Preparation of graphene quantum dots based core-satellite hybrid spheres and their use as the ratiometric fluorescence probe for visual determination of mercury(II) ions

Hua, Mengjuan; Wang, Chengquan; Qian, Jing; Wang, Kan; Yang, Zeyuan; Liu, Qian; Mao, Hanping; Wang, Kun

doi:10.1016/j.aca.2015.07.042

Cited by 46 publications

(9 citation statements)

References 55 publications

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“…Upon the addition of Hg 2+ , the fluorescence emission of GQDs was quenched, with gradual colors changing from blue to red, resulting from a strong affinity between Hg 2+ and the carboxylic and hydroxyl groups in GQDs. A linear relationship in the range of 0.01 µM to 22 µM with a detection limit of 3.3 nM was obtained [52].…”

Section: Incorporation Of Graphene Quantum Dots With Optical Sensomentioning

confidence: 99%

Development of Graphene Quantum Dots-Based Optical Sensor for Toxic Metal Ion Detection

Anas

Fen

Omar

et al. 2019

Sensors

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About 71% of the Earth’s surface is covered with water. Human beings, animals, and plants need water in order to survive. Therefore, it is one of the most important substances that exist on Earth. However, most of the water resources nowadays are insufficiently clean, since they are contaminated with toxic metal ions due to the improper disposal of pollutants into water through industrial and agricultural activities. These toxic metal ions need to be detected as fast as possible so that the situation will not become more critical and cause more harm in the future. Since then, numerous sensing methods have been proposed, including chemical and optical sensors that aim to detect these toxic metal ions. All of the researchers compete with each other to build sensors with the lowest limit of detection and high sensitivity and selectivity. Graphene quantum dots (GQDs) have emerged as a highly potential sensing material to incorporate with the developed sensors due to the advantages of GQDs. Several recent studies showed that GQDs, functionalized GQDs, and their composites were able to enhance the optical detection of metal ions. The aim of this paper is to review the existing, latest, and updated studies on optical sensing applications of GQDs-based materials toward toxic metal ions and future developments of an excellent GQDs-based SPR sensor as an alternative toxic metal ion sensor.

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Section: Incorporation Of Graphene Quantum Dots With Optical Sensomentioning

confidence: 99%

Development of Graphene Quantum Dots-Based Optical Sensor for Toxic Metal Ion Detection

Anas

Fen

Omar

et al. 2019

Sensors

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show abstract

“…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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“…The recovery rates were calculated in the range of 97.0 ± 3.5–99.2% ± 2.1%. In comparison to the previous reported methods, this developed FI‐CL system achieved sensitive and rapid detection of Hg 2+ (Table ). The results indicated that these Pt NPs‐luminol CL system would be the potential system for monitoring Hg 2+ in polluted water.…”

Section: Resultsmentioning

confidence: 88%

Pt NPs catalyzed chemiluminescence method for Hg²⁺ detection based on a flow injection system

Zheng

Zhao

et al. 2019

Electrophoresis

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Establishing a simple and accurate method for Hg2+ detection is of great importance for the environment and human health. In this work, platinum nanoparticles (Pt NPs) with different capped agents and morphologies were synthesized. It was found that Pt NPs exhibited peroxidase‐like activity that can catalyze the chemiluminescence (CL) of the luminol system without H2O2. The most intensive CL signals were obtained by using PVP‐capped Pt NPs as catalysis. Based on the fact that Hg2+ could further enhance the CL intensity in the Pt NPs‐luminol CL system, a Pt NPs‐catalyzed CL method based on a flow injection system is developed for the sensitive analysis of Hg2+. When the concentration of Hg2+ in the system increases, the CL intensity would together increase, thereby achieving sensitive Hg2+ detection. The limit of detection (LOD) was calculated to be 8.6 nM. This developed method provides a simple and rapid approach for the sensitive detection of Hg2+ and shows great promise for applications in other complex systems.

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Preparation of graphene quantum dots based core-satellite hybrid spheres and their use as the ratiometric fluorescence probe for visual determination of mercury(II) ions

Cited by 46 publications

References 55 publications

Development of Graphene Quantum Dots-Based Optical Sensor for Toxic Metal Ion Detection

Development of Graphene Quantum Dots-Based Optical Sensor for Toxic Metal Ion Detection

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

Pt NPs catalyzed chemiluminescence method for Hg²⁺ detection based on a flow injection system

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Preparation of graphene quantum dots based core-satellite hybrid spheres and their use as the ratiometric fluorescence probe for visual determination of mercury(II) ions

Cited by 46 publications

References 55 publications

Development of Graphene Quantum Dots-Based Optical Sensor for Toxic Metal Ion Detection

Development of Graphene Quantum Dots-Based Optical Sensor for Toxic Metal Ion Detection

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

Pt NPs catalyzed chemiluminescence method for Hg2+ detection based on a flow injection system

Contact Info

Product

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Pt NPs catalyzed chemiluminescence method for Hg²⁺ detection based on a flow injection system