Electrochemiluminescence of Water-Soluble Carbon Nanocrystals Released Electrochemically from Graphite

Zheng, Liyan; Chi, Yuwu; Dong, Yongqing; Lin, Jiaming; Wang, Binbin

doi:10.1021/ja809073f

Cited by 824 publications

(640 citation statements)

References 27 publications

(60 reference statements)

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“…3(b) ]. Suitable electrolytes include ultrapure water, 27 phosphate buffer solutions, 24 NaOH/ethanol, 26 , 27 ionic liquid-water mixtures, 28 and acetonitrile. 23 Upon application of a scanning potential, extensive electrode exfoliation facilitates the release of gC-dots.…”

Section: Highly Graphitic C-dotsmentioning

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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Section: Highly Graphitic C-dotsmentioning

confidence: 99%

From highly graphitic to amorphous carbon dots: A critical review

Kelarakis

2014

MRS Energy & Sustainability

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“…The first category involves breaking larger graphitic materials into small CDs, and methods include use of arc-discharged soot [9], laser ablation of carbon targets [10], electrochemical shocking of carbon nanotubes or electrochemical exfoliation of graphite [11,12], and chemical oxidation [13]. In second approach CDs are obtained from molecular precursors particles and scorched solids.…”

Section: Introductionmentioning

confidence: 99%

Green synthesis of fluorescent carbon dots from carrot juice for in vitro cellular imaging

Liu¹,

Liu²,

Park³

et al. 2017

Carbon letters

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We report the use of carrot, a new and inexpensive biomaterial source, for preparing high quality carbon dots (CDs) instead of semi-conductive quantum dots for bioimaging application. The as-derived CDs possessing down and up-conversion photoluminescence features were obtained from carrot juice by commonly used hydrothermal treatment. The corresponding physiochemical and optical properties were investigated by electron microscopy, fluorescent spectrometry, and other spectroscopic methods. The surfaces of obtained CDs were highly covered with hydroxyl groups and nitrogen groups without further modification. The quantum yield of as-obtained CDs was as high as 5.16%. The cell viability of HaCaT cells against a purified CD aqueous solution was higher than 85% even at higher concentration (700 μg mL −1 ) after 24 h incubation. Finally, CD cultured cells exhibited distinguished blue, green, and red colors, respectively, during in vitro imaging when excited by three wavelength lasers under a confocal microscope. Offering excellent optical properties, biocompatibility, low cytotoxicity, and good cellular imaging capability, the carrot juice derived CDs are a promising candidate for biomedical applications.

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“…Alternatively, electrooxidation of CNTs [18] and graphite [19] leads to the formation of hydroxyl and oxygen radicals (produced by the electrolysis of the solvent) that attack the honeycomb lattice on defect and edge sites, facilitating the release of GQDs.…”

Section: The Graphitic Structurementioning

confidence: 99%

Graphene quantum dots: In the crossroad of graphene, quantum dots and carbogenic nanoparticles

Kelarakis

2015

Current Opinion in Colloid & Interface Science

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The scientific and technological importance of graphene quantum dots (GQDs) is directly related to their nanoscopic nature that endows remarkable photo-physical properties and colloidal stability in a variety of solvents. GQDs combine characteristics arising from their graphitic structure, their carbogenic origin and their quantum nature. They are considered as the environmentally benign alternatives of heavy metal based quantum dots, given that not only are they synthesized following green strategies, but they also exhibit minimal toxicity. GQDs are systematically explored in printing, energy harvesting, bioimaging, catalysis, optoelectronics and sensing applications.

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Electrochemiluminescence of Water-Soluble Carbon Nanocrystals Released Electrochemically from Graphite

Cited by 824 publications

References 27 publications

From highly graphitic to amorphous carbon dots: A critical review

From highly graphitic to amorphous carbon dots: A critical review

Green synthesis of fluorescent carbon dots from carrot juice for in vitro cellular imaging

Graphene quantum dots: In the crossroad of graphene, quantum dots and carbogenic nanoparticles

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