Controllable electrochemical/electroanalytical approach to generate nitrogen-doped carbon quantum dots from varied amino acids: pinpointing the utmost quantum yield and the versatile photoluminescent and electrochemiluminescent applications

Niu, Fushuang; Xu, Yuanhong; Liu, Jixian; Song, Zhitang; Liu, Mengli; Liu, Jingquan

doi:10.1016/j.electacta.2017.03.085

Cited by 68 publications

(40 citation statements)

References 67 publications

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“…In contrast to the top-down methods, bottom-up ones are adopted for CQDs production through passivation, carbonization, electro-oxidation and electro-polymerization from small 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 molecular precursors such as ethanol, [39] nitriles, [40] amino acid [41] and sodium citrate/urea. [42] However, CQDs synthesized via the bottom-up EC methods are less reported than expected since special and green precursors have to be appropriately selected to make sure the as-prepared CQDs be non-toxic and biocompatible ( Table 2).…”

Section: Bottom-up Methodsmentioning

confidence: 99%

“…[39a] Besides, multifunctional N-CQDs with blue fluorescence and higher QY of 46.2% were synthesized from various amino acids as the green carbon source. [41] Moreover, the EC method can not only be used as a synthesis method, but also can accurately determine the optimum reaction time for generating N-CQDs with utmost QY during the EC process, Wahaha water (mineral water)…”

Section: Bottom-up Methodsmentioning

confidence: 99%

“…CQDs can also be prepared with glycine as precursors in aqueous solution under alkaline conditions via an EC approach . Besides, multifunctional N‐CQDs with blue fluorescence and higher QY of 46.2% were synthesized from various amino acids as the green carbon source . Moreover, the EC method can not only be used as a synthesis method, but also can accurately determine the optimum reaction time for generating N‐CQDs with utmost QY during the EC process, which further confirms the simplicity and effectiveness of the EC synthesis method.…”

Section: Electrosynthesis Methods Of the Cqdsmentioning

confidence: 99%

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Electrochemistry in Carbon‐based Quantum Dots

Ding

Niu

Zhang

et al. 2020

Chemistry An Asian Journal

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Electrochemistry belongs to an important branch of chemistry that deals with the chemical changes produced by electricity and the production of electricity by chemical changes. Therefore, it can not only act a powerful tool for materials synthesis, but also offer an effective platform for sensing and catalysis. As extraordinary zero-dimensional materials, carbon-based quantum dots (CQDs) have been attracting tremendous attention due to their excellent properties such as good chemical stability, environmental friendliness, nontoxicity and abundant resources. Compared with the traditional methods for the preparation of CQDs, electrochemical (EC) methods offer advantages of simple instrumentation, mild reaction conditions, low cost and mass production. In return, CQDs could provide cost-effective, environmentally friendly, biocompatible, stable and easilyfunctionalizable probes, modifiers and catalysts for EC sensing. However, no specific review has been presented to systematically summarize both aspects until now. In this review, the EC preparation methods of CQDs are critically discussed focusing on CQDs. We further emphasize the applications of CQDs in EC sensors, electrocatalysis, biofuel cells and EC flexible devices. This review will further the experimental and theoretical understanding of the challenges and future prospective in this field, open new directions on exploring new advanced CQDs in EC to meet the high demands in diverse applications.[a] Dr.

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Section: Bottom-up Methodsmentioning

confidence: 99%

Section: Bottom-up Methodsmentioning

confidence: 99%

Section: Electrosynthesis Methods Of the Cqdsmentioning

confidence: 99%

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Electrochemistry in Carbon‐based Quantum Dots

Ding

Niu

Zhang

et al. 2020

Chemistry An Asian Journal

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“…The observed emission quantum yields for CZnS dots and CTiO 2 dots were up to 78% and 70%, respectively [35]. A kind of nitrogen-doped carbon dot with the utmost quantum yield (46.2%) was generated through a three-electrode EC system by Niu et al for photoluminescent and electrochemiluminescent applications [36]. The sulfur-doped carbon dots with a high quantum yield (58%) synthesized via a microwave-assisted pyrolysis method for ultrasensitive detection of DA was reported by Gupta and Nandi [37].…”

Section: Resultsmentioning

confidence: 99%

Preparation of Carbon Dots with High-Fluorescence Quantum Yield and Their Application in Dopamine Fluorescence Probe and Cellular Imaging

Lin

Huang

Ding

2019

Journal of Nanomaterials

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Carbon dots represent a kind of fluorescent nanomaterial and have broad application prospects in the field of biosensing and optoelectronics. Here, we explored carbon dots with a high-fluorescence quantum yield rate synthesized from L-cysteine and citric acid by the microwave-assisted method. The characteristics of the carbon dots were studied using a transmission electron microscope, an X-ray diffractometer, X-ray photoelectron spectra, a UV-Vis absorption spectrometer, a FTIR spectrometer, and a fluorescence spectrophotometer. The obtained carbon dots exhibited a high-fluorescence quantum yield (up to 85%), which is due to the combination of amidogens and sulfydryl with carbon dots, and hence bring the improved fluorescence property. We used carbon dots for in vitro imaging of CRL-5822 cells and human umbilical vein endothelial cells, which showed the low inhibitory rate (0.8%) of cells for 48 h with good biocompatibility demonstrated by the cell viability assay. The image of cells can be observed clearly under UV light. The Stern-Volmer equation was introduced to describe the quenching effect between the fluorescence intensity of carbon dots and the concentration of aqueous dopamine (DA).

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“…In recent years, the electrochemical method has been widely employed in synthesizing QDs and nanoparticles-decorated graphene. For example, GQDs, 74 N-doped GQDs, 75 and Ndoped carbon QDs 76 have been successfully prepared by the electrochemical method for cellular imaging. They bring numerous advantages of high quantum yield, low biotoxicity and large scale synthesis.…”

Section: Electrochemical Methodsmentioning

confidence: 99%