Graphene Nanosheets and Quantum Dots: A Smart Material for Electrochemical Applications

Cincotto, Fernando Henrique; Moraes, Fernando C.; Machado, Sérgio Antônio Spínola

doi:10.1002/chem.201304853

Cited by 21 publications

(5 citation statements)

References 56 publications

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“…From an electrochemical point of view, interesting properties of graphene are its wide potential window (i.e., its electrochemical inertness), its fast charge transfer, and its electrocatalytic activity [7]. These characteristics make of graphene the most widely investigated material for applications in electrochemical devices, such as photoelectrochemical solar cells [8], supercapacitors [9], fuel cells [10], anode for pollutants degradation [11], and electrochemical sensors [12] and biosensensors [13].…”

Section: Introductionmentioning

confidence: 99%

Coupled electronic and morphologic changes in graphene oxide upon electrochemical reduction

Moraes

Freitas

Pereira

et al. 2015

Carbon

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A systematic study of the electrochemical reduction of graphene oxide was performed.The graphene oxide was reduced electrochemically in phosphate buffer solution by applying potential of -0.8 V for different times. The graphene oxide and the electrochemically reduced graphene oxide were characterized using ex-situ fieldemission gun scanning electron microscopy, in-situ Raman scattering and in-situ atomic force microscopy. Raman scattering showed that the reduction process is accompanied by an increase in the ratio between the D and the G bands of graphene, while the microscopies analyses revealed that the reduction procedure promotes changes in the morphology of the graphene oxide sheets that lead to an increase of the system roughness. Electrochemical impedance spectroscopy showed that reduction of graphene oxide promotes a decrease of the charge-transfer resistance upon electrochemical reduction. This observation was in agreement with the changes observed using cyclic voltammetry, which showed a reduction process improve the reversibility and increase the current peak. The increase in the roughness and an improvement of the electronic mobility brought upon electrochemical reduction are a function of the increase in the edge plane-like defects in the graphene layers.

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Section: Introductionmentioning

confidence: 99%

Coupled electronic and morphologic changes in graphene oxide upon electrochemical reduction

Moraes

Freitas

Pereira

et al. 2015

Carbon

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“…Semiconductor quantum dots (QDs), such as PbS,1, 2 CdS1 and CdSe,3–5 have been widely studied as efficient photo‐harvesting building blocks for the development of photovoltaic devices1–4, 6 and highly active photocatalysts7, 8 because of their enhanced light‐response through size quantization effect 9. 10 However, potential environmental risk caused by the presence of toxic elements and imperfect chemical/photo stability limit their practical applications 11–13. Photoluminescent carbon QDs (CQDs) have been recently scrutinized due to their low cost, low toxicity, high biocompatibility and good photoluminescence (PL) 14–16…”

Section: Methodsmentioning

confidence: 99%

“…[9,10] However,p otentiale nvironmental risk caused by the presence of toxic elementsa nd imperfect chemical/photo stability limit their practical applications. [11][12][13] Photoluminescent carbonQ Ds (CQDs)h ave been recentlys crutinized due to their lowc ost, low toxicity,h igh biocompatibility and good photoluminescence (PL). [14][15][16] Various routes have been developed to synthesize CQDs, such as hydrothermal/microwave carbonizationo fb iomass (e.g.,g lucose), [17][18][19][20] electrochemical oxidation of graphite, [21] plasma treatment, andl aser ablationo fg raphite.…”

mentioning

confidence: 99%

An Efficient Templating Approach for the Synthesis of Redispersible Size‐Controllable Carbon Quantum Dots from Graphitic Polymeric Micelles

Zhang¹,

Abbasi²,

Claverie³

2015

Chemistry A European J

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Access to high-quality, easily dispersible carbon quantum dots (CQDs) is essential in order to fully exploit their desirable properties. Copolymers based on N-acryloyl-D-glucosamine and acrylic acid prepared by reversible addition-fragmentation chain transfer (RAFT) polymerization are self-assembled into micelle-like nanoreactors. After a facile graphitization process (170 °C, atmospheric pressure), each micellar template is transformed into a CQD through a 1:1 copy process. These high-quality CQDs (quantum yield=22 %) with tunable sizes (2-5 nm) are decorated by carboxylic acid moieties and can be spontaneously redispersed in water and polar organic solvents. This preparation method renders the mass production of multifunctional CQDs possible. To demonstrate the versatility of this approach, CQDs hybridized TiO2 nanoparticles with enhanced photocatalytic activity under visible-light have been prepared.

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“…Electrochemical sensors made from different materials have shown great relevance in the determination of substances in water and urine for environmental and human health monitoring [10,11]. These sensors have relative operational simplicity, miniaturization and automation potential, low cost and high sensitivity [12,13]. Among the various materials available for the manufacture of new sensors, carbon black (CB) has stood out [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

A New Electrochemical Sensor Based on Carbon Black Modified With Palladium Nanoparticles for Direct Determination of 17α‐Ethinylestradiol in Real Samples

Fernandes

Bernardino

et al. 2022

Electroanalysis

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Electrochemical sensors to quantify concentrations of emerging pollutants have attracted great attention from the industry and scientific community. Nanomaterials such as carbon black have been applied in sensors to identify substances that are toxic to the environment and human health due to their excellent electroanalytical properties. The aim of the study was to develop a novel electrochemical sensor for the endocrine disruptor hormone determination. To our knowledge, for the first time the synthesis of material based on carbon black containing immobilized palladium nanoparticles, with the application for the hormone ethinylestradiol, is reported in the literature. The material was synthesized, characterized, and applied to the determination in tap water and human urine of the synthetic hormone 17α-ethinylestradiol (EE2), which is currently considered an emerging pollutant. The morphology, structure and electrochemical performance of the sensors were characterized by scanning electron microscopy (SEM) and cyclic voltammetry (CV). Differential pulse voltammetry (DPV) in sodium phosphate buffer solution at pH 5.0 allowed the generation of a method to quantify the concentration of 17αethinylestradiol in a linear range of 0.5-119.0 μmol L À 1 , obtaining 81.0 nmol L À 1 of calculated limit of detection (LOD). The system was efficient in detecting 17αethinylestradiol in real urine samples and showed no interferences for ascorbic acid, uric acid, progesterone, and dopamine. It is noteworthy that the results obtained showed good recovery values, considering that the urine samples were not previously treated or pre-concentrated, which suggests the development of an electrochemical sensor that works in situ and in real time to monitor relevant substances in the control clinical and environmental, with the possibility of point-of-care analyses.

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Graphene Nanosheets and Quantum Dots: A Smart Material for Electrochemical Applications

Cited by 21 publications

References 56 publications

Coupled electronic and morphologic changes in graphene oxide upon electrochemical reduction

Coupled electronic and morphologic changes in graphene oxide upon electrochemical reduction

An Efficient Templating Approach for the Synthesis of Redispersible Size‐Controllable Carbon Quantum Dots from Graphitic Polymeric Micelles

A New Electrochemical Sensor Based on Carbon Black Modified With Palladium Nanoparticles for Direct Determination of 17α‐Ethinylestradiol in Real Samples

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