Carbon dots (C-dots): fluorescence processes and bioimaging

Medeiros, Gisele A.; Rodrigues, Carime Vitória da Silva; Spencer, John; Neto, Brenno A. D.

doi:10.1016/b978-0-12-820566-2.00004-1

Cited by 7 publications

(3 citation statements)

References 42 publications

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“…The addition of different functional groups helps in the n−π* transition of the aromatic sp 2 carbon core to exhibit different energy states, resulting in the development of multiple surface defect states. 239,240 A border zone or spherical shell that is different from the carbon core region or body is referred to as a surface defect. The complex diversity is caused by the functional groups present on the surface or sp 2 and sp 3 hybrid carbon cores, leading to the defect state.…”

Section: Fluorescence Mechanisms Of Red-emitting Fcnmsmentioning

confidence: 99%

Comprehensive advances in the synthesis, fluorescence mechanism and multifunctional applications of red-emitting carbon nanomaterials

Mandal,

Mishra,

Singh

2023

Nanoscale Adv.

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Section: Fluorescence Mechanisms Of Red-emitting Fcnmsmentioning

confidence: 99%

Comprehensive advances in the synthesis, fluorescence mechanism and multifunctional applications of red-emitting carbon nanomaterials

Mandal,

Mishra,

Singh

2023

Nanoscale Adv.

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“…Carbon quantum dots (CQDs) stand out by exhibiting unique optical and electronic properties thanks to their quantum confinement effect [ 7 ]. With applications in imaging, solar fuels, and sensors, CQDs are environmentally friendly and have a customizable surface chemistry, contributing to their appeal in cutting-edge technologies across various domains [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Heavy Metal Detection and Removal by Composite Carbon Quantum Dots/Ionomer Membranes

Sgreccia,

Gallardo Gonzalez,

Prosposito

et al. 2024

Membranes

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The combination of ion exchange membranes with carbon quantum dots (CQDs) is a promising field that could lead to significant advances in water treatment. Composite membranes formed by sulfonated poly(ether ether ketone) (SPEEK) with embedded CQDs were used for the detection and removal of heavy metal ions, such as lead and cadmium, from water. SPEEK is responsible for the capture of heavy metals based on the cation exchange mechanism, while CQDs detect their contamination by exhibiting changes in fluorescence. Water-insoluble “red” carbon quantum dots (rCQDs) were synthesized from p-phenylenediamine so that their photoluminescence was shifted from that of the polymer matrix. CQDs and the composites were characterized by several techniques: FTIR, Raman, UV/VIS, photoluminescence, XPS spectroscopies, and AFM microscopy. The heavy metal ion concentration was analyzed by inductively coupled plasma–optical emission spectroscopy (ICP-OES). The concentration ranges were 10.8–0.1 mM for Pb2+ and 10.0–0.27 mM for Cd2+. SPEEK/rCQDs showed a more pronounced turn-off effect for lead. The composite achieved 100% removal efficiency for lead and cadmium when the concentration was below a half of the ion exchange capacity of SPEEK. The regeneration of membranes in 1 M NaCl was also studied. A second order law was effective to describe the kinetics of the process.

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“…Carbon quantum dots (CQDs) stand out by exhibiting unique optical and electronic properties thanks to their quantum confinement effect [7]. With applications in imaging, solar fuels, and sensors, 2 CQDs are environmentally friendly and have a customizable surface chemistry, contributing to their appeal in cutting-edge technologies across various domains [8].…”

Section: Introductionmentioning

confidence: 99%

Heavy Metal Detection and Removal by Composite Carbon Quantum Dots/Ionomer Membranes

Sgreccia,

Gallardo Gonzalez,

Prosposito

et al. 2024

Preprint

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Composite membranes formed by sulfonated poly(ether ether ketone) (SPEEK) with embedded carbon quantum dots (CQDs) were used for detection and removal of heavy metal ions, such as lead and cadmium, from water. SPEEK is responsible for the capture of heavy metals based on the cation exchange mechanism, while CQDs detect their contamination by exhibiting changes in fluorescence. Water-insoluble “red” carbon quantum dots (rCQDs) were synthesized from p-phenylenediamine so that their photoluminescence was shifted from that of the polymer matrix. CQDs and the composites were characterized by several techniques: FTIR, Raman, UV/VIS, photoluminescence, XPS spectroscopies and AFM microscopy. The heavy metal ion concentration was analyzed by inductively coupled plasma–optical emission spectroscopy (ICP-OES). The concentration ranges were 10.8 - 0.1 mM for Pb2+ and 10.0 - 0.27 mM for Cd2+. The composite achieved 100% removal efficiency for lead and cadmium if the concentration was below a half of the ion exchange capacity of SPEEK. The regeneration of membranes in 1 M NaCl was also studied. SPEEK/rCQDs showed a turn-off effect more pronounced for lead. A second order law was effective to describe the kinetics of the process.

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Carbon dots (C-dots): fluorescence processes and bioimaging

Cited by 7 publications

References 42 publications

Comprehensive advances in the synthesis, fluorescence mechanism and multifunctional applications of red-emitting carbon nanomaterials

Comprehensive advances in the synthesis, fluorescence mechanism and multifunctional applications of red-emitting carbon nanomaterials

Heavy Metal Detection and Removal by Composite Carbon Quantum Dots/Ionomer Membranes

Heavy Metal Detection and Removal by Composite Carbon Quantum Dots/Ionomer Membranes

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