A novel voltammetric sensor for the simultaneous detection of Cd2+ and Pb2+ using graphene oxide/κ-carrageenan/l-cysteine nanocomposite

Shanmugapriya, T.; Dhanalakshmi, N.; Thennarasu, Sathiah; Thinakaran, N.

doi:10.1016/j.carbpol.2017.11.017

Cited by 90 publications

(35 citation statements)

References 35 publications

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“…Thus, it is not surprising that atomically thin two-dimensional materials such as graphene are proving to be a popular platform for creating ultra-sensitive sensors, which are able to feel even individual adsorbates [ 29 ]. Since the discovery of graphene in 2004 [ 30 ], many research groups attempted to implement graphene-based materials to electrochemical sensors for real-time detection and quantification of Lead [ 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 ]. Existing literature data suggest that modification of the working electrodes by (reduced) graphene oxide, graphene quantum dots and graphene-containing nanocomposites is the most popular way to improve the sensitivity of traditional working electrodes towards Lead detection.…”

Section: Introductionmentioning

confidence: 99%

Understanding Graphene Response to Neutral and Charged Lead Species: Theory and Experiment

et al. 2018

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Deep understanding of binding of toxic Lead (Pb) species on the surface of two-dimensional materials is a required prerequisite for the development of next-generation sensors that can provide fast and real-time detection of critically low concentrations. Here we report atomistic insights into the Lead behavior on epitaxial graphene (Gr) on silicon carbide substrates by thorough complementary study of voltammetry, electrical characterization, Raman spectroscopy, and Density Functional Theory (DFT). It is verified that the epitaxial graphene exhibits quasi-reversible anode reactions in aqueous solutions, providing a well-defined redox peak for Pb species and good linearity over a concentration range from 1 nM to 1 µM. The conductometric approach offers another way to investigate Lead adsorption, which is based on the formations of stable charge-transfer complexes affecting the p-type conductivity of epitaxial graphene. Our results suggest the adsorption ability of the epitaxial graphene towards divalent Lead ions is concentration-dependent and tends to saturate at higher concentrations. To elucidate the mechanisms responsible for Pb adsorption, we performed DFT calculations and estimated the solvent-mediated interaction between Lead species in different oxidative forms and graphene. Our results provide central information regarding the energetics and structure of Pb-graphene interacting complexes that underlay the adsorption mechanisms of neutral and divalent Lead species. Such a holistic understanding favors design and synthesis of new sensitive materials for water quality monitoring.

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Section: Introductionmentioning

confidence: 99%

Understanding Graphene Response to Neutral and Charged Lead Species: Theory and Experiment

et al. 2018

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“…The affinity constant of Pb 2+ and Hg 2+ to bind Au/Ag/ Au/CS-GO sensor was 7 × 10 5 M −1 and 4 × 10 5 M −1 , respectively. Priya et al resigned and prepared a voltammetric sensor based on graphene oxide/κ-carrageenan/lcysteine nanocomposite (GO/κ-Car/l-Cys) for the detection of Cd 2+ and Pb 2+ ions [22]. The GO/κ-Car/l-Cys composite modified with glassy carbon electrode (GCE) was successfully synthesized.…”

Section: Detection Of the Other Small Moleculesmentioning

confidence: 99%

Nanocomposite-Based Graphene for Nanosensor Applications

Cheng¹,

Ou²

2020

Nanorods and Nanocomposites

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Nanocomposites based on carbon nanomaterial particularly in graphene oxide, graphene quantum dots, and doped graphene quantum dots with improved biocompatibility have been increasing interests in the field of drug delivery, biosensor, energy, imaging and electronic. These nanomaterials as new kinds of fluorescent probes and electrochemical sensors all display ultrasmall size, good photostability, and excellent biocompatibility. In this chapter, we summarize an updated advance in the development of graphene and its related derivatives of synthesis methods and biomedical applications as nanosensors for detection of metal ions, inorganic ions, amino acids, proteins, saccharides and small molecules, drug molecules, and so on.

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“…The LOD was 1.3 µgL −1 for lead (Hwang et al, 2008). T. Priya et al prepared nanocomposite of graphene oxide/K-carrageenan/L-cysteine for the simultaneous detection of Cd 2+ and Pb 2+ , in the range from 5-50 nM for both Cd 2+ and Pb 2+ with the detection limits as 0.58 and 1.08 nM, respectively (Priya et al, 2018). Wang et al applied amination-based GO for detection lead ions in aqueous media, with the limit down to 0.1 pM; however, the negativity lies in the toxicity of Hg that used in the enrichment step of heavy metal ions .…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Sensor: L-Cysteine Induced Selectivity Enhancement of Electrochemically Reduced Graphene Oxide–Multiwalled Carbon Nanotubes Hybrid for Detection of Lead (Pb2+) Ions

et al. 2020

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A novel voltammetric sensor for the simultaneous detection of Cd2+ and Pb2+ using graphene oxide/κ-carrageenan/l-cysteine nanocomposite

Cited by 90 publications

References 35 publications

Understanding Graphene Response to Neutral and Charged Lead Species: Theory and Experiment

Understanding Graphene Response to Neutral and Charged Lead Species: Theory and Experiment

Nanocomposite-Based Graphene for Nanosensor Applications

Electrochemical Sensor: L-Cysteine Induced Selectivity Enhancement of Electrochemically Reduced Graphene Oxide–Multiwalled Carbon Nanotubes Hybrid for Detection of Lead (Pb2+) Ions

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