scholarly journals One-step solvothermal synthesis of high-emissive amphiphilic carbon dots via rigidity derivation

2018 ◽  
Vol 9 (5) ◽  
pp. 1323-1329 ◽  
Author(s):  
Pei Zhao ◽  
Xuping Li ◽  
Glib Baryshnikov ◽  
Bin Wu ◽  
Hans Ågren ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Solvothermal Synthesis ◽  
Quantum Yields ◽  
One Step ◽  
Chemical Strategy

Here we report a chemical strategy that uses rigid molecules to straightforwardly construct amphiphilic carbon dots (ACDs) with high luminescence quantum yields (QYs).

One-step microwave synthesis of N-doped hydroxyl-functionalized carbon dots with ultra-high fluorescence quantum yields

Nanoscale ◽  
2016 ◽  
Vol 8 (33) ◽  
pp. 15281-15287 ◽  
Author(s):  
Yongqiang Zhang ◽  
Xingyuan Liu ◽  
Yi Fan ◽  
Xiaoyang Guo ◽  
Lei Zhou ◽  
...  
Keyword(s):  
Microwave Synthesis ◽  
Carbon Dots ◽  
Quantum Yields ◽  
Fluorescence Quantum Yields ◽  
One Step ◽  
High Fluorescence

scholarly journals Synthesis of Multicolor Carbon Dots Based on Solvent Control and Its Application in the Detection of Crystal Violet

Nanomaterials ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1556 ◽  
Author(s):  
Zhao ◽  
Liu ◽  
Zhang ◽  
Zhang ◽  
Liao ◽  
...  
Keyword(s):  
Crystal Violet ◽  
Carbon Dots ◽  
Raw Materials ◽  
Quantum Yields ◽  
Characterization Methods ◽  
Long Wavelength ◽  
Solvent Control ◽  
Effective Synthesis ◽  
One Step ◽  
20 Nm

The adjustment of the emitting wavelength of carbon dots (CDs) is usually realized by changing the raw materials, reaction temperature, or time. This paper reported the effective synthesis of multicolor photoluminescent CDs only by changing the solvent in a one-step solvothermal method, with 1,2,4,5-tetraaminobenzene as both the novel carbon source and nitrogen source. The emission wavelengths of the as-prepared CDs ranged from 527 to 605 nm, with quantum yields (QYs) reaching 10.0% to 47.6%, and it was successfully employed as fluorescence ink. The prepared red-emitting CDs (R-CDs, λem = 605 nm) and yellow-emitting CDs (Y-CDs, λem = 543 nm) were compared through multiple characterization methods, and their luminescence mechanism was studied. It was discovered that the large particle size, the existence of graphite Ns, and oxygen-containing functional groups are beneficial to the formation of long wavelength-emitting CDs. Y-CDs responded to crystal violet, and its fluorescence could be quenched. This phenomenon was thus employed to develop a detection method for crystal violet with a linear range from 0.1 to 11 µM and a detection limit of 20 nM.

scholarly journals Green Synthesis of Multifunctional Carbon Dots with Antibacterial Activities

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 369 ◽  
Author(s):  
Arumugam Saravanan ◽  
Moorthy Maruthapandi ◽  
Poushali Das ◽  
John H. T. Luong ◽  
Aharon Gedanken
Keyword(s):  
Carbon Dots ◽  
Fluorescence Spectra ◽  
Antibacterial Effect ◽  
Curcuma Longa ◽  
Antibacterial Activities ◽  
Blue Color ◽  
Mean Size ◽  
One Step ◽  
Bactericidal Activities ◽  
Bright Blue

Carbon dots (CDs) were obtained from medicinal turmeric leaves (Curcuma longa) by a facile one-step hydrothermal method and evaluated for their bactericidal activities against two gram-negative; Escherichia coli, Klebsiella pneumoniae, and two gram-positive counterparts; Staphylococcus aureus, S. epidermidis. The CDs exhibited spherical shapes with a mean size of 2.6 nm. The fluorescence spectra of CDs revealed intense fluorescence at λex/em = 362/429 nm with a bright blue color in an aqueous solution. The CDs showed strong photostability under various environmental conditions (pH, salt, and UV-radiation). The complete bactericidal potency of CDs was 0.25 mg/mL for E.coli and S. aureus after 8 h of exposure, while for K. pneumoniae, and S. epidermidis, the CDs at 0.5 mg/mL good antibacterial effect within 8 h and complete eradication after 24 h of exposure is observed. The release of reactive oxygen species played a crucial role in the death of the bacterial cell. The present study provides a strategy for the preparation of CDs from a medicinal plant and their potential antibacterial activities against four common contagious pathogens.

Fast one-step synthesis of N-doped carbon dots by pyrolyzing ethanolamine

2014 ◽  
Vol 2 (36) ◽  
pp. 7477-7481 ◽  
Author(s):  
Xinwei Dong ◽  
Yanjie Su ◽  
Huijuan Geng ◽  
Zhongli Li ◽  
Chao Yang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Carbon Dots ◽  
High Yield ◽  
One Step ◽  
Doped Carbon Dots

N-doped CDs can be obtained directly with high yield by pyrolyzing ethanolamine in air within just 7 minutes with the assistance of hydrogen peroxide.

Preparation of magnetically separable and recyclable carbon dots/NiCo2O4 composites with enhanced photocatalytic activity for the degradation of tetracycline under visible light

2018 ◽  
Vol 5 (6) ◽  
pp. 1438-1444 ◽  
Author(s):  
Jinhui Jiang ◽  
Weilong Shi ◽  
Feng Guo ◽  
Songliu Yuan
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Carbon Dots ◽  
Magnetic Composite ◽  
Composite Photocatalysts ◽  
One Step ◽  
Magnetically Separable ◽  
Calcination Method

CDs/NiCo2O4 magnetic composite photocatalysts with enhanced photocatalytic activity were fabricated through a one-step calcination method.

scholarly journals Tuning Carbon Dots’ Optoelectronic Properties with Polymers

Polymers ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1312 ◽  
Author(s):  
Konstantinos Dimos
Keyword(s):  
Quantum Yield ◽  
Spectral Range ◽  
Carbon Dots ◽  
Surface Passivation ◽  
Low Cost ◽  
Quality Characteristics ◽  
Optoelectronic Properties ◽  
Quantum Yields

Due to their unique properties of photoluminescence, biocompatibility, photostability, ease of preparing, and low cost, carbon dots have been studied extensively over the last decade. Soon after their discovery, it was realized that their main optical attributes may be protected, enhanced, and tuned upon proper surface passivation or functionalization. Therefore, up to date, numerous polymers have been used for these purposes, resulting to higher-quality carbon dots regarding their quantum yield or further emission-related aspects and compared to the primitive, bare ones. Hence, this review aims to clarify the polymers’ role and effect on carbon dots and their features focusing on the quality characteristics of their photoluminescence upon passivation or functionalization. Given in fact the numbers of relevant publications, emphasis is given on recent articles capturing the latest advances for polymers in carbon dots for expanding emission lifetimes, advancing quantum yields, tuning emission wavelengths, enhancing specific spectral range absorption, and tailoring optoelectronic properties in general.

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