Fluorescent carbon ‘quantum’ dots from thermochemical functionalization of carbon nanoparticles

Rednic, Monica; Lu, Zhuomin; Wang, Ping; LeCroy, Gregory E.; Yang, Fan; Liu, Yun; Qian, Haijun; Terec, Anamaria; Veca, L. Monica; Lu, Feiyu; Sun, Ya‐Ping

doi:10.1016/j.cplett.2015.08.069

Cited by 9 publications

(4 citation statements)

References 31 publications

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“…In more recent studies, the pre-processed and selected small carbon nanoparticles were also surface-functionalized by organic species in thermal reactions, with the functionalization achieved through the melting of a portion of each organic species onto the carbon nanoparticle surface for the desired passivation effect 40, 46. Such a synthesis based on pre-existing carbon nanoparticles also produces CDots that are structurally more closely aligned with the general definition (Figure 1).…”

Section: Carbon Dots (Cdots)mentioning

confidence: 97%

Carbon Dots as Potent Antimicrobial Agents

et al. 2020

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Carbon dots (CDots) have emerged to represent a highly promising new platform for visible/natural light-activated microbicidal agents. In this article, the syntheses, structures, and properties of CDots are highlighted, representative studies on their activities against bacteria, fungi, and viruses reviewed, and the related mechanistic insights discussed. Also highlighted and discussed are the excellent opportunities for potentially extremely broad applications of this new platform, including theranostics uses.

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Section: Carbon Dots (Cdots)mentioning

confidence: 97%

Carbon Dots as Potent Antimicrobial Agents

et al. 2020

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“…Carbon quantum dots (CQDs) have attracted considerable attention for their unique and tunable photoluminescence properties [1,2,3], easy of functionalization [4,5], high photostability [6], excellent biocompatibility [7,8,9] and negligible environmental impact [10]. Benefiting from these features and others, CQDs have been widely applied in electrochemical immune-sensing [11], bio-imaging [12,13,14], fluorescent probes [15], photocatalysis [16] and optoelectronics [17].…”

Section: Introductionmentioning

confidence: 99%

Green Preparation of Fluorescent Carbon Quantum Dots from Cyanobacteria for Biological Imaging

et al. 2019

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Biomass-based carbon quantum dots (CQDs) have become a significant carbon materials by their virtues of being cost-effective, easy to fabricate and low in environmental impact. However, there are few reports regarding using cyanobacteria as a carbon source for the synthesis of fluorescent CQDs. In this study, the low-cost biomass of cyanobacteria was used as the sole carbon source to synthesize water-soluble CQDs by a simple hydrothermal method. The synthesized CQDs were mono-dispersed with an average diameter of 2.48 nm and exhibited excitation-dependent emission performance with a quantum yield of 9.24%. Furthermore, the cyanobacteria-derived CQDs had almost no photobleaching under long-time UV irradiation, and exhibited high photostability in the solutions with a wide range of pH and salinity. Since no chemical reagent was involved in the synthesis of CQDs, the as-prepared CQDs were confirmed to have low cytotoxicity for PC12 cells even at a high concentration. Additionally, the CQDs could be efficiently taken up by cells to illuminate the whole cell and create a clear distinction between cytoplasm and nucleus. The combined advantages of green synthesis, cost-effectiveness and low cytotoxicity make synthesized CQDs a significant carbon source and broaden the application of cyanobacteria and provide an economical route to fabricate CQDs on a large scale.

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“…2–4,6,8 Thus, an interesting and useful strategy is to combine the advantageous characteristics of the two synthetic approaches for more controllable yet efficient and versatile preparations of carbon dots. Specifically for such a hybrid approach, 32 the pre-processed and selected small carbon nanoparticles are used as precursor, but instead of chemical functionalization reactions, the molecules or species designed for surface passivation are “attached to” (or more like “welded onto”) the carbon nanoparticles in thermally induced reactions, in which the molecules for passivation may also be slightly or partially carbonized in the reactions (Figure 1). Nevertheless, the hybrid approach still adheres closely to the definition of carbon dots as surface-passivated small carbon nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Photoexcited state properties of carbon dots from thermally induced functionalization of carbon nanoparticles

Awak

Yang

et al. 2016

J. Mater. Chem. C

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Carbon dots are small carbon nanoparticles with various surface passivation schemes, in which more effective has been the deliberate chemical functionalization of the nanoparticles for brighter fluorescence emissions, though the synthesis method is more tedious and subject to some limitations in the selection of functionalization molecules. Another more popular synthesis method has been the carbonization of organic species, with the method being more efficient and versatile, but less controllable in the synthesis and for the desired dot structure and performance. In this work, a hybrid approach combining the advantageous characteristics of the two synthesis methods was applied to the preparation of carbon dots with polyethyleneimine (PEI) for surface passivation, where pre-processed and selected small carbon nanoparticles were functionalized with PEI in microwave-induced thermal reactions. The optical absorption and fluorescence emission properties were evaluated, and the results suggested that the carbon dots thus prepared shared the same photoexcited state characteristics with those from the deliberate chemical functionalization, including comparable fluorescence colors and other properties. A further demonstration on the similarity in photoexcited state properties was based on the same visible light-activated bactericidal functions of the PEI-carbon dots as those found in carbon dots from the deliberate chemical functionalization. The advantages and potential limitations of the hybrid approach for more controllable yet versatile and efficient syntheses of carbon dots are highlighted and discussed.

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Fluorescent carbon ‘quantum’ dots from thermochemical functionalization of carbon nanoparticles

Cited by 9 publications

References 31 publications

Carbon Dots as Potent Antimicrobial Agents

Carbon Dots as Potent Antimicrobial Agents

Green Preparation of Fluorescent Carbon Quantum Dots from Cyanobacteria for Biological Imaging

Photoexcited state properties of carbon dots from thermally induced functionalization of carbon nanoparticles

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