Graphene Based Electrochemical Sensors and Biosensors: A Review

Shao, Yuyan; Wang, Jun; Wang, Hong; Li, Jun; Aksay, İlhan A.; Lin, Yuehe

doi:10.1002/elan.200900571

Cited by 2,886 publications

(1,666 citation statements)

References 134 publications

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“…For example, 3-fold, 23-fold, and 100-fold increases in oxidation currents were obtained with po-Gr-, PEDOT:PSS-, and po-Gr-PEDOT:PSS-modified GCE's, respectively compared to 23.4 µA obtained with bare GCE (Figure 7). These I pa increases are attributed to the combined effects of sulfonic (Pillay et al, 2013) and thiol (Chandrasekhar et al, 2007;Kadarkaraisamy et al, 2011;Mandal et al, 2013) functional groups on PEDOT:PSS matrix/po-Gr nanocomposite (Shao et al, 2010;Anandhakumar et al, 2012). The effect of scan rate on the voltammograms of Hg 2+ at 0.4 mM concentration is shown in Figure 8A.…”

Section: Linear Sweep Voltammetrymentioning

confidence: 97%

Highly Selective Mercury Detection at Partially Oxidized Graphene/Poly(3,4-Ethylenedioxythiophene):Poly(Styrenesulfonate) Nanocomposite Film-Modified Electrode

et al. 2014

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Partially oxidized graphene flakes (po-Gr) were obtained from graphite electrode by an electrochemical exfoliation method. As-produced po-Gr flakes were dispersed in water with the assistance of poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT:PSS). The po-Gr flakes and the po-Gr/PEDOT:PSS nanocomposite (po-Gr/PEDOT:PSS) were characterized by Raman spectroscopy, Fourier transform-infrared spectroscopy (FT-IR), UV-Vis spectroscopy, X-ray diffraction (XRD), and scanning electron microscopy (SEM). In addition, we demonstrated the potential use of po-Gr/PEDOT:PSS electrode in electrochemical detection of mercury ions (Hg 2+ ) in water samples. The presence of po-Gr sheets in PEDOT:PSS film greatly enhanced the electrochemical response for Hg 2+ . Cyclic voltammetry measurements showed a well-defined Hg 2+ redox peaks with a cathodic peak at 0.23V, and an anodic peak at 0.42V. Using differential pulse stripping voltammetry, detection of Hg 2+ was achieved in the range of 0.2-14 µM (R 2 = 0.991), with a limit of detection of 0.19 µM for Hg 2+ . The electrode performed satisfactorily for sensitive and selective detection of Hg 2+ in real samples, and the po-Gr/PEDOT:PSS film remains stable on the electrode surface for repeated use.Therefore, our method is potentially suitable for routine Hg 2+ sensing in environmental water samples.

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Section: Linear Sweep Voltammetrymentioning

confidence: 97%

Highly Selective Mercury Detection at Partially Oxidized Graphene/Poly(3,4-Ethylenedioxythiophene):Poly(Styrenesulfonate) Nanocomposite Film-Modified Electrode

et al. 2014

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“…[12] This electrochemical current is -however -at the basis of graphene electrochemical (GEC) biosensors, which are complementary to GFETs. [216] In this regard, it is necessary to understand the construction as well as the Similarly to GFETs, the GEC uses the surface of graphene as the major sensing element. Until now, the majority of GECs uses graphene dispersions (usually nanosheets of chemically functionalized graphene) deposited on conductive electrodes.…”

Section: Graphene-based Electrochemical (Gec) Biosensorsmentioning

confidence: 99%

Sensing at the Surface of Graphene Field‐Effect Transistors

et al. 2016

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Abstract. 10Recent research trends now offer new opportunities for developing the next generations of label-free biochemical sensors using graphene and other two-dimensional materials. While the physics of graphene transistors operated in electrolyte is well grounded, important chemical challenges still remain to be addressed, namely the impact of the chemical functionalizations of graphene on the key electrical parameters and the sensing performances. In fact, graphene -at least ideal graphene -is highly chemically inert. The 15 functionalizations and chemical alterations of the graphene surface -both covalently and non-covalently -are crucial steps that define the sensitivity of graphene. The presence, reactivity, adsorption of gas and ions, proteins, DNA, cells and tissues on graphene have been successfully monitored with graphene. This review aims to unify most of the work done so far on biochemical sensing at the surface of a (chemically functionalized) graphene field-effect transistor and the challenges that lie ahead. We are convinced that graphene biochemical sensors 20 hold great promises to meet the ever-increasing demand for sensitivity, especially looking at the recent progresses suggesting that the obstacle of Debye screening can be overcome.2

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“…prevent the oxidation of Cu [4,5]. Graphenes huge potential use as a sensor has already been shown for DNA and glucose biosensors [6] and even the detection of individual gas molecules has been demonstrated [7].…”

Section: Introductionmentioning

confidence: 99%

Detecting swift heavy ion irradiation effects with graphene

Ochedowski

Akcöltekin

Ban-d’Etat

et al. 2013

Nuclear Instruments and Methods in Physics Research Section B:

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In this paper we show how single layer graphene can be utilized to study swift heavy ion (SHI) modifications on various substrates. The samples were prepared by mechanical exfoliation of bulk graphite onto SrTiO 3 , NaCl and Si(111), respectively. SHI irradiations were performed under glancing angles of incidence and the samples were analysed by means of atomic force microscopy in ambient conditions. We show that graphene can be used to check whether the irradiation was successful or not, to determine the nominal ion fluence and to locally mark SHI impacts. In case of samples prepared in situ, graphene is shown to be able to catch material which would otherwise escape from the surface.

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Graphene Based Electrochemical Sensors and Biosensors: A Review

Cited by 2,886 publications

References 134 publications

Highly Selective Mercury Detection at Partially Oxidized Graphene/Poly(3,4-Ethylenedioxythiophene):Poly(Styrenesulfonate) Nanocomposite Film-Modified Electrode

Highly Selective Mercury Detection at Partially Oxidized Graphene/Poly(3,4-Ethylenedioxythiophene):Poly(Styrenesulfonate) Nanocomposite Film-Modified Electrode

Sensing at the Surface of Graphene Field‐Effect Transistors

Detecting swift heavy ion irradiation effects with graphene

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