Facile and green synthesis of graphene

Vusa, Chiranjeevi Srinivasa Rao; Berchmans, Sheela; Alwarappan, Subbiah

doi:10.1039/c4ra01718h

Cited by 44 publications

(22 citation statements)

References 32 publications

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“…The chemical reduction of GO enhanced the intensity ratio of the D to G bands (I D /I G ) from 0.974 to 0.986. The increase in the I D /I G ratio for rGO was due to the restoration of the sp 2 network and the formation of unrepaired defects after the removal of numerous oxygen functionalities [ 27 , 28 ]. Hence, it gives a clear indication of the effective reduction of GO.…”

Section: Resultsmentioning

confidence: 99%

“…Hence, it gives a clear indication of the effective reduction of GO. Furthermore, the appearance of the 2D band at 2662 cm -1 in the rGO spectrum indicates the reduction of GO to rGO [ 27 ]. The characteristic peaks of CdS presented at 301, 599, and 905 cm −1 correspond to the first-, second-, and third-order longitudinal optical phonon modes (1LO, 2LO, and 3LO), respectively.…”

Section: Resultsmentioning

confidence: 99%

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Cadmium Sulphide-Reduced Graphene Oxide-Modified Photoelectrode-Based Photoelectrochemical Sensing Platform for Copper(II) Ions

et al. 2016

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A photoelectrochemical (PEC) sensor with excellent sensitivity and detection toward copper (II) ions (Cu2+) was developed using a cadmium sulphide-reduced graphene oxide (CdS-rGO) nanocomposite on an indium tin oxide (ITO) surface, with triethanolamine (TEA) used as the sacrificial electron donor. The CdS nanoparticles were initially synthesized via the aerosol-assisted chemical vapor deposition (AACVD) method using cadmium acetate and thiourea as the precursors to Cd2+ and S2-, respectively. Graphene oxide (GO) was then dip-coated onto the CdS electrode and sintered under an argon gas flow (50 mL/min) for the reduction process. The nanostructured CdS was adhered securely to the ITO by a continuous network of rGO that also acted as an avenue to intensify the transfer of electrons from the conduction band of CdS. The photoelectrochemical results indicated that the ITO/CdS-rGO photoelectrode could facilitate broad UV-visible light absorption, which would lead to a higher and steady-state photocurrent response in the presence of TEA in 0.1 M KCl. The photocurrent decreased with an increase in the concentration of Cu2+ ions. The photoelectrode response for Cu2+ ion detection had a linear range of 0.5–120 μM, with a limit of detection (LoD) of 16 nM. The proposed PEC sensor displayed ultra-sensitivity and good selectivity toward Cu2+ ion detection.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Cadmium Sulphide-Reduced Graphene Oxide-Modified Photoelectrode-Based Photoelectrochemical Sensing Platform for Copper(II) Ions

et al. 2016

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“…After the addition of CMC, the peak at 230 nm shifted to 260 nm, suggesting the successful reduction of GO. The shift of the UV–Vis absorption peak is ascribed to the restoration of both electronic conjugation and sp 2 graphitic carbons within graphene sheets after a chemical reaction [ 30 ].…”

Section: Resultsmentioning

confidence: 99%

Reduced Graphene Oxide-Based Double Network Polymeric Hydrogels for Pressure and Temperature Sensing

Liu

Zhang

Wei

et al. 2018

Sensors

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We demonstrate the fabrication of novel reduced graphene oxide (rGO)-based double network (DN) hydrogels through the polymerization of poly(N-isopropylacrylamide) (PNIPAm) and carboxymethyl chitosan (CMC). The facile synthesis of DN hydrogels includes the reduction of graphene oxide (GO) by CMC, and the subsequent polymerization of PNIPAm. The presence of rGO in the fabricated PNIPAm/CMC/rGO DN hydrogels enhances the compressibility and flexibility of hydrogels with respect to pure PNIPAm hydrogels, and they exhibit favorable thermoresponsivity, compressibility, and conductivity. The created hydrogels can be continuously cyclically compressed and have excellent bending properties. Furthermore, it was found that the hydrogels are pressure- and temperature-sensitive, and can be applied to the design of both pressure and temperature sensors to detect mechanical deformation and to measure temperature. Our preliminary results suggest that these rGO-based DN hydrogels exhibit a high potential for the fabrication of soft robotics and artificially intelligent skin-like devices.

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“…Hummer’s method was adopted to synthesize graphene oxide (GO) 17 . Graphene (Gr) was synthesized using the previously reported method by our team 18 . In brief, carrot extract was obtained by boiling 20 g of carrot in 100 mL deionized water at 100 °C for 50 min, then filtered using whatman-40 filter paper.…”

Section: Methodsmentioning

confidence: 99%

Tactical tuning of the surface and interfacial properties of graphene: A Versatile and rational electrochemical approach

Vusa

Manju

Aneesh

et al. 2017

Sci Rep

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Designing a versatile and rational method for the tactical tuning of the surface and interfacial properties of graphene is an essential yet challenging task of many scientific areas including health care, sensors, energy, and the environment. A method was designed herein to tackle the challenge and tune the surface and interfacial properties of graphene using a simple electrochemical tethering of arylamines that provides diverse reactive end groups to graphene. This method resulted in the preparation of graphenes with thiol, hydroxy, amine, carboxyl, and sulfonate surface functionalities respectively. X-ray photoelectron spectroscopy, scanning electron microscopy, and cyclic voltammetry were used to study the chemical, morphological, and electrochemical properties of the modified graphenes. The results show the promising scope of the reported method towards the tactical tuning of the surface and interfacial properties of graphene. Also, this method can give fundamental insights of the surface tuning of graphene and its structurally similar materials. Hence, this approach can be used to advantageously tune the surface properties of the other structurally similar nanocarbons and their hybrid materials to make them potential candidates for many applications.

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Facile and green synthesis of graphene

Cited by 44 publications

References 32 publications

Cadmium Sulphide-Reduced Graphene Oxide-Modified Photoelectrode-Based Photoelectrochemical Sensing Platform for Copper(II) Ions

Cadmium Sulphide-Reduced Graphene Oxide-Modified Photoelectrode-Based Photoelectrochemical Sensing Platform for Copper(II) Ions

Reduced Graphene Oxide-Based Double Network Polymeric Hydrogels for Pressure and Temperature Sensing

Tactical tuning of the surface and interfacial properties of graphene: A Versatile and rational electrochemical approach

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