Probing the Electrochemical Properties of Graphene Nanosheets for Biosensing Applications

Alwarappan, Subbiah; Erdem, Arzum; Liu, Chang; Li, Chen-Zhong

doi:10.1021/jp9010313

Cited by 577 publications

(380 citation statements)

References 22 publications

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“…As it was noticed in [31], the activation of graphite toward Fe(CN) 6 3−/4− redox reaction is rather related to the lattice damage than surface oxides. As we show, redox reactions of Fe(CN) 6 3−/4− occur at both the anodized graphite and EG. To resolve the question whether surface functional groups, which are unresistant to the reduction, or more stable topological defects are responsible for catalytic activity of electrodes, the CV tests were repeated at electrochemically reduced electrodes.…”

Section: Introductionmentioning

confidence: 69%

“…2. No electrochemical response for Fe(CN) 6 3−/4− is observed at pristine electrodes. These results coincide with the observed low electrocatalytic activity of the EG toward oxygen reduction reaction [37].…”

Section: Resultsmentioning

confidence: 93%

“…It has been shown that during electrochemical oxidation, several functional groups connect to the graphite basal plane and many multivacancies and small etch pits appear [30]. As it was noticed in [31], the activation of graphite toward Fe(CN) 6 3−/4− redox reaction is rather related to the lattice damage than surface oxides. As we show, redox reactions of Fe(CN) 6 3−/4− occur at both the anodized graphite and EG.…”

Section: Introductionmentioning

confidence: 93%

“…Glassy carbon electrodes modified with reduced graphene oxide demonstrate fast electron transfer [5] and possess good effectiveness toward simultaneous detection of ascorbic acid, dopamine, and serotonin [6,7]. The DNA-bases sensors on the base of reduced graphene oxide were prepared as well [8].…”

Section: Introductionmentioning

confidence: 99%

“…CV data obtained at EG electrode were compared with graphite. We have chosen Fe(CN) 6 3−/4− as a benchmark system. This redox pair is very sensitive to the state of the surface and has been used in the investigations of electrocatalytic activity of carbon electrodes [24].…”

Section: Introductionmentioning

confidence: 99%

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Insights into electrocatalytic activity of epitaxial graphene on SiC from cyclic voltammetry and ac impedance spectroscopy

Szroeder¹,

Tsierkezos

Walczyk³

et al. 2014

J Solid State Electrochem

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Electrocatalytic activity of graphene grown epitaxially on SiC is studied using cyclic voltammetry and electrochemical impedance spectroscopy. AFM images show steplike topography of SiC-graphene. For ferri-/ferrocyanide redox couple, no voltammetric response is observed at the pristine graphene. Basal planes of graphite are electrochemically inactive as well. After electrochemical oxidation, apparent redox peaks appear at both the graphene and graphite electrode. However, more intensive redox peaks are observed at graphene, where simultaneous redox reaction with the adsorbed and the diffused ferri-/ferrocyanide ions occurs. Electrochemical impedance measurements show that the graphene electrode behaves like an array of microelectrodes. We used the partially blocked electrode model to fit impedance data. Using the fitting parameters, a size of microelectrodes was found to be 23.8±2.1 μm and the active surface of graphene was estimated to be 21 %. A value of the standard electron transfer rate constant found for the anodized epitaxial graphene (2.16±0.32)×10) is by one order of magnitude lower than the standard rate constant estimated for the anodized graphite basal planes (∼5 × 10 − 2 cm ⋅ s − 1 ).Electrochemical reduction causes total disappearance of electrochemical responses at the graphene electrode, whereas only slight decrease of the peak currents is observed at the reduced graphene. Such behavior proves that different activation mechanisms occur at the graphene and graphite electrodes.

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Section: Introductionmentioning

confidence: 69%

Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Insights into electrocatalytic activity of epitaxial graphene on SiC from cyclic voltammetry and ac impedance spectroscopy

Szroeder¹,

Tsierkezos

Walczyk³

et al. 2014

J Solid State Electrochem

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Electroanalytical Methods Based on Hybrid Nanomaterials

Yáñez‐Sedeño

Villalonga

Pingarrón

2019

Encyclopedia of Analytical Chemistry

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Hybrid nanomaterials, defined as intentional combination of at least one nanomaterial with one or more materials, at an atomic or nanometer‐level of mixture, complementing each other to have new or improved functions and properties which component materials do not possess, provide new possibilities for electroanalytical methods The relevant functional properties of nanomaterials can be tuned, in an unimaginable fashion, by rational combination with other materials. This fact opens an exciting door for sensor and biosensor technology, which is well supported by the advances in other areas such as surface science, organic and inorganic synthesis, polymer and biomolecular chemistry, and nanotechnology. This article provides a general sight state‐of‐the‐art on the use of nanosized hybrid materials as transduction, amplification, and labeling elements for the development of original electroanalytical methods, exemplifying with some of the most relevant research published in the last 5 years. The article is divided into two main sections: (i) electrochemical sensors based on hybrid nanomaterials of inorganic–organic, inorganic–inorganic, and organic–organic composition; (ii) electrochemical enzyme and affinity biosensors making use of hybrid nanostructures.

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Nanomaterials Incorporated Bioelectronics

Alwarappan

2010

Encyclopedia of Industrial Biotechnology

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Bioelectronics can be defined as the functional integration of biological molecules together with electronic components. Bioelectronic systems combine the specific recognition properties of proteins or DNA with the mechanical and electrical properties of metallic or semiconducting solid‐state materials. A major aspect of a bioelectronic device is the generation or modulation of electrical current in an electronic circuit by means of molecular binding of the analyte of interest. In this article, we essentially give a brief introduction to bioelectronics followed by details about biosensors and their classification based on the molecular recognition component, methods of transduction, and materials employed. Following this, we have then briefly discussed the usefulness of a nanomaterials‐based system as transducer elements. In the next section, we summarize the efforts made by different researchers to develop a framework to support the biological machinery and its working principles for self‐assembly of molecular electronics. Next, we account for the usefulness of employing various carbon materials such as carbon nanotubes, carbon fibers, carbon onion, and the recently invented graphene as a substrate to design nanoscale biosensors for various applications. Finally, we have also provided information on artificial neural networks, their development and possible applications in medicine.

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Probing the Electrochemical Properties of Graphene Nanosheets for Biosensing Applications

Cited by 577 publications

References 22 publications

Insights into electrocatalytic activity of epitaxial graphene on SiC from cyclic voltammetry and ac impedance spectroscopy

Insights into electrocatalytic activity of epitaxial graphene on SiC from cyclic voltammetry and ac impedance spectroscopy

Electroanalytical Methods Based on Hybrid Nanomaterials

Nanomaterials Incorporated Bioelectronics

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