Controlled synthesis of partially reduced graphene oxide: Enhance electrochemical determination of isoniazid with high sensitivity and stability

Zhu, Xiaofei; Xu, Jingkun; Duan, Xuemin; Lu, Limin; Zhang, Kaixin; Yu, Yongfang; Xing, Huakun; Gao, Yansha; Dong, Liqi; Sun, Hui; Yang, Taotao

doi:10.1016/j.jelechem.2015.09.038

Cited by 30 publications

(18 citation statements)

References 45 publications

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“…Two different electrochemical reduction approaches were used to synthesize electrochemically reduced graphene oxide (ERGO): a one-step approach that involves direct electrochemical deposition of graphene in GO suspension onto an electrode surface, and a two-step approach that requires pre-deposition of GO onto the surface of an electrode to induce electrochemical reduction [25,26]. The influencing factors for synthesis of ERGO, such as the optimization of pH value [27], different cycle numbers of performing cyclic voltammetry (CV) [27], and applied potential [28,29] also have been studied. ERGO has been extensively explored as a candidate material for electrodes and their modification [30].…”

Section: Introductionmentioning

confidence: 99%

Effect of morphology and defect density on electron transfer of electrochemically reduced graphene oxide

Zhang

Wang

2016

Applied Surface Science

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Electrochemically reduced graphene oxide (ERGO) is widely used to construct electrochemical sensors. Understanding the electron transfer behavior of ERGO is essential for its electrode material applications. In this paper, different morphologies of ERGO were prepared via two different methods. Compared to ERGO/GCEs prepared by electrochemical reduction of pre-deposited GO, more exposed edge planes of ERGO are observed on the surface of ERGO-GCE that was constructed by electrophoretic deposition of GO. The defect densities of ERGO were controlled by tuning the mass or concentration of GO. The electron transfer kinetics (k 0 ) of GCE with different ERGOs was comparatively investigated. Owing to increased surface areas and decreased defect density, the k 0 values of ERGO/GCE initially increase and then decrease with incrementing of GO mass. When the morphology and surface real areas of ERGO-GCE are the same, an increased defect density induces an accelerated electron transfer rate. k 0 valuesof ERGO-GCEs are about 1 order of magnitude higher than those of ERGO/GCEs due to the difference in the amount of edge planes. This work demonstrates that both defect densities and edge planes of ERGO play crucial roles in electron transfer kinetics.

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Section: Introductionmentioning

confidence: 99%

Effect of morphology and defect density on electron transfer of electrochemically reduced graphene oxide

Zhang

Wang

2016

Applied Surface Science

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“…B TEM images of graphene nanoplates (1–5 nm), graphene nanoplates (5–20 nm), micro-graphite, and SEM image of natural graphite (top to bottom) [50]. C SEM images of GO ( a ) and ERGO ( b ) [118]…”

Section: Morphology Disorder and Defects Influence Electrical Conducmentioning

confidence: 99%

Impact of nano-morphology, lattice defects and conductivity on the performance of graphene based electrochemical biosensors

Tite¹,

Chiticaru²,

Burns³

et al. 2019

J Nanobiotechnol

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Diverse properties of graphenic materials have been extensively explored to determine properties that make good electrochemical nanomaterial-based biosensors. These are reviewed by critically examining the influence of graphene nano-morphology, lattice defects and conductivity. Stability, reproducibility and fabrication are discussed together with sensitivity and selectivity. We provide an outlook on future directions for building efficient electrochemical biosensors.

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“…The increase in the electroactive surface area of prGO-PEDOT:PSS/SPCEs from GO-PEDOT:PSS/SPCEs could be due to the reduction of GO to prGO. The structure of prGO is made up of some oxygenated functional groups on the edges and basal plane of carbon atoms [15,22]. Furthermore, prGO has a semi-restored π conjugation and sp 2 lattice, which increases the conductivity of the material compared to GO [25].…”

Section: Cyclic Voltammetry For Different Electrode Modificationsmentioning

confidence: 99%

“…Partially reduced graphene (prGO) is produced by mild electrochemical reduction of GO in a slightly acidic buffer solution (pH 5) to prevent the loss of all GO oxygenated functional groups [21][22][23][24]. For prGO, the π conjugation is partially restored, while the conductivity of the material is maintained [25].…”

Section: Introductionmentioning

confidence: 99%

Cyclic Voltammetric and Electrical Impedance Spectroscopy Studies of Graphene- and Conductive Polymer-based Enzyme Electrodes

Ismail

Ramli

Abd-Wahab

et al. 2019

IJIE

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Screen-printed carbon electrodes (SPCEs), modified with graphene oxide and poly(3,4ethylenedioxythiophene):polystyrenesulfonic acid (GO-PEDOT:PSS/SPCEs), and SPCEs modified with partially reduced GO and PEDOT:PSS (prGO-PEDOT:PSS/SPCEs) were studied for electrochemical transduction. Randles-Sevcik analysis showed that the prGO-PEDOT:PSS/SPCE has a higher effective surface area of 219.3 µm 2 in comparison to the unreduced GO-PEDOT:PSS/SPCE (87.0 µm 2) and the bare SPCE (71.7 µm 2). Using electrical impedance spectroscopy (EIS), we determined that the prGO-PEDOT:PSS/SPCE has a lower charge-transfer resistance (Rct) of 163.82 Ω in comparison to the GO-PEDOT:PSS/SPCE (427.87 Ω) and the bare SPCE (13.31 kΩ). Glucose oxidase (GOx) was immobilized on all electrode types, including GO/SPCE as additional control and tested with low (0.2 mM), intermediate (0.6 mM), and high (1 mM) glucose concentrations. GOx/GO/SPCEs showed the largest change in anodic peak current (Ipa), 8.5, 7.5 and 4.9 µA for low, intermediate, and high glucose concentrations, respectively. Interestingly, GOx/prGO-PEDOT:PSS/ SPCEs have no change in both anodic and cathodic peak current, although they exhibit better redox capability, while GOx/SPCEs have very low Ipa. The results show that the high effective surface area and low charge-transfer resistance (Rct) of prGO-PEDOT:PSS/ SPCEs do not necessarily result in a sensitive glucose sensor in cases where immobilizatio n of enzymes on the material can affect electron transfer.

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Controlled synthesis of partially reduced graphene oxide: Enhance electrochemical determination of isoniazid with high sensitivity and stability

Cited by 30 publications

References 45 publications

Effect of morphology and defect density on electron transfer of electrochemically reduced graphene oxide

Effect of morphology and defect density on electron transfer of electrochemically reduced graphene oxide

Impact of nano-morphology, lattice defects and conductivity on the performance of graphene based electrochemical biosensors

Cyclic Voltammetric and Electrical Impedance Spectroscopy Studies of Graphene- and Conductive Polymer-based Enzyme Electrodes

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