Electrochemical Reduction of Oriented Graphene Oxide Films: An in Situ Raman Spectroelectrochemical Study

Ramesha, Ganganahalli K.; Sampath, S.

doi:10.1021/jp811377n

Cited by 542 publications

(342 citation statements)

References 32 publications

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“…Besides, the D band and G band of RGO shifted towards lower wave numbers. This result was similar to previous report about the electrochemical reduction of GO to RGO [26]. The Raman spectra demonstrated that GO had been successfully transformed to RGO by electrochemical reduction [27].…”

Section: Electrodeposition Of Aunps-rgo Composite and Characterizationsupporting

confidence: 92%

A Self‐assembled L‐Cysteine and Electrodeposited Gold Nanoparticles‐reduced Graphene Oxide Modified Electrode for Adsorptive Stripping Determination of Copper

Zhang

Huang

et al. 2017

Electroanalysis

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Glassy carbon electrode (GCE) modified with L-cysteine and gold nanoparticles-reduced graphene oxide (AuNPs-RGO) composite was fabricated as a novel electrochemical sensor for the determination of Cu 2 + . The AuNPs-RGO composite was formed on GCE surface by electrodeposition. The L-cysteine was decorated on AuNPs by self-assembly. Physicochemical and electrochemical properties of L-cysteine/AuNPs-RGO/GCE were characterized by scanning electron microscopy, atomic force microscopy, energy dispersive spectroscopy, Raman spectroscopy, X-ray diffraction, cyclic voltammetry and adsorptive stripping voltammetry. The results validated that the prepared electrode had many attractive features, such as large electroactive area, good electrical conductivity and high sensitivity. Experimental conditions, including electrodeposition cycle, self-assembly time, electrolyte pH and preconcentration time were studied and optimized. Stripping signals obtained from L-cysteine/ AuNPs-RGO/GCE exhibited good linear relationship with Cu 2 + concentrations in the range from 2 to 60 mg L À1 , with a detection limit of 0.037 mg L À1 . Finally, the prepared electrode was applied for the determination of Cu 2 + in soil samples, and the results were in agreement with those obtained by inductively coupled plasma mass spectrometry.

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Section: Electrodeposition Of Aunps-rgo Composite and Characterizationsupporting

confidence: 92%

A Self‐assembled L‐Cysteine and Electrodeposited Gold Nanoparticles‐reduced Graphene Oxide Modified Electrode for Adsorptive Stripping Determination of Copper

Zhang

Huang

et al. 2017

Electroanalysis

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“…In addition, the G peak of GO and rGO is shifted to higher frequencies (1598 cm − 1 ) with respect to graphene and graphite due to the presence of defects. During the thermal reduction of GO, I D /I G remains constant, although an increase in the I D /I G ratio of rGO after electrochemical reduction has been reported in the literature 55 . In this study, this ratio was significantly increased compared to that for GO (from 0.87 to 1.1).…”

Section: Results and Discussion Characterization Of Graphene Oxide Sementioning

confidence: 93%

Toward point-of-care management of chronic respiratory conditions: Electrochemical sensing of nitrite content in exhaled breath condensate using reduced graphene oxide

et al. 2017

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We present a portable non-invasive approach for measuring indicators of inflammation and oxidative stress in the respiratory tract by quantifying a biomarker in exhaled breath condensate (EBC). We discuss the fabrication and characterization of a miniaturized electrochemical sensor for detecting nitrite content in EBC using reduced graphene oxide. The nitrite content in EBC has been demonstrated to be a promising biomarker of inflammation in the respiratory tract, particularly in asthma. We utilized the unique properties of reduced graphene oxide (rGO); specifically, the material is resilient to corrosion while exhibiting rapid electron transfer with electrolytes, thus allowing for highly sensitive electrochemical detection with minimal fouling. Our rGO sensor was housed in an electrochemical cell fabricated from polydimethyl siloxane (PDMS), which was necessary to analyze small EBC sample volumes. The sensor is capable of detecting nitrite at a low over-potential of 0.7 V with respect to an Ag/AgCl reference electrode. We characterized the performance of the sensors using standard nitrite/buffer solutions, nitrite spiked into EBC, and clinical EBC samples. The sensor demonstrated a sensitivity of 0.21 μA μM − 1 cm − 2 in the range of 20-100 μM and of 0.1 μA μM − 1 cm − 2 in the range of 100-1000 μM nitrite concentration and exhibited a low detection limit of 830 nM in the EBC matrix. To benchmark our platform, we tested our sensors using seven pre-characterized clinical EBC samples with concentrations ranging between 0.14 and 6.5 μM. This enzyme-free and label-free method of detecting biomarkers in EBC can pave the way for the development of portable breath analyzers for diagnosing and managing changes in respiratory inflammation and disease.

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“…Such reduction reagents have been reported to achieve a high degree of G-O reduction in the solution phase. Recently, electrochemical reduction methods have been introduced without the use of reducing reagents 8,9 . Until now, hydrazine hydrate, the most widely used reducing agent, was used in this work as a control to reduce G-O (RG-O NH2-NH2 ) in both the solution and gas phases.…”

mentioning

confidence: 99%

Reduced graphene oxide by chemical graphitization

et al. 2010

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Reduced graphene oxides (RG-os) have attracted considerable interest, given their potential applications in electronic and optoelectronic devices and circuits. However, very little is known regarding the chemically induced reduction method of graphene oxide (G-o) in both solution and gas phases, with the exception of the hydrazine-reducing agent, even though it is essential to use the vapour phase for the patterning of hydrophilic G-os on prepatterned substrates and in situ reduction to hydrophobic RG-os. In this paper, we report a novel reducing agent system (hydriodic acid with acetic acid (HI-AcoH)) that allows for an efficient, one-pot reduction of a solution-phased RG-o powder and vapour-phased RG-o (VRG-o) paper and thin film. The reducing agent system provided highly qualified RG-os by mass production, resulting in highly conducting RG-o HI − AcoH . moreover, VRG-o HI − AcoH paper and thin films were prepared at low temperatures (40 °C) and were found to be applicable to flexible devices. This one-pot method is expected to advance research on highly conducting graphene platelets.

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Electrochemical Reduction of Oriented Graphene Oxide Films: An in Situ Raman Spectroelectrochemical Study

Cited by 542 publications

References 32 publications

A Self‐assembled L‐Cysteine and Electrodeposited Gold Nanoparticles‐reduced Graphene Oxide Modified Electrode for Adsorptive Stripping Determination of Copper

A Self‐assembled L‐Cysteine and Electrodeposited Gold Nanoparticles‐reduced Graphene Oxide Modified Electrode for Adsorptive Stripping Determination of Copper

Toward point-of-care management of chronic respiratory conditions: Electrochemical sensing of nitrite content in exhaled breath condensate using reduced graphene oxide

Reduced graphene oxide by chemical graphitization

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