A new sustainable green protocol for production of reduced graphene oxide and its gas sensing properties

Sharma, Neeru; Sharma, Vikas; Vyas, Rishi; Kumari, Mitlesh; Kaushal, Akshey; Sharma, S. K.; Sachdev, K.

doi:10.1016/j.jsamd.2019.07.005

Cited by 42 publications

(25 citation statements)

References 39 publications

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“…Peaks in the O 1s spectrum also confirmed the same thing where lower content for >C=O groups was observed. The peaks at 531.0, 532.6 and 533.8 eV corresponding to C=O (carbonyl groups) (12.19 %), C−O−C/O−C=O (epoxy, ether and O−C bond in carboxylic acid) (48.20 %) and C−OH (hydroxyl groups) (39.60 %) functional groups were observed in this spectrum [24,25] (Table S2).…”

Section: Resultsmentioning

confidence: 84%

Pd‐Au Supported Reduced Graphene Oxide Catalyst for Carbon‐ Hydrogen Bond Activation in Benzene

2021

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An improved reduced graphene oxide supported bimetallic palladium and gold catalyst was synthesized for the carbonhydrogen bond activation of un-activated aromatic organic substrate benzene. XPS analysis has revealed that catalyst contained Au(0) nanoparticles with Pd(II) ions on its surface. The surface of rGO was found to be rich in sp 2 carbon content with > C=O groups that most probably provided supporting sites for the gold and palladium metals. The XRD analysis further confirmed that Au(0) nanoparticles with palladium oxide and palladium nanoparticles were present on rGO surface. The catalytic activity of the material was tested towards activation of benzene to form biphenyl as an end product. Density function theory has revealed that Pd(II) ion was the active component that insert itself in between CÀ H bond of benzene and showed efficiency to interact with oxygen molecules. Simultaneously, Au(0) atoms have the tendency to adsorb on the π-bonded surface of the catalyst and extend its conjugation that reduced the HOMO-LUMO gap of the catalyst and provided the good catalytic activity.

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Section: Resultsmentioning

confidence: 84%

Pd‐Au Supported Reduced Graphene Oxide Catalyst for Carbon‐ Hydrogen Bond Activation in Benzene

2021

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“…In the GO spectrum, the characteristic peak of C=O stretching vibration in −COOH appears at about 1627 cm −1 . 1216.97 cm −1 is due to δ H-O-H tensile vibration [25]. In the SA spectrum, the saturated C-H stretching vibration appears in the band around 2929 cm −1 .…”

Section: Microstructures and Chemical Analysismentioning

confidence: 93%

Strong and Tough PAm/SA Hydrogel with Highly Strain Sensitivity

Zhang¹,

Jiang²,

Zhao³

et al. 2022

JRM

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The hydrogel is a preferred material for flexible wearable sensors. In practical application, it should have highefficiency mechanical toughness and self-healing performance. Besides, hydrogel requires good affinity and adhesion because of its contact with the skin. In this experiment, we made an ultra-tough hydrogel with excellent cell affinity and adhesion. We used sodium alginate (SA) and polyacrylamide (PAm) mixture as a flexible base fluid. Polydopamine reduce graphene oxide (prGO) was used as conductive nanofiller, and then PAm-prGO-SA semiinterpenetrating network hydrogel was formed through Am radical polymerization. The presence of prGO endows the hydrogels with excellent electrical conductivity. Simultaneously, some non-reduced GO forms non-covalent cross-links with PAm, SA, and Polydopamine (PDA) in the hydrogel network. The stress of PAm-prGO-SA hydrogel can reach 750 KPa, and the strain is 900%. The hydrogel, combined with its excellent electrical, mechanical properties, and biocompatibility, is expected to be applied in portable, remote, and real-time health monitoring systems.

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“…They also check the reaction of such material with respect to the appearance of hydrogen in the surrounding atmosphere. Also, the authors of [22] have successfully used reduced graphene oxide to detect NO 2 . The other gas analytes could also be detected using rGOs.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Gas Sensing Properties of Reduced Graphene Oxide Obtained by Two Different Methods

Drewniak

Procek

Muzyka

et al. 2020

Sensors

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In this study, the sensitivity of reduced graphene oxide structures (rGO) to the action of selected gases (especially hydrogen, but also nitrogen dioxide and ammonia) was examined. Two sensing structures, based on rGO structures, obtained by different methods of oxidation (the modified Hummers, and the modified Tour’s method respectively), were investigated. We show here that the method used for the oxidation of rGO influences the sensitivity of the sensing structure during contact with various gaseous atmospheres. We performed our experiments in the atmosphere, containing hydrogen in a concentration range from 0 to 4% in nitrogen or synthetic air, both in dry and wet conditions. The temperature range was from 50 °C to 190 °C. Finally, we checked how the resistance of the samples changes when the other gases (NO2, NH3) appear in tested gas mixtures. The gas investigations were supplemented by the characterization of rGOs materials using scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and N2 sorption method.

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A new sustainable green protocol for production of reduced graphene oxide and its gas sensing properties

Cited by 42 publications

References 39 publications

Pd‐Au Supported Reduced Graphene Oxide Catalyst for Carbon‐ Hydrogen Bond Activation in Benzene

Pd‐Au Supported Reduced Graphene Oxide Catalyst for Carbon‐ Hydrogen Bond Activation in Benzene

Strong and Tough PAm/SA Hydrogel with Highly Strain Sensitivity

Comparison of Gas Sensing Properties of Reduced Graphene Oxide Obtained by Two Different Methods

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