Defect healing of reduced graphene oxide via intramolecular cross-dehydrogenative coupling

Park, Ok-Kyung; Choi, Yong-Mun; Hwang, Jun Yeon; Yang, Cheol‐Min; Kim, Tea-Wook; You, Nam‐Ho; Koo, Hye Young; Lee, Joong Hee; Ku, Bon‐Cheol; Goh, Munju

doi:10.1088/0957-4484/24/18/185604

Cited by 52 publications

(26 citation statements)

References 35 publications

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“…For N-rGO nanosheets, a significant weight loss occurs in the temperature range between 400 and 625 °C, due to the decomposition of N-rGO. The results are consistent with the previous reports suggested in the literature [25,26].…”

Section: Resultssupporting

confidence: 94%

Simple synthesis of nanosheets of rGO and nitrogenated rGO

Chithaiah¹,

Raju²,

Rao³

2020

Beilstein J. Nanotechnol.

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A green and facile approach has been developed for the large-scale synthesis of nanosheets of reduced graphene oxide (rGO) and nitrogenated reduced graphene oxide (N-rGO). This has been achieved by direct thermal decomposition of sucrose and glycine at 475 °C in ca. 7 minutes, respectively. The present protocols for synthesizing rGO and N-rGO are simple and environmentally friendly as we do not use any harmful reagents, metal catalysts and solvents. Along with that, this method offers an inexpensive route with high yields to prepare rGO with a high nitrogen content (20-25 atom %). To further improve the properties of the synthesized rGO sheets, hydrogen treatment has been carried out to reduce the oxygen functional groups. Cyclic voltammograms and charge-discharge experiments have been carried out to understand the supercapacitor behavior of rGO and hydrogen treated (H-rGO) samples. 68

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Section: Resultssupporting

confidence: 94%

Simple synthesis of nanosheets of rGO and nitrogenated rGO

Chithaiah¹,

Raju²,

Rao³

2020

Beilstein J. Nanotechnol.

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“…As the pH of the solution increases, the ratio in size between sp 2 and sp 3 hybridized carbon increases. This can be seen as the effective repairing of the graphitic lattice in the reduction process as the solution becomes more alkaline. This concurs with the I D /I G ratios from the Raman spectra where the ratio decreases as pH increases showing larger graphitic sp 2 domains and less disorder in more basic pH reduction environments.…”

Section: Resultssupporting

confidence: 91%

Effect of pH on the Reduction of Graphene Oxide on its Structure and Oxygen Reduction Capabilities in the Alkaline Media

Glass

Prakash

2018

Electroanalysis

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The reduction of many catalysts in aqueous media is usually carried out in a basic environment using most reducing agents. Graphene oxide (GO) was synthesized and reduced by sodium borohydride in an aqueous solution over a wide spectrum of pH values ranging from 1 to 13. X‐ray diffraction (XRD) and infrared spectroscopy (FTIR) confirmed the reduction of the graphene oxide at each respective pH value. Raman and X‐Ray photoelectron spectroscopy (XPS) spectra displayed an increased repair in the graphitic sp2 domain of the catalysts as the pH value of the solution was increased. Half‐cell electrochemical testing in basic media showed higher oxygen reduction capabilities in the catalysts that were reduced at higher pH values. The onset potential of the oxygen reduction reaction (ORR) also increased as the pH of the solution increased overall due to the increased repair in the graphitic domain of the catalysts reduced at higher pH values.

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“…The spectra clearly indicate a considerable degree of oxidation corresponding to carbon atoms in different functional groups: the non‐oxygenated ring C (284.6 eV) that includes CC bonds to make sp 2 hybridized carbon, the C in CO bonds (286.6 eV) that include hydroxyl and epoxy groups, and the C in CO bonds (288.0 eV) that include carbonyl groups 33, 34. A new peak (285.7 eV) arises after the reduction of GO, which is sp 3 hybridized carbon and includes CC bonds 35. The oxygen groups of GO were reduced substantially during the reduction reaction and heat treatment on substrate surface that successfully made RGO.…”

Section: Resultsmentioning

confidence: 99%

Amperometric Glucose Biosensor Based on Pt‐Pd Nanoparticles Supported by Reduced Graphene Oxide and Integrated with Glucose Oxidase

Hossain

Park

2014

Electroanalysis

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8 mM (R 2 = 0.997) and high sensitivity of 814 10 À6 A/ mMcm 2 . Furthermore, glucose oxidase with active material was integrated by a simple casting method on the RGO/PdPtNPs surface. The as-prepared biosensor showed good amperometric response to glucose in the linear range from 2 mM to 12 mM, with a sensitivity of 24 10 À6 A/mMcm 2 , a low detection limit of 0.001 mM, and a short response time (5 s). Moreover, the effect of interference materials, reproducibility and the stability of the sensor were also investigated.

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Defect healing of reduced graphene oxide via intramolecular cross-dehydrogenative coupling

Cited by 52 publications

References 35 publications

Simple synthesis of nanosheets of rGO and nitrogenated rGO

Simple synthesis of nanosheets of rGO and nitrogenated rGO

Effect of pH on the Reduction of Graphene Oxide on its Structure and Oxygen Reduction Capabilities in the Alkaline Media

Amperometric Glucose Biosensor Based on Pt‐Pd Nanoparticles Supported by Reduced Graphene Oxide and Integrated with Glucose Oxidase

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