Enhancing the luminescence of carbon dots with a reduction pathway

Zheng, Huzhi; Wang, Qinlong; Long, Yijuan; Zhang, Haijie; Huang, Xiaoxiao; Zhu, Rui

doi:10.1039/c1cc14741b

Cited by 390 publications

(310 citation statements)

References 26 publications

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“…No obvious change of emission wavelength was found after reduction with sodium borohydride. In the previous study carried out by Zheng and coworkers [18], the relative QY of the reduced state carbon dots was also greatly enhanced by reducing carbon dots with NaBH 4 . The proposed mechanism for the enhanced luminescence of reduced C-cots could be ascribed to the formation of surface hydroxyl groups [18].…”

Section: Resultsmentioning

confidence: 85%

“…In the previous study carried out by Zheng and coworkers [18], the relative QY of the reduced state carbon dots was also greatly enhanced by reducing carbon dots with NaBH 4 . The proposed mechanism for the enhanced luminescence of reduced C-cots could be ascribed to the formation of surface hydroxyl groups [18]. The role of hydroxyl groups was verified by treating the C-dots with hydroxyl group-selective oxidant like KMnO 4 and the luminescence of the C-dots was greatly quenched, demonstrating that the luminescence enhancement of the C-dots is due to the formation of surface hydroxyl groups.…”

Section: Resultsmentioning

confidence: 85%

“…Doping C-dots with inorganic salt ZnS or SiO 2 is able to enhance the QY of C-dots [10]. Enhancing the luminescence of C-dots with a reduction pathway is also reported recently [18]. Surface passivation with polyethylene glycol (PEG) has been thought as an effective way to improve the fluorescent properties of the C-dots [7].…”

Section: Introductionmentioning

confidence: 94%

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Enhanced photoluminescence and characterization of multicolor carbon dots using plant soot as a carbon source

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Tang

et al. 2013

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Section: Resultsmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 85%

See 1 more Smart Citation

Enhanced photoluminescence and characterization of multicolor carbon dots using plant soot as a carbon source

Tan

Zhang

Tang

et al. 2013

Talanta

110

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“…Common surface treatments include refl ux with HNO 3 /H 2 SO 4 to generate polar groups, 50 reduction via sodium borohydrate, 51 functionalization with PEG-based amines 19 or small molecules, 52 and coating with ZnO and ZnS. 53 Apart from those post-synthesis surface treatments, controlled carbonization approaches allow the formation of surface functionalities in situ with the synthesis of C-dots.…”

Section: In Situ Formation Of Functional Groupsmentioning

confidence: 99%

From highly graphitic to amorphous carbon dots: A critical review

Kelarakis

2014

MRS Energy & Sustainability

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Graphitic and amorphous C-dots share common characteristics in their photoluminescence behavior. However, the graphitic dots have a lead as electrocatalyst for fuel cells, sensitizers, and electron acceptors for solar cells.The emergence of carbogenic nanoparticles (C-dots) as a new class of photoluminescent (PL) nanoemitters is directly related to their economical preparation, nontoxic nature, versatility, and tunability. C-dots are typically prepared by pyrolytic or oxidative treatment of suitable precursors.While the surface functionalities critically affect the dispersibility and the emission intensity of C-dots in a given environment, it is the nature of the carbogenic core that actually imparts certain intrinsic properties. Depending on the synthetic approach and the starting materials, the structure of the carbogenic core can vary from highly graphitic all the way to completely amorphous. This critical review focuses on correlating the functions of C-dots with the graphitic or amorphous nature of their carbogenic cores. The systematic classifi cation on that basis can provide insights on the origins of their intriguing photophysical behavior and can contribute in realizing their full potential in challenging applications.Keywords : luminescence ; nanostructure ; carbonization REVIEW DISCUSSION POINT ▪ C-dots set an example that low-cost, non-toxic materials can effectively supplant highly engineered, yet toxic compounds in challenging applications.

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“…Fluorescence quantum yields (QY) were determined using the slope method described in ref. [32][33][34] using quinine sulfate as standard (Sigma-Aldrich, America, QY: 54.6%). The value of the quantum yield of sample QY x is calculated using eqn (1):…”

Section: Characterization and Devicesmentioning

confidence: 99%

Photobleaching and stabilization of carbon nanodots produced by solvothermal synthesis

Wang

Damm

Walter

et al. 2016

Phys. Chem. Chem. Phys.

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In this work we performed a detailed investigation of the photostability of bottom-up produced carbon nanodots (CDs) prepared from citric acid and urea by solvothermal synthesis. Analytical ultracentrifugation (AUC) reveals that the CDs have a hydrodynamic diameter of o1 nm and a very narrow size distribution.In the community it is widely assumed that CDs are photo-stable. In contrast, we found that CDs exposed to UV-irradiation exhibit noteworthy fluorescence degeneration compared to freshly prepared CDs or CDs stored in the dark, indicating that fluorescence bleaching is caused by a photochemical process. We found that fluorescence intensity decay due to exposure to UV-irradiation is accelerated in the presence of oxygen and identified the surface status of CDs as the decisive factor of fluorescence bleaching of CDs.Based on a discussion on the underlying mechanisms we show how to avoid photobleaching of CDs.

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Enhancing the luminescence of carbon dots with a reduction pathway

Cited by 390 publications

References 26 publications

Enhanced photoluminescence and characterization of multicolor carbon dots using plant soot as a carbon source

Enhanced photoluminescence and characterization of multicolor carbon dots using plant soot as a carbon source

From highly graphitic to amorphous carbon dots: A critical review

Photobleaching and stabilization of carbon nanodots produced by solvothermal synthesis

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