness as a result of hydrophobic surfaces , and c) increased surface inhomogeneity due to the presence of three elements-carbon, oxygen and copper. The durability of the GO-Cu coatings was found to be higher than pristine-copper and just-copper coated surfaces. A higher performance demonstrated by GO-Cu coatings indicates its increased sustainability and practicability in numerous engineering applications.

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“…Sintesis GO dilakukan dengan memodifikasi metode Hummer [11]. Disiapkan campuran H2SO4/H3PO4 dengan dengan perbandingan (9:1) sebanyak 40 mL dan ditambahkan 2 g serbuk grafit dari baterai bekas.…”

Section: Sintesis Graphene Oxideunclassified

“…Karakteristik puncak tersebut menunjukan bahwa proses reduksi menggunakan hydrazine hydrate telah berhasil dilakukan. Hasil spektrum karakterisitik puncak rGO yang diperoleh sesuai dengan penelitian [11][18] [21]. Spektrum TiO2-rGO menunjukan karakteristik puncak 2θ = 25,1°, 37,6°, 47,9°, 54,9°, dan 62,5°, dengan jarak antar kisi masing-masing 0,35 nm, 0,23 nm, 0,18 nm, 0,16 nm, dan 0,14 nm.…”

Section: Karakterisasi Xrdunclassified

Sintesis Titanium Oksida/Reduced Graphene Oxide (TiO2/rGO) untuk Fotokatalisis Bahan Pewarna Metilen Biru

2021

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Metilen biru (MB) merupakan bahan pewarna tekstil yang banyak digunakan di industri. Fotokatalisis dapat digunakan untuk mendegradasi struktur senyawa MB yang kompleks tersebut. Faktor penting dalam fotokatalisis adalah peran dari katalis, dalam hal ini. reduced graphene oxide (rGO) telah berhasil disintesis dengan memodifikasi metode Hummer. Reduced graphene oxide dikompositkan dengan titanium oksida (TiO2) karena orbital d-π pada TiO2–rGO akan saling tumpang tindih sehingga eksitasi elektron dapat terjadi secara berulang untuk menekan rekombinasi saat fotokatalisis TiO2 dan meningkatkan efektifitas fotokatalisis dalam mendegradasi metilen biru. Reduced graphene oxide dibuat dengan cara mereduksi gugus oksida pada graphene oxide (GO) menggunakan hydrazine hydrate. Difraktogram XRD menunjukan karakteristik puncak GO pada 2θ = 10,3° dan 26,4° serta rGO pada 2θ = 26,4°. Fotokatalisis dilakukan pada MB dengan katalis TiO2, dan TiO2–rGO, dengan rentang waktu 0, 30, 60, 90, 120 menit. Hasil fotokatalisis TiO2–rGO terbukti lebih baik dari TiO2 dalam mendegrasi MB, dengan efisiensi degradasi TiO2–rGO adalah 85,38%, dan TiO2 sebesar 72,49%.

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A modified Marcano method for improving electrical properties of reduced graphene oxide (rGO)

Cited by 40 publications

References 17 publications

Photocatalytic Overall Water Splitting Activity of Templateless Structured Graphitic Nanoparticles Obtained from Cyclodextrins

Photocatalytic Overall Water Splitting Activity of Templateless Structured Graphitic Nanoparticles Obtained from Cyclodextrins

Repetitive Pool Boiling Runs: A Controlled Process to Form Reduced Graphene Oxide Surfaces from Graphene Oxide with Tunable Surface Chemistry and Morphology

Sintesis Titanium Oksida/Reduced Graphene Oxide (TiO2/rGO) untuk Fotokatalisis Bahan Pewarna Metilen Biru

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