A green synthesis of highly fluorescent nitrogen-doped graphene quantum dots for the highly sensitive and selective detection of mercury(<scp>ii</scp>) ions and biothiols

Yan, Zhengyu; Qu, Xincheng; Niu, Qianqian; Tian, Chunqing; Fan, Chuanjian; Ye, Baofen

doi:10.1039/c5ay03208c

Cited by 74 publications

(32 citation statements)

References 43 publications

(44 reference statements)

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“…We anticipate that this understanding will importantly advance the research on GQD-based sensing devices. The choice of GQDs as a representative of the graphene-family materials is justified by the fact that GQD-related systems are multifunctional platforms, which can be used for production of micron-sized solid sheets (a promising working electrode material for electrochemical detection of heavy metals), 68 catalysts accelerating the reaction with HMs, 69 modified working electrodes, 70,71 aqueous solution electrolytes for optical and colorimetric detection of heavy metals [72][73][74][75][76][77][78][79][80][81][82] and adsorbent agents for removal of heavy metals. [83][84][85]…”

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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“…This fluorescent "Off-On" process displayed a sensitive response to biothiols with a detection limit of 0.036 μM for cysteine and 0.034 μM for glutathione. The N-graphene quantum dot-based fluorescence method has been successfully used to monitor Hg 2+ in real water samples and biothiols in serum samples (Yan et al 2016).…”

Section: Eco-friendly and Sustainable Synthesis Of Graphene Quantum Dotsmentioning

confidence: 99%

Green synthesis, biomedical and biotechnological applications of carbon and graphene quantum dots. A review

2020

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Carbon and graphene quantum dots are prepared using top-down and bottom-up methods. Sustainable synthesis of quantum dots has several advantages such as the use of low-cost and non-toxic raw materials, simple operations, expeditious reactions, renewable resources and straightforward post-processing steps. These nanomaterials are promising for clinical and biomedical sciences, especially in bioimaging, diagnosis, bioanalytical assays and biosensors. Here we review green methods for the fabrication of quantum dots, and biomedical and biotechnological applications.

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“…Similar to other nanoparticles or semiconductor quantum dots, fluorescence carbon dots (CDs) have also been widely researched as a high fluorescent probe because of their excellent photostability, low toxicity, and favorable biocompatibility . Compared with other enzyme‐based sensors that depend on environmental conditions, fluorescence CDs have been found to have an excellent sensing ability because of their excellent properties such as environmental friendliness, low toxicity, and high solubility.…”

Section: Introductionmentioning

confidence: 99%

“…Similar to other nanoparticles or semiconductor quantum dots, 14 fluorescence carbon dots (CDs) have also been widely researched as a high fluorescent probe because of their excellent photostability, low toxicity, and favorable biocompatibility. [15][16][17] Compared with other enzyme-based sensors that depend on environmental conditions, fluorescence CDs have been found to have an excellent sensing ability because of their excellent properties such as environmental friendliness, low toxicity, and high solubility. Various synthesis techniques such as microwave synthesis, 1,18 electrochemical, 19 sol-gel polymerization, 20 laser ablation, 21 chemical oxidation, 22 thermolysis, 23 and ultrasonic method 24 have been developed for the preparation of fluorescence CDs.…”

Section: Introductionmentioning

confidence: 99%

Crown daisy leaf waste–derived carbon dots: A simple and green fluorescent probe for copper ion

Wang

et al. 2019

Surface & Interface Analysis

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In this paper, N‐doped carbon quantum dots (N‐CDs) were fabricated using crown daisy leaves, a kitchen waste, as carbon source. The synthesized N‐CDs possessed abundant surface functional groups, such as hydroxyl, carboxyl, and amino groups, and had good dispersibility in water. Because of the special fluorescence quenching property toward Cu2+, the synthesized N‐CDs can be exploited as an effective label‐free fluorescent probe for Cu2+ determination. The possible fluorescence sensing mechanism considered the selective coordination interaction between Cu2+ ion and the hydroxyl, carboxyl, and amino groups of the N‐CDs. The control experiments also showed that the N‐doped aromatic C–N heterocycle structure played a crucial role in selective sensing of Cu2+. The decrease in fluorescence efficiencies was linearly related with the Cu2+ concentrations in the range of 10.0nM to 120.0nM, with a response limit of 1.0nM. The prepared probe was also applied for Cu2+ determination in real river water.

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A green synthesis of highly fluorescent nitrogen-doped graphene quantum dots for the highly sensitive and selective detection of mercury(ii) ions and biothiols

Abstract: A green synthesis of nitrogen-doped GQDs for the detection of mercury(ii) ions and biothiols.

Cited by 74 publications

References 43 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

Green synthesis, biomedical and biotechnological applications of carbon and graphene quantum dots. A review

Crown daisy leaf waste–derived carbon dots: A simple and green fluorescent probe for copper ion

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