Tuning the electrochemical reduction of graphene oxide: structural correlations towards the electrooxidation of nicotinamide adenine dinucleotide hydride

Camargo, Maiuí N. L.; Santhiago, Murilo; Maroneze, Camila M.; Silva, Cecília C.C.; Timm, Ronaldo Adriano; Kubota, Lauro T.

doi:10.1016/j.electacta.2015.09.022

Cited by 24 publications

(20 citation statements)

References 30 publications

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“…The sensitivity obtained for pH 4 was higher than that obtained for others pH values ( Figure 3B) and therefore pH 4 was used for subsequent studies. [52,53] Incorporation of GQD at electrode surface was performed by cyclic voltammetry as suggest in literature [32,54], reduced graphene species are formed on the electrode surface by electrochemical measurements, that is, the p-p network conjugated bonds are restored with decrease of oxygenated groups amounts on carbonaceous surface, and the tuning of reduced graphene formed can be performed from by the modification of some experimental parameter. In this case, the electrodeposition step promotes reduced species formation and the number of voltammetric cycles is the parameter that will directly influence the degree of reduction, i. e. higher number of cycles greater reduction degree of GQD.…”

Section: Ph Influence and Reduction Degree Of Gqdsmentioning

confidence: 99%

Graphene Quantum Dots Modified Screen‐printed Electrodes as Electroanalytical Sensing Platform for Diethylstilbestrol

et al. 2019

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In present work a simple methodology for electroanalytical sensing of diethylstilbestrol (DES) using graphene quantum dots (GQD) surface modified screen‐printed electrodes (SPE) is reported. GQD was synthesized by simple bottom‐up method based on citric acid pyrolysis at 200 °C and electrodeposited directly at electrode surface under cyclic voltammetric conditions. The obtained GQD presented an average diameter of 7 nm and was characterized by techniques such as transmission and scanning electron microscopy, and electrochemical impedance spectroscopy. The proposed sensor exhibits a linear response from 0.05 to 7.5 μmol L−1, with limit of detection and quantification of 8.8 nmol L−1 and 29.0 nmol L−1, respectively. The repeatability study presented RSD=3.6 % for 6 consecutive measurements using the same electrode surface and the reproducibility study showed RSD=6.6 % for measurements with 6 different electrode surfaces. The proposed sensor was successfully applied for DES determination in synthetic urine and tap water spiked samples and good recoveries were obtained without any sample pre‐treatment, showing its promising analytical performance.

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Section: Ph Influence and Reduction Degree Of Gqdsmentioning

confidence: 99%

Graphene Quantum Dots Modified Screen‐printed Electrodes as Electroanalytical Sensing Platform for Diethylstilbestrol

et al. 2019

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“…Oxygen functionalities found at the surface of graphene oxide-based materials tune material properties, affecting their performance in supercapacitor and membrane applications. − For example, oxygen-containing functional groups (epoxy, alkoxy, carbonyl, and carboxylate groups) have been shown to improve the performance of supercapacitors, enhance material wettability in membranes, and filter ions from solution. − Furthermore, the additional electrostatic interactions between hydrated ions and the oxygen functional groups in GO can be tailored on the basis of (1) the GO oxidation state, which influences the quantity of oxygen functionalities, and (2) the electrolyte composition, via the degree of functional group protonation and resulting contribution to surface charge (Figure a). , …”

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confidence: 99%

Charge Storage in Graphene Oxide: Impact of the Cation on Ion Permeability and Interfacial Capacitance

et al. 2020

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The charge storage and membrane applications of graphene oxide (GO) materials are dictated by its intrinsic material properties. Structure–function relationships correlating periodic parameters, such as the hydrated ion radius and ion–GO interactions, are currently lacking yet are needed to provide insight on the charge storage and ion transport mechanism. We report the use of scanning ion conductance microscopy to measure the ion permeability of GO films and evaluate its relationship with the measured capacitance. We demonstrate that species (namely K+) with strong electrostatic interactions with the oxygen functionalities of GO provide the benefit of higher capacitance but suffer from inhibited ion mobility due to constriction of the GO interlayer spacing

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“…The current value was improved to 23 µ A for rGO/SPCEs owing to the electrochemical reduction process that removed a considerable number of oxygenated functional groups. Studies have shown that electrochemical reduction with precise control over the reduction potential and time [11,12] allows reproducibility of rGO for use in electrochemical devices [13]. We found that IgG/rGO/SPCEs achieved the highest current value of 73 µA, which could be due to the semiconductive nature of protein in dry and wet states [14].…”

Section: Linear Sweep Voltammetry For Bare Spces Go/spces Rgo/spces and Igg/rgo/spcesmentioning

confidence: 76%

Reduced Graphene Oxide on Screen-Printed Carbon Electrodes as Biosensor for Escherichia coli O157:H7 Detection

Barthasarathy

Salim

2020

The 1st International Electronic Conference on Biosensors

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Mixture of drinking-water supplies with sewage discharges poses disease threats in flood-stricken areas. In such exigent conditions, on-site testing of water samples is the only option, as water samples cannot be transported to laboratories owing to severely impacted transportation services. Hence, we developed a low-cost electrochemical biosensor fabricated from a screen-printed carbon electrode (SPCE) to detect E. coli O157:H7, a virulent pathogen often found in sewage discharges. We focused on understanding antigen-antibody interaction when the antibody used is not specific for E. coli O157:H7. We found that antibody immobilized on a reduced graphene oxide (rGO)–modified SPCEs distinguished between E. coli O157:H7 concentrations of 4 × 108 and 4 CFU/ml, with lowest current reported for 4 × 108 CFU/ml. In contrast, a reduced graphene oxide–modified SPCEs without antibody immobilization does not produce a prominent peak that distinguishes the highest and lowest E. coli concentrations. However, a few E. coli cells were still attached to the rGO/SPCEs in the absence of antibody, as shown in FESEM images. A processing step of differential readings from reference and active electrodes needs to be programmed into an Arduino® microprocessor to realize a prototype of a bacteria sensor for field use.

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Tuning the electrochemical reduction of graphene oxide: structural correlations towards the electrooxidation of nicotinamide adenine dinucleotide hydride

Cited by 24 publications

References 30 publications

Graphene Quantum Dots Modified Screen‐printed Electrodes as Electroanalytical Sensing Platform for Diethylstilbestrol

Graphene Quantum Dots Modified Screen‐printed Electrodes as Electroanalytical Sensing Platform for Diethylstilbestrol

Charge Storage in Graphene Oxide: Impact of the Cation on Ion Permeability and Interfacial Capacitance

Reduced Graphene Oxide on Screen-Printed Carbon Electrodes as Biosensor for Escherichia coli O157:H7 Detection

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