Nitrogen and sulfur codoped graphene quantum dots as a new fluorescent probe for Au<sup>3+</sup> ions in aqueous media

Yang, Tingting; Cai, Fei; Zhang, Xiaodan; Huang, Yuming

doi:10.1039/c5ra20060a

Cited by 37 publications

(8 citation statements)

References 48 publications

(69 reference statements)

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“…The top-down methods are based on breaking large carbon structures, such as graphene, graphene oxide, or fullerenes, into nanoparticles using physical or chemical means, for instance, acid oxidation, electrochemical, and hydrothermal . In the bottom-up routes, GQDs are formed from organic precursors with good controllability, in which nitrogen doping is one of the most common strategies to improve GQD optical properties …”

Section: Introductionmentioning

confidence: 99%

Exploring the Emission Pathways in Nitrogen-Doped Graphene Quantum Dots for Bioimaging

et al. 2021

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Graphene quantum dots (GQDs) with tunable fluorescence emission promise excellent bioapplication potential, especially in bioimaging. We report the synthesis of nitrogen-doped GQDs (N-GQDs) from glucose and ethylenediamine, cheap and safe chemicals, using a one-step and fast microwave-assisted hydrothermal method. Our N-GQDs exhibit fluorescence in the entire visible spectral region, which extends to near-ultraviolet and slightly to near-infrared. Since the origin of fluorescence and its relation to the structure and synthesis conditions are not yet fully understood, we also concentrated on the fluorescence mechanism explanation. Structural characterization with steady-state and time-resolved photoluminescence measurements indicated that bandto-band transitions, size effect, and different nitrogen and oxygen functional groups play a role in this multicolor emission. Remarkably, we found for the first time the evidence that directly relates a change in the N-GQD work function to the change in oxygen groups under UV irradiation via ultraviolet photoelectron spectroscopy. Thus, we confirmed that for λ ex ≲ 380 nm, photooxidation processes occurred, which led to chemical modification, thereby lowering the work function in the N-GQDs. The N-GQDs were proved to be highly biocompatible by a cell viability assay using vascular smooth muscle cells. Together with the wide spectral range emission observed in confocal fluorescence imaging, it demonstrated the potential of the N-GQDs for in vitro bioimaging applications.

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Section: Introductionmentioning

confidence: 99%

Exploring the Emission Pathways in Nitrogen-Doped Graphene Quantum Dots for Bioimaging

et al. 2021

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“…Au 3+ ions, a notable heavy metal, have received great attention in chemistry and biology during recent decades and have been widely used in gold plating, 1 environmental studies, 2 anticancer agents, 3 nanomaterials, efficient catalysts, biological sensors, and drug/gene delivery systems based on their unique chemical properties and high biocompatibility. 4−7 In addition, these ions have also been developed for application in the jewelry industry.…”

Section: Introductionmentioning

confidence: 99%

“…Au 3+ ions, a notable heavy metal, have received great attention in chemistry and biology during recent decades and have been widely used in gold plating, environmental studies, anticancer agents, nanomaterials, efficient catalysts, biological sensors, and drug/gene delivery systems based on their unique chemical properties and high biocompatibility. − In addition, these ions have also been developed for application in the jewelry industry . Studies have shown that Au 3+ ions can be used to prepare reduced graphene oxide/Au nanoparticles (NPs), drugs, and catalysts to detect dopamine, ascorbic acid, and uric acid; to treat tuberculosis and rheumatoid arthritis; and to activate carbon–carbon triple bonds. − Although Au 3+ ions have versatile roles in materials science and biological systems, studies have demonstrated that Au 3+ ion-based drugs exhibit potential toxicity at certain concentrations .…”

Section: Introductionmentioning

confidence: 99%

Novel Amino-pillar[5]arene as a Fluorescent Probe for Highly Selective Detection of Au³⁺ Ions

Yang

Xun

et al. 2019

ACS Omega

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A novel fluorescent probe, amino-pillar[5]arene (APA), was prepared via a green, effective, and convenient synthetic method, which was characterized by nuclear magnetic resonance (NMR), infrared (IR), and high-resolution mass spectrometry. The fluorescence sensing behavior of the APA probe toward 22 metal ions in aqueous solutions were studied by fluorescence spectroscopy. The results showed that APA could be used as a selective fluorescent probe for the specificity detection of Au3+ ions. Moreover, the detection characteristics were investigated by fluorescence spectral titration, pH effect, fluorescence competitive experiments, Job’s plot analysis, 1H NMR, and IR. The results indicated that detection of Au3+ ions by the APA probe could be achieved in the range of pH 1–13.5 and that other coexisting metal ions did not cause any marked interference. The titration analysis results indicated that the fluorescence intensity decreased as the concentration of Au3+ ions increased, with an excellent correlation (R2 = 0.9942). The detection limit was as low as 7.59 × 10–8 mol·L–1, and the binding ratio of the APA probe with Au3+ ions was 2:1. Therefore, the APA probe has potential applications for detecting Au3+ ions in the environment and in living organisms.

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“…The statistic result from TEM image indicated that the particle sizes were 2–7 nm, as shown in the inset of Figure 1 a. From the HRTEM image in Figure 1 b, clear lattice fringes demonstrate the well-crystalline structure, and the autocorrelated HRTEM lattice image shows a 0.227-nm lattice fringe assigned to the (1120) lattice fringes of graphene [ 33 , 34 ].…”

Section: Resultsmentioning

confidence: 99%

D-GQDs Modified Epoxy Resin Enhances the Thermal Conductivity of AlN/Epoxy Resin Thermally Conductive Composites

et al. 2021

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This article proposes a method of increasing thermal conductivity (λ) by improving the λ value of a matrix and reducing the interfacial thermal resistance between such matrix and its thermally conductive fillers. D-GQDs (graphene quantum dots modified by polyetheramine D400) with a π–π-conjugated system in the center of their molecules, and polyether branched chains that are rich in amino groups at their edges, are designed and synthesized. AlN/DG-ER (AlN/D-GQDs-Epoxy resin) thermally conductive composites are obtained using AlN as a thermally conductive and insulating filler, using D-GQDs-modified epoxy resin as a matrix. All of the thermal conductivity, electrically insulating and physical–mechanical properties of AlN/DG-ER are investigated in detail. The results show that D-GQDs linked to an epoxy resin by chemical bonds can increase the value of λ of the epoxy–resin matrix and reduce the interfacial thermal resistance between AlN and DG-ER (D-GQDs–epoxy resin). The prepared AlN/DG-ER is shown to be a good thermally conductive and insulating packaging material.

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Nitrogen and sulfur codoped graphene quantum dots as a new fluorescent probe for Au³⁺ ions in aqueous media

Abstract: The N and S codoped GQDs can be used as a promising label free fluorescent probe for the sensitive and selective detection of Au3+ in aqueous media, which provides a new application of the functionalized GQDs to the detection of metal ions.

Cited by 37 publications

References 48 publications

Exploring the Emission Pathways in Nitrogen-Doped Graphene Quantum Dots for Bioimaging

Exploring the Emission Pathways in Nitrogen-Doped Graphene Quantum Dots for Bioimaging

Novel Amino-pillar[5]arene as a Fluorescent Probe for Highly Selective Detection of Au³⁺ Ions

D-GQDs Modified Epoxy Resin Enhances the Thermal Conductivity of AlN/Epoxy Resin Thermally Conductive Composites

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Nitrogen and sulfur codoped graphene quantum dots as a new fluorescent probe for Au3+ ions in aqueous media

Abstract: The N and S codoped GQDs can be used as a promising label free fluorescent probe for the sensitive and selective detection of Au3+ in aqueous media, which provides a new application of the functionalized GQDs to the detection of metal ions.

Cited by 37 publications

References 48 publications

Exploring the Emission Pathways in Nitrogen-Doped Graphene Quantum Dots for Bioimaging

Exploring the Emission Pathways in Nitrogen-Doped Graphene Quantum Dots for Bioimaging

Novel Amino-pillar[5]arene as a Fluorescent Probe for Highly Selective Detection of Au3+ Ions

D-GQDs Modified Epoxy Resin Enhances the Thermal Conductivity of AlN/Epoxy Resin Thermally Conductive Composites

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Nitrogen and sulfur codoped graphene quantum dots as a new fluorescent probe for Au³⁺ ions in aqueous media

Novel Amino-pillar[5]arene as a Fluorescent Probe for Highly Selective Detection of Au³⁺ Ions