Efficient Fluorescence Quenching in Carbon Dots by Surface-Doped Metals - Disruption of Excited State Redox Processes and Mechanistic Implications

Xu, Juan; Sahu, Sushant; Cao, Li; Bunker, Christopher E.; Ge, Peng; Liu, Yamin; Fernando, K. A. Shiral; Wang, Ping; Guliants, Elena A.; Meziani, Mohammed J.; Qian, Haijun; Sun, Ya‐Ping

doi:10.1021/la302506e

Cited by 92 publications

(76 citation statements)

References 36 publications

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“…For microscopy characterization only, the EDA carbon dots were very lightly coated with gold by visible-light irradiation of the solution with HAuCl 4 for a few minutes. 31 …”

Section: Methodsmentioning

confidence: 99%

Visible-Light-Activated Bactericidal Functions of Carbon “Quantum” Dots

Meziani

Dong

Zhu³

et al. 2016

ACS Appl. Mater. Interfaces

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227

168

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Carbon dots, generally defined as small carbon nanoparticles with various surface passivation schemes, have emerged as a new class of quantum-dot-like nanomaterials, with their optical properties and photocatalytic functions resembling those typically found in conventional nanoscale semiconductors. In this work, carbon dots were evaluated for their photoinduced bactericidal functions, with the results suggesting that the dots were highly effective in bacteria-killing with visible-light illumination. In fact, the inhibition effect could be observed even simply under ambient room lighting conditions. Mechanistic implications of the results are discussed and so are opportunities in the further development of carbon dots into a new class of effective visible/natural light-responsible bactericidal agents for a variety of bacteria control applications.

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“…For microscopy characterization only, the EDA carbon dots were very lightly coated with gold by visible-light irradiation of the solution with HAuCl 4 for a few minutes. 31 …”

Section: Methodsmentioning

confidence: 99%

Visible-Light-Activated Bactericidal Functions of Carbon “Quantum” Dots

Meziani

Dong

Zhu³

et al. 2016

ACS Appl. Mater. Interfaces

Self Cite

227

168

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“…For microscopy analyses, some of the PEI/CA-CDots were doped with a small amount of silver via simple visible-light photolysis in an aqueous solution of silver nitrate (the doping level kept very low, as monitored in terms of the very onset in the initial emergence of the silver plasmon absorption band). 41 …”

Section: Methodsmentioning

confidence: 99%

Modified facile synthesis for quantitatively fluorescent carbon dots

Hou

Ping

et al. 2017

Carbon

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A simple yet consequential modification was made to the popular carbonization processing of citric acid - polyethylenimine precursor mixtures to produce carbon dots (CDots). The modification was primarily on pushing the carbonization processing a little harder at a higher temperature, such as the hydrothermal processing condition of around 330 °C for 6 hours. The CDots thus produced are comparable in spectroscopic and other properties to those obtained in other more controlled syntheses including the deliberate chemical functionalization of preprocessed and selected small carbon nanoparticles, demonstrating the consistency in CDots and reaffirming their general definition as carbon nanoparticles with surface passivation by organic or other species. Equally significant is the finding that the modified processing of citric acid - polyethylenimine precursor mixtures could yield CDots of record-setting fluorescence performance, approaching the upper limit of being quantitatively fluorescent. Thus, the reported work serves as a demonstration on not only the need in selecting the right processing conditions and its associated opportunities in one-pot syntheses of CDots, but also the feasibility in pursuing the preparation of quantitatively fluorescent CDots, which represents an important milestone in the development and understanding of these fluorescent carbon nanomaterials.

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“…However, there is indirect experimental evidence on the excited state redox species and processes. 39,41,42 Among more compelling are the results suggesting that photoexcited carbon dots are both excellent electron donors and acceptors, with fluorescence emissions quenched efficiently by electron acceptor and donor molecules statically and dynamically in a diffusion-controlled fashion (Fig. 4).…”

Section: Carbon Dotsmentioning

confidence: 99%

Carbon Quantum Dots and Applications in Photocatalytic Energy Conversion

Fernando

Sahu

Liu

et al. 2015

ACS Appl. Mater. Interfaces

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655

343

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Quantum dots (QDs) generally refer to nanoscale particles of conventional semiconductors that are subject to the quantum-confinement effect, though other nanomaterials of similar optical and redox properties are also named as QDs even in the absence of strictly defined quantum confinement. Among such nanomaterials that have attracted tremendous recent interest are carbon dots, which are small carbon nanoparticles with some form of surface passivation, and graphene quantum dots in various configurations. In this article, we highlight these carbon-based QDs by focusing on their syntheses, on their photoexcited state properties and redox processes, and on their applications as photocatalysts in visible-light carbon dioxide reduction and in water-splitting, as well as on their mechanistic similarities and differences.

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Efficient Fluorescence Quenching in Carbon Dots by Surface-Doped Metals - Disruption of Excited State Redox Processes and Mechanistic Implications

Cited by 92 publications

References 36 publications

Visible-Light-Activated Bactericidal Functions of Carbon “Quantum” Dots

Visible-Light-Activated Bactericidal Functions of Carbon “Quantum” Dots

Modified facile synthesis for quantitatively fluorescent carbon dots

Carbon Quantum Dots and Applications in Photocatalytic Energy Conversion

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