Electrochemical Resolution of Multiple Redox Events for Graphene Quantum Dots

Shinde, Dhanraj B.; Pillai, Vijayamohanan K.

doi:10.1002/ange.201208904

Cited by 20 publications

(22 citation statements)

References 61 publications

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“…Indeed, most studies investigate the electrocatalytic activity of GQD-coated electrodes towards different model redox probes and electroactive analytes with a view of potential use for electroanalysis. 27,28 The intrinsic electrochemistry of GQD has been investigated in different works 29,30 in order to characterize this type of compounds. However, there are not electrochemical studies about the influence of the redox state of GQD on the optical properties of this new material.…”

Section: Toc Graphics Abstractmentioning

confidence: 99%

In-situ Evidence of the Redox-State Dependence of Photoluminescence in Graphene Quantum Dots

Barrera

Ibáñez

Heras

et al. 2017

J. Phys. Chem. Lett.

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Changes in the optical properties of graphene quantum dots (GQD) during electrochemical reduction and oxidation were investigated by photoluminescence (PL) spectroelectrochemistry, which provided direct in situ evidence of the dependence of GQD luminescence on their redox state. We demonstrated that GQD PL intensity was enhanced upon reduction (quantum yield increased from 0.44 to 0.55) and substantially bleached during oxidation (quantum yield ∼0.12). Moreover, PL emission blue/red-shifted upon GQD reduction/oxidation, rendering information about electronic transitions involved in the redox processes, namely, the π → π* and the n → π* transitions between energy levels of the aromatic sp domains and the functional groups, respectively. PL intensity changes during GQD reduction/oxidation resulted from a variation in structural changes in GQD as a result of charge injection, as corroborated by in situ Raman spectroelectrochemistry.

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Section: Toc Graphics Abstractmentioning

confidence: 99%

In-situ Evidence of the Redox-State Dependence of Photoluminescence in Graphene Quantum Dots

Barrera

Ibáñez

Heras

et al. 2017

J. Phys. Chem. Lett.

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“…Furthermore, GQDs of tunable sizes, i.e. , 2.2±0.3, 2.6±0.2, and 3±0.3 nm, can act as multivalent redox species using cyclic voltammetry (CV) and differential pulse voltammetry (DPV) measurements, and present exciting opportunities for building electrochemical sensors [8] . More recently, GQDs have been used in the area of bioanalysis [6] , [7] , [9] .…”

Section: Introductionmentioning

confidence: 99%

Graphene quantum dot modified glassy carbon electrode for the determination of doxorubicin hydrochloride in human plasma

Hashemzadeh

Hasanzadeh

Shadjou

et al. 2016

Journal of Pharmaceutical Analysis

121

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Low toxic graphene quantum dot (GQD) was synthesized by pyrolyzing citric acid in alkaline solution and characterized by ultraviolet--visible (UV–vis) spectroscopy, X-ray diffraction (XRD), atomic force microscopy (AFM), spectrofluorimetery and dynamic light scattering (DLS) techniques. GQD was used for electrode modification and electro-oxidation of doxorubicin (DOX) at low potential. A substantial decrease in the overvoltage (−0.56 V) of the DOX oxidation reaction (compared to ordinary electrodes) was observed using GQD as coating of glassy carbon electrode (GCE). Differential pulse voltammetry was used to evaluate the analytical performance of DOX in the presence of phosphate buffer solution (pH 4.0) and good limit of detection was obtained by the proposed sensor. Such ability of GQD to promote the DOX electron-transfer reaction suggests great promise for its application as an electrochemical sensor.

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“…The mechanism of the exfoliation was due to complex interplay of anodic oxidative cleavage of water and anionic intercalation from the ionic liquid using titanium cathode and spectrum pure graphite in the center of electrolyzer to yield pure blue fluorescent CDs without the urgency of complex purification [28,[58][59][60][61][62].…”

Section: Electrochemical Methodsmentioning

confidence: 99%

Synthesis and Applications of Organic-Based Fluorescent Carbon Dots: Technical Review

Pudza¹,

Abidin²

2021

Novel Nanomaterials

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New ways of synthesizing organic-based fluorescent carbon dots (CDs) are required in environmental application. This is crucial for mitigation and control of pollutants without increasing the risk of releasing byproduct pollutants as the case with non-organic (metallic) quantum based substrate. Notably, this study provides current research on sustainable synthesis of CDs and their applications through analytical concept of recent and advance techniques for efficient and optimized processes. New scrutinized methods of synthesis and applications of CDs are beneficial and essential to optimize the state-of-art practices. The value distilled in this study adds to the field of sustainable production and application of CDs.

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Electrochemical Resolution of Multiple Redox Events for Graphene Quantum Dots

Cited by 20 publications

References 61 publications

In-situ Evidence of the Redox-State Dependence of Photoluminescence in Graphene Quantum Dots

In-situ Evidence of the Redox-State Dependence of Photoluminescence in Graphene Quantum Dots

Graphene quantum dot modified glassy carbon electrode for the determination of doxorubicin hydrochloride in human plasma

Synthesis and Applications of Organic-Based Fluorescent Carbon Dots: Technical Review

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