Direct synthesis of carbon quantum dots in aqueous polymer solution: one-pot reaction and preparation of transparent UV-blocking films

Synthesized transparent CQD–PVA composite films performed stable UV-A blocking, even after exposure to UV light for several days and elevated temperature.

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The Effects of Short-Term Storage and Elevated Temperature on the Flocculation Activity of Aqueous Polymer Solution

Journal of Environmental Conservation Engineering ◽

10.5956/jriet.16.255 ◽

1987 ◽

Vol 16 (3) ◽

pp. 255-262

Author(s):

Tohru HANASAKI ◽

R. Gehr

Keyword(s):

Elevated Temperature ◽

Polymer Solution ◽

Short Term ◽

Aqueous Polymer ◽

Flocculation Activity ◽

Short Term Storage ◽

Aqueous Polymer Solution ◽

Term Storage

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SURFACTANT-FREE SYNTHESIS OF CARBON QUANTUM DOTS ADORNED COPPER OXIDE NANOCOMPOSITES AND THEIR PHOTOCATALYTIC ACTIVITY OF COMMERCIAL DYES BENEATH SUNLIGHT AND UV LIGHT SOURCES

Environmental Nanotechnology Monitoring & Management ◽

10.1016/j.enmm.2021.100427 ◽

2021 ◽

Vol 15 ◽

pp. 100427

Author(s):

Muthulingam S. ◽

Greeshma K.P. ◽

Uthirakumar A.P. ◽

Thamizselvi R.

Keyword(s):

Quantum Dots ◽

Photocatalytic Activity ◽

Copper Oxide ◽

Uv Light ◽

Carbon Quantum Dots ◽

Light Sources

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One-pot bioinspired synthesis of fluorescent metal chalcogenide and carbon quantum dots: Applications and potential biotoxicity

Colloids and Surfaces B Biointerfaces ◽

10.1016/j.colsurfb.2021.111578 ◽

2021 ◽

Vol 200 ◽

pp. 111578

Author(s):

Basma A. Omran ◽

Kathryn A. Whitehead ◽

Kwang-Hyun Baek

Keyword(s):

Quantum Dots ◽

Carbon Quantum Dots ◽

One Pot ◽

Metal Chalcogenide ◽

Bioinspired Synthesis

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Formation of Carbon Quantum Dots via Hydrothermal Carbonization: Investigate the Effect of Precursors

Energies ◽

10.3390/en14040986 ◽

2021 ◽

Vol 14 (4) ◽

pp. 986

Author(s):

Md Rifat Hasan ◽

Nepu Saha ◽

Thomas Quaid ◽

M. Toufiq Reza

Keyword(s):

Quantum Dots ◽

Optical Properties ◽

Microcrystalline Cellulose ◽

Uv Light ◽

Synthesis Method ◽

Hydrothermal Carbonization ◽

Carbon Quantum Dots ◽

Medical Diagnostics ◽

Particle Size Range ◽

Wide Range

Carbon quantum dots (CQDs) are nanomaterials with a particle size range of 2 to 10 nm. CQDs have a wide range of applications such as medical diagnostics, bio-imaging, biosensors, coatings, solar cells, and photocatalysis. Although the effect of various experimental parameters, such as the synthesis method, reaction time, etc., have been investigated, the effect of different feedstocks on CQDs has not been studied yet. In this study, CQDs were synthesized from hydroxymethylfurfural, furfural, and microcrystalline cellulose via hydrothermal carbonization at 220 °C for 30 min of residence time. The produced CQDs showed green luminescence behavior under the short-wavelength UV light. Furthermore, the optical properties of CQDs were investigated using ultraviolet-visible spectroscopy and emission spectrophotometer, while the morphology and chemical bonds of CQDs were investigated using transmission electron microscopy and Fourier-transform infrared spectroscopy, respectively. Results showed that all CQDs produced from various precursors have absorption and emission properties but these optical properties are highly dependent on the type of precursor. For instance, the mean particle sizes were 6.36 ± 0.54, 5.35 ± 0.56, and 3.94 ± 0.60 nm for the synthesized CQDs from microcrystalline cellulose, hydroxymethylfurfural, and furfural, respectively, which appeared to have similar trends in emission intensities. In addition, the synthesized CQDs experienced different functionality (e.g., C=O, O-H, C-O) resulting in different absorption behavior.

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A green synthetic route for the surface-passivation of carbon dots as an effective multifunctional fluorescent sensor for the recognition and detection of toxic metal ions from aqueous solution

Analytical Methods ◽

10.1039/c8ay02451k ◽

2019 ◽

Vol 11 (4) ◽

pp. 490-506 ◽

Cited By ~ 10

Author(s):

K. Radhakrishnan ◽

P. Panneerselvam ◽

M. Marieeswaran

Keyword(s):

Aqueous Solution ◽

Quantum Dots ◽

Carbon Dots ◽

Surface Passivation ◽

Fluorescent Sensor ◽

Toxic Metal ◽

Carbon Quantum Dots ◽

Synthetic Route ◽

One Pot ◽

Hydrothermal Methods

In this work, a green synthetic route was used to create a number of surface passivated fluorescent carbon quantum dots, which are explored as promising sensing probes, via facile one-pot hydrothermal methods.

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