Highly fluorescent carbon dots as selective and visual probes for sensing copper ions in living cells via an electron transfer process

Wang, Jian; Li, Rong Sheng; Zhang, Hong Zhi; Ni, Wang; Zhang, Zheng; Huang, Cheng

doi:10.1016/j.bios.2017.05.035

Cited by 181 publications

(66 citation statements)

References 38 publications

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“…In this study, microwave-assisted thermal decomposition method with poly(ethylene imine) (PEI) as carbon source and levofloxacin as a co-reactant was used to prepare F,N-doped CDs (Figure 1 The spacing of the lattice fringe is 0.34 nm, corresponding to the (002) plane of graphitic carbon. [17] Figure 1 d shows the XRD pattern of F,N-doped CDs with a broad diffraction peak centered at about 2q = 238, which matches with interlayer distance of graphite (0.347 nm) and agrees well with the above-mentioned HRTEM result. [2a, 5c, 18] The diffraction broadening is originated from the amorphous phase in the sample such as organic surface groups on the F,N-doped CDs.…”

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confidence: 82%

Photoactivated Fluorescence Enhancement in F,N‐Doped Carbon Dots with Piezochromic Behavior

et al. 2019

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Photoactivation in CdSe/ZnS quantum dots (QDs) on UV/Vis light exposure improves photoluminescence (PL) and photostability. However, it was not observed in fluorescent carbon quantum dots (CDs). Now, photoactivated fluorescence enhancement in fluorine and nitrogen co‐doped carbon dots (F,N‐doped CDs) is presented. At 1.0 atm, the fluorescence intensity of F,N‐doped CDs increases with UV light irradiation (5 s–30 min), accompanied with a blue‐shift of the fluorescence emission from 586 nm to 550 nm. F,N‐doped CDs exhibit photoactivated fluorescence enhancement when exposed to UV under high pressure (0.1 GPa). F,N‐doped CDs show reversible piezochromic behavior while applying increasing pressure (1.0 atm to 9.98 GPa), showing a pressure‐triggered aggregation‐induced emission in the range 1.0 atm–0.65 GPa. The photoactivated CDs with piezochromic fluorescence enhancement broadens the versatility of CDs from ambient to high‐pressure conditions and enhances their anti‐photobleaching.

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confidence: 82%

Photoactivated Fluorescence Enhancement in F,N‐Doped Carbon Dots with Piezochromic Behavior

et al. 2019

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“…Previous reports showed that the mechanism of fluorescence quenching of the N-CDs by Hg 2+ was related to an inner filter effect [ 60 ], aggregation induction [ 61 ], or electron transfer [ 62 ]. To help determine the mechanism behind these effects, we conducted an investigation using fluorescence lifetime and cyclic voltammetry (CV) studies.…”

Section: Resultsmentioning

confidence: 99%

Highly Photoluminescent and Stable N-Doped Carbon Dots as Nanoprobes for Hg2+ Detection

Rao

Tang

et al. 2018

Nanomaterials

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We developed a microreactor with porous copper fibers for synthesizing nitrogen-doped carbon dots (N-CDs) with a high stability and photoluminescence (PL) quantum yield (QY). By optimizing synthesis conditions, including the reaction temperature, flow rate, ethylenediamine dosage, and porosity of copper fibers, the N-CDs with a high PL QY of 73% were achieved. The PL QY of N-CDs was two times higher with copper fibers than without. The interrelations between the copper fibers with different porosities and the N-CDs were investigated using X-ray photoelectron spectroscopy (XPS) and Fourier Transform infrared spectroscopy (FTIR). The results demonstrate that the elemental contents and surface functional groups of N-CDs are significantly influenced by the porosity of copper fibers. The N-CDs can be used to effectively and selectively detect Hg2+ ions with a good linear response in the 0~50 μM Hg2+ ions concentration range, and the lowest limit of detection (LOD) is 2.54 nM, suggesting that the N-CDs have great potential for applications in the fields of environmental and hazard detection. Further studies reveal that the different d orbital energy levels of Hg2+ compared to those of other metal ions can affect the efficiency of electron transfer and thereby result in their different response in fluorescence quenching towards N-CDs.

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“…Besides the high quantum yield and adjustable emission wavelength, which are also possessed by traditional semiconductor quantum dots, C-dots have many other excellent characteristics, including good photostability, low cytotoxicity, good biocompatibility, easy surface modification and high chemical inertness, and therefore have attracted considerable scholarly attention in recent years. Hence far, C-dots have been widely used in many fields such as cell imaging [3][4][5], in vivo imaging [6,7], drug delivery [8][9][10], fluorescence sensing [11][12][13], photocatalysis [14][15][16], multicolor light-emitting diode (LED) production [17,18], energy conversion and storage [19][20][21], etc. C-dots are gradually become one of the research hotspots in the above-mentioned fields and considered as a potential substitute for semiconductor quantum dots.…”

Section: Introductionmentioning

confidence: 99%

A Review of Carbon Dots Produced from Biomass Wastes

et al. 2020

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The fluorescent carbon dot is a novel type of carbon nanomaterial. In comparison with semiconductor quantum dots and fluorescence organic agents, it possesses significant advantages such as excellent photostability and biocompatibility, low cytotoxicity and easy surface functionalization, which endow it a wide application prospect in fields of bioimaging, chemical sensing, environmental monitoring, disease diagnosis and photocatalysis as well. Biomass waste is a good choice for the production of carbon dots owing to its abundance, wide availability, eco-friendly nature and a source of low cost renewable raw materials such as cellulose, hemicellulose, lignin, carbohydrates and proteins, etc. This paper reviews the main sources of biomass waste, the feasibility and superiority of adopting biomass waste as a carbon source for the synthesis of carbon dots, the synthetic approaches of carbon dots from biomass waste and their applications. The advantages and deficiencies of carbon dots from biomass waste and the major influencing factors on their photoluminescence characteristics are summarized and discussed. The challenges and perspectives in the synthesis of carbon dots from biomass wastes are also briefly outlined.

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Highly fluorescent carbon dots as selective and visual probes for sensing copper ions in living cells via an electron transfer process

Cited by 181 publications

References 38 publications

Photoactivated Fluorescence Enhancement in F,N‐Doped Carbon Dots with Piezochromic Behavior

Photoactivated Fluorescence Enhancement in F,N‐Doped Carbon Dots with Piezochromic Behavior

Highly Photoluminescent and Stable N-Doped Carbon Dots as Nanoprobes for Hg2+ Detection

A Review of Carbon Dots Produced from Biomass Wastes

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