A review of graphene composite-based sensors for detection of heavy metals

Yang, Zhiyu; Dai, Ningning; Lu, Ran; Huang, Zheng‐Hong; Kang, Feiyu

doi:10.1016/j.carbon.2015.12.055

Cited by 5 publications

(3 citation statements)

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“…as possible candidates for conceptualization of both sensors and adsorbents. [36][37][38][39][40][41] Being a two-dimensional (2D) monoatomic sheet of sp 2conjugated carbon atoms, 42 graphene possesses unprecedentedly high sensitivity towards detection of individual atoms and molecules adsorbed onto its planar surface. 43 The basic physics underlying such detection is related to the possibility of local modulation of the charge-transfer reactions.…”

Section: Introductionmentioning

confidence: 99%

Interband transitions in closed-shell vacancy containing graphene quantum dots complexed with heavy metals

Shtepliuk

Yakimova

2018

Phys. Chem. Chem. Phys.

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High-performance optical detection of toxic heavy metals by using graphene quantum dots (GQDs) requires a strong interaction between the metals and GQDs, which can be reached through a functionalization/immobilization procedure or doping effect. However, commonly used surface activation approaches induce toxicity into the analysis system and, therefore, are ineligible from the environmental point of view. Here, we show that artificial creation of vacancy-type defects in GQDs can be a helpful means of intentional control of the active sites available for reaction with cadmium (Cd), mercury (Hg) and lead (Pb). Using restricted density functional theory (DFT) and time-dependent DFT (TD-DFT) methods, we predict the effect of vacancy complexes not previously studied to describe the binding ability of GQDs towards metal adsorbates. We also show that the interband absorption in closed-shell GQDs complexed with Cd, Hg and Pb is strongly dependent on the vacancy type and can be efficiently tuned to attain the desired coloration of the analysis system. The results suggest that the vacancy defects play an important role in governing the hybridization between locally-excited (LE) and charge-transfer (CT) states of the GQDs. Based on the molecular orbital analysis and in-depth knowledge of excited states, the mechanisms underlying the interband absorption are discussed.

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Section: Introductionmentioning

confidence: 99%

Interband transitions in closed-shell vacancy containing graphene quantum dots complexed with heavy metals

Shtepliuk

Yakimova

2018

Phys. Chem. Chem. Phys.

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“…Besides, the M 2 B‐type borides of Fe–Cr–B cast steel greatly inhibited the Fe and Al diffusion reaction and significantly improved the corrosion resistance. [ 29 ] Besides, Wang et al [ 30 ] suggested that the orientation relationship of Fe 2 B in Fe–B alloys had an essential influence on dissolution, transformation, fracture, and exfoliation. The fracture and exfoliation of Fe 2 B occurred when the orientation was parallel to the interface, and the Fe 2 B–FeB transition occurred when the orientation was perpendicular to the interface.…”

Section: Resultsmentioning

confidence: 99%

Erosion mechanism of austenitic steel and martensitic steel in aluminum alloy melt

Bai

Yang

et al. 2022

Materials & Corrosion

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Due to the washout of aluminum alloy melt, the erosion failure of steel is a complex problem in die casting. To explain the erosion mechanism in flowing aluminum alloy melt, 6Mn14Cr3Mo2Si1V2 steel, and 4Cr5Mo2V steel were stirred at 700°C in ADC12 melt. The erosion characteristics were studied via the scanning electron microscope. At the test time increased from 600 to 1800 s, the weight loss rate of 6Mn14Cr3Mo2Si1V2 steel increased from 5.0% to 14.1%, and the weight loss rate of 4Cr5Mo2V steel increased from 5.4% to 12.8%. If the corrosion time reaches more than 1200 s, 6Mn14Cr3Mo2Si1V2 steel has lower erosion resistance because intergranular corrosion causes the matrix to peel off. Besides, the lump-like Vanadium carbides with a low erosion rate act as obstacles to prevent the invasion of aluminum alloy melt. The reaction product of steel and aluminum alloy melt is identified as

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“…[21][22][23][24][25] It was reported that graphene composited with polymers, [26][27][28] noble metal, 21,29 and metal oxide nanoparticles exhibited much more superior comprehensive properties and broader application prospects compared to graphene. [30][31][32] Moreover, PEDT was known as an admirable conductive polymer with widely applications in many elds, such as sensors, capacitors, solar battery and electrochromic devices, because of its superior electrical conductivity and high electrochemical stability.…”

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confidence: 99%

A highly sensitive morin sensor based on PEDT–Au/rGO nanocomposites modified glassy carbon electrode

et al. 2017

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In this work, we fabricated a sensitive electrochemical sensor based on a PEDT-Au/reduced graphene oxide nanocomposites (PEDT-Au/rGO) modified glassy carbon electrode (PEDT-Au/rGO/GCE) for electrochemical determination of morin. A facile, effective and high-efficiency one-pot method was employed to synthesize the PEDT-Au/rGO nanocomposites. The morphology and structure of asprepared PEDT-Au/rGO nanocomposites were characterized by using a scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray spectroscopy (EDS), and its electrochemical characteristics were studied by EIS, CV and SWV. The PEDT-Au/rGO nanocomposites modified electrode exhibited excellent catalytic activities for morin oxidation, which was attributed to the synergistic catalytic effect that occurred at the interface of PEDT-Au and rGO layers. The effects of square wave voltammetry (SWV) parameters, accumulation time, accumulation potential and pH of the supporting electrolyte for morin were optimized. At the optimal experimental conditions, the PEDTAu/rGO/GCE presented a high sensitivity of 0.0083 mmol dm À3 and a wide linear range from 1 to 150 mmol dm À3 toward morin oxidation with satisfactory selectivity and stability.

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A review of graphene composite-based sensors for detection of heavy metals

Cited by 5 publications

References 0 publications

Interband transitions in closed-shell vacancy containing graphene quantum dots complexed with heavy metals

Interband transitions in closed-shell vacancy containing graphene quantum dots complexed with heavy metals

Erosion mechanism of austenitic steel and martensitic steel in aluminum alloy melt

A highly sensitive morin sensor based on PEDT–Au/rGO nanocomposites modified glassy carbon electrode

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