Facile synthesis of copper doped carbon dots and their application as a “turn-off” fluorescent probe in the detection of Fe<sup>3+</sup> ions

Xu, Quan; Wang, Rui; Wang, Jinglin; Liu, Yao; Li, Neng; Chen, Yu‐Sheng; Gao, Chun; Zhang, Wenwen; Sreeprasad, T. S.

doi:10.1039/c5ra27658f

Cited by 83 publications

(46 citation statements)

References 26 publications

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“…Nitrogen‐doped C dots from black soya beans provide high sensitivity and selectivity for the detection of Fe 3+ with static quenching characteristics . C dots obtained through hydrothermal treatment of a mixture of sodium citrate and cuprous chloride are sensitive to Fe 3+ , with LOD of 1 × 10 −9 m . Through chelation of the surface hydroxyl groups on C dots synthesized from chocolate by a hydrothermal method, lead ions (Pb 2+ ) in water were detected selectively, with LOD of 12.7 × 10 −9 m , through an electron transfer process …”

Section: Sensing and Imaging Applicationsmentioning

confidence: 99%

Recent Advances and Sensing Applications of Carbon Dots

2019

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Carbon dots (C dots) with biocompatibility, brightness, stability against photoirradiation and salt, and ease in preparation have become important materials for sensing and imaging. They can be prepared from natural materials and small organic molecules through hydrothermal, microwave‐assistant, and electrochemical methods, with advantages of simplicity and low cost. To enhance the quantum yields of C dots in the red and near‐infrared regions, doping of C dots with heteroatoms such as nitrogen and sulfur has been suggested. C dots both with and without being functionalized recognition elements such as antibodies and aptamers are selective and sensitive for sensing of analytes, including metal ions (e.g., Fe3+, Hg2+, Cu2+), small molecules (e.g., H2O2, cysteine, glutathione), and biopolymers like proteins, as well as for in vitro and in vivo imaging. Depending on the size, charge, and surface ligands of C dots used to label cells, fluorescence images of different organelles are shown. Multicolor images of bacteria, mammalian cells, and plant tissues incubated with C dots are realized when excited at different wavelengths. In this review, many excellent sensing and imaging examples of C dots are presented to highlight their features and to show their challenges for analytical applications.

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Section: Sensing and Imaging Applicationsmentioning

confidence: 99%

Recent Advances and Sensing Applications of Carbon Dots

2019

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“…For the determination of Hg 2+ , the solution of Hg 2+ with different concentration was added (150 μL, concentration range, 0-100 μM) into the above NCDs solution, mixed well and allowed to equilibrate for 1 min. After 1 min, the fluorescent intensity (I) of the samples was measured respectively [30]. When detecting for Ag + , the same procedure was followed for Hg 2+ ions.…”

Section: Detection Of Ionsmentioning

confidence: 99%

One pot synthesis of highly fluorescent N doped C-dots and used as fluorescent probe detection for Hg2+ and Ag+ in aqueous solution

Ren

Zhang

et al. 2017

Sensors and Actuators B: Chemical

105

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A kind of biocompatible fluorescent nitrogen doped carbon quantum dots (NCDs) has been synthesized using uric acid as raw material through a facile, effective and green thermal treatment method in one pot. The surface morphology and optical properties of the synthesized NCDs were characterized. Without further chemical modification, the NCDs emit bright blue fluorescence with a high quantum yield of 56% due to the enhancement effect of N dopant atoms on a surface of carbon quantum dots. Owing to the strong blue fluorescence, negligible toxicity and the special response of heavy metal ions, the NCDs have been used as a fluorescence probe for sensitive and selective detection of Hg 2+ and Ag + ions with detection limit of 4.8 nM and 1 nM, respectively. Moreover, it was successfully applied to determination of Hg 2+ and Ag + in real environmental water samples, which offers the advantages of simplicity and cost efficiency.

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“…1, 2 There is continued interest in CNDs because of their physicochemical properties of good solubility, low toxicity, and biocompatibility, along with their favorable optoelectronic properties of strong fluorescence, phosphorescence, chemiluminescence, and photoinduced electron transfer. 2–6 As such, CNDs have been found to have potential applications in biomedicine (bioimaging, biosensor, and biomedicine delivery system), chemical sensing, and photoelectric devices (solar cells, supercapacitor, photocatalysis and light-emitting devices). 2–4 For the mechanism for light emission in CNDs, 7, 8 some workers have proposed that the bandgap transitions responsible for fluorescence arise from conjugated π-domains consisting of sp 2 hybridized islands rich in π-electrons, bond disorder induced energy gaps, 9, 10 or giant red-edge effects that give rise to strong excitation wavelength dependent fluorescence.…”

Section: Introductionmentioning

confidence: 99%

A fluorescence-electrochemical study of carbon nanodots (CNDs) in bio- and photoelectronic applications and energy gap investigation

Zeng

Zhang

Arvapalli

et al. 2017

Phys. Chem. Chem. Phys.

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Carbon nanodots (CNDs) have attracted great attention due to their superior solubility, biocompatibility, tunable photoluminescence, and opto-electronic properties. This work describes a new fluorescence-based spectroelectrochemistry approach to simultaneously study the photoluminescence and wavelength dependent photocurrent of microwave synthesized CNDs. The fluorescence of CNDs has a selective quench upon a reversible redox couple, ferricyanide/ferrocyanide,− reaction during the cyclic voltammetry. The CNDs modified gold slide electrode demonstrates wavelength dependent photocurrent generation during the fluorescence-electrochemical study, suggesting potential application in photoelectronics. UV-Vis absorption and electrochemistry are used to quantify the energy gap of the CNDs, and then to calibrate a Hückel model for the CNDs electronic energy levels. The Hückel (or tight binding) model treatment of an individual CND as a molecule combines the conjugated π states (C=C) with the functional groups (C=O, C-O, and COOH) associated with the surface electronic states. This experimental and theoretical investigation of the CNDs provides a new perspective on the optoelectronic properties of CNDs and should aid in their development for practical use in biomedicine, chemical sensing, and photoelectric devices.

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Facile synthesis of copper doped carbon dots and their application as a “turn-off” fluorescent probe in the detection of Fe³⁺ ions

Abstract: Cu-doped carbon dots were synthesized by a one-step hydrothermal method and used as a “turn-off” fluorescent probe in the detection of Fe3+ ions.

Cited by 83 publications

References 26 publications

Recent Advances and Sensing Applications of Carbon Dots

Recent Advances and Sensing Applications of Carbon Dots

One pot synthesis of highly fluorescent N doped C-dots and used as fluorescent probe detection for Hg2+ and Ag+ in aqueous solution

A fluorescence-electrochemical study of carbon nanodots (CNDs) in bio- and photoelectronic applications and energy gap investigation

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Facile synthesis of copper doped carbon dots and their application as a “turn-off” fluorescent probe in the detection of Fe3+ ions

Abstract: Cu-doped carbon dots were synthesized by a one-step hydrothermal method and used as a “turn-off” fluorescent probe in the detection of Fe3+ ions.

Cited by 83 publications

References 26 publications

Recent Advances and Sensing Applications of Carbon Dots

Recent Advances and Sensing Applications of Carbon Dots

One pot synthesis of highly fluorescent N doped C-dots and used as fluorescent probe detection for Hg2+ and Ag+ in aqueous solution

A fluorescence-electrochemical study of carbon nanodots (CNDs) in bio- and photoelectronic applications and energy gap investigation

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Facile synthesis of copper doped carbon dots and their application as a “turn-off” fluorescent probe in the detection of Fe³⁺ ions