Synthesis of green-emitting carbon quantum dots with excitation wavelength dependent photoluminescence obtained from aqueous beetroot extract

MRS Advances ◽  
2016 ◽  
Vol 1 (19) ◽  
pp. 1371-1376 ◽  
Author(s):  
George R. S. Andrade ◽  
Silvânio S. L. Costa ◽  
Cristiane C. Nascimento ◽  
Iara F. Gimenez
Keyword(s):  
Quantum Dots ◽  
Carbon Source ◽  
Energy Efficient ◽  
Emission Spectra ◽  
Carbon Quantum Dots ◽  
Excitation Wavelength ◽  
Photoluminescence Properties ◽  
Microwave Assisted ◽  
Band Position ◽  
The One

ABSTRACTIn this work, 3 simple, fast, labour and energy efficient methodologies were used to prepare carbon quantum dots (C-dots) using a red beetroot (Beta vulgaris subsp. vulgaris var. vulgaris) aqueous extract as the carbon source: alkali-assisted (AA), microwave-assisted (MA) and alkali-microwave-assisted (AMA) synthesis. TEM images shows nanoparticles with a nearly spherical morphology and diameters around 7.0 nm. FTIR spectra show characteristic peaks of C-H, C-O, O-H and C=C bonds for all the samples. The emission spectra show an interesting feature of the as-prepared samples: the emission band position can be tunable by changing the excitation wavelength. Comparing the 3 different methodologies in terms of photoluminescence properties, the one based only on the microwave-assisted heating has showed the most improved emission.

scholarly journals Eco Friendly Synthesis of Carbon Dot by Hydrothermal Method for Metal Ions Salt Identification

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7604
Author(s):  
Hasan Shabbir ◽  
Tomasz Tokarski ◽  
Ditta Ungor ◽  
Marek Wojnicki
Keyword(s):  
Metal Ion ◽  
Hydrothermal Reaction ◽  
Synthesis Method ◽  
Emission Spectra ◽  
Carbon Quantum Dots ◽  
Photoluminescence Properties ◽  
Step Method ◽  
Synthesis Time ◽  
One Step ◽  
The One

In this work, we report the synthesis method of carbon quantum dots (CDs) using the one-step method for fast and effective metal ion determination. Ascorbic acid was used as an inexpensive and environmentally friendly precursor. High-pressure and high-temperature reactors were used for this purpose. Microscopic characterization revealed the size of CDs was in the range of 2–6 nm and they had an ordered structure. The photoluminescence properties of the CDs depend on the process temperature, and we obtained the highest PL spectra for 6 h of hydrothermal reaction. The maximum emission spectra depend poorly on synthesis time. Further characterization shows that CDs are a good contender for sensing Fe3+ in aqueous systems and can detect concentrations up to 0.49 ppm. The emission spectra efficiency was enhanced by up to 200% with synthesis time.

scholarly journals The effect of oxygen on the microwave-assisted synthesis of carbon quantum dots from polyethylene glycol

RSC Advances ◽  
2017 ◽  
Vol 7 (27) ◽  
pp. 16637-16643 ◽  
Author(s):  
Yunyang Zhao ◽  
Songlin Zuo ◽  
Meng Miao
Keyword(s):  
Carbon Dioxide ◽  
Quantum Dots ◽  
Polyethylene Glycol ◽  
Carbon Source ◽  
Microwave Irradiation ◽  
Carbon Quantum Dots ◽  
Microwave Assisted Synthesis ◽  
Microwave Irradiation Method ◽  
Microwave Assisted ◽  
Effect Of Oxygen

Fluorescent carbon quantum dots (CQDs) were synthesized using polyethylene glycol (PEG) as both the carbon source and solvent in various atmospheres including air, nitrogen, carbon dioxide and oxygen by following a microwave irradiation method.

scholarly journals Synthesis of Copper–nitrogen Codoped Carbon Quantum Dots Using Frangipani as a Carbon Source and Application of Metronidazole Determination

2021 ◽  
Author(s):  
Lan Yuwei Lan ◽  
Yuwei Lan ◽  
Wenbin Bao ◽  
Chunfeng Liang ◽  
Guowei Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Source ◽  
Detection Method ◽  
Fluorescence Probe ◽  
Low Cost ◽  
Copper Acetate ◽  
Carbon Quantum Dots ◽  
Excitation Wavelength ◽  
One Step ◽  
High Fluorescence

Abstract High-fluorescence Cu/N codoped carbon quantum dots (Cu/NCQDs) were prepared by a one-step hydrothermal method using frangipani as the carbon source and copper acetate as the copper source. The Cu/NCQDs exhibited high-intensity, stable blue fluorescence that is independent of the excitation wavelength. Since metronidazole can effectively quench the fluorescence intensity of Cu/NCQDs, a metronidazole fluorescence-detection method using Cu/NCQDs as the fluorescence probe was developed, and the quenching mechanism was studied.The method has the advantages of simplicity, speed, and low cost. Besides,it has a wider linear range and detection limit. Further, the metronidazole content in actual samples was determined by this method, with good results.

Properties and molecular structure of carbon quantum dots derived from empty fruit bunch biochar using a facile microwave-assisted method for the detection of Cu2+ ions

2021 ◽  
Vol 112 ◽  
pp. 110801
Author(s):  
Alif Syafiq Kamarol Zaman ◽  
Tong Ling Tan ◽  
Yamuna A/P Chowmasundaram ◽  
Norhanisah Jamaludin ◽  
Amir Reza Sadrolhosseini ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Quantum Dots ◽  
Carbon Quantum Dots ◽  
Empty Fruit Bunch ◽  
Microwave Assisted ◽  
Microwave Assisted Method

Microwave-assisted fabrication of copper-functionalized carbon quantum dots for sensitive detection of histidine

Talanta ◽  
2019 ◽  
Vol 196 ◽  
pp. 442-448 ◽  
Author(s):  
Yucan Che ◽  
Hongyu Pang ◽  
Huiyu Li ◽  
Lei Yang ◽  
Xinyao Fu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Quantum Dots ◽  
Sensitive Detection ◽  
Microwave Assisted

Nitrogen-doped carbon dot mediated fluorescence on–off assay for highly sensitive detection of I− and Br− ions

2018 ◽  
Vol 42 (17) ◽  
pp. 14332-14339 ◽  
Author(s):  
Nan Zhou ◽  
Xingwei Zhang ◽  
Yanping Shi ◽  
Zeliang Li ◽  
Zhibiao Feng
Keyword(s):  
Quantum Dots ◽  
Citric Acid ◽  
Carbon Source ◽  
Nitrogen Source ◽  
Carbon Quantum Dots ◽  
Sensitive Detection ◽  
Nitrogen Doped ◽  
Highly Sensitive ◽  
Highly Sensitive Detection ◽  
Nitrogen Doped Carbon

Nitrogen-doped carbon quantum dots (CDs) were synthesized in ethanol media by using citric acid (CA) as the carbon source and ethanediamine (EDA) as the nitrogen source.

scholarly journals Green Preparation of Fluorescent Carbon Quantum Dots from Cyanobacteria for Biological Imaging

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 616 ◽  
Author(s):  
Xi Wang ◽  
Pei Yang ◽  
Qian Feng ◽  
Taotao Meng ◽  
Jing Wei ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Source ◽  
Large Scale ◽  
Low Cost ◽  
Average Diameter ◽  
Carbon Quantum Dots ◽  
Water Soluble ◽  
High Concentration ◽  
Wide Range ◽  
Low Cytotoxicity

Biomass-based carbon quantum dots (CQDs) have become a significant carbon materials by their virtues of being cost-effective, easy to fabricate and low in environmental impact. However, there are few reports regarding using cyanobacteria as a carbon source for the synthesis of fluorescent CQDs. In this study, the low-cost biomass of cyanobacteria was used as the sole carbon source to synthesize water-soluble CQDs by a simple hydrothermal method. The synthesized CQDs were mono-dispersed with an average diameter of 2.48 nm and exhibited excitation-dependent emission performance with a quantum yield of 9.24%. Furthermore, the cyanobacteria-derived CQDs had almost no photobleaching under long-time UV irradiation, and exhibited high photostability in the solutions with a wide range of pH and salinity. Since no chemical reagent was involved in the synthesis of CQDs, the as-prepared CQDs were confirmed to have low cytotoxicity for PC12 cells even at a high concentration. Additionally, the CQDs could be efficiently taken up by cells to illuminate the whole cell and create a clear distinction between cytoplasm and nucleus. The combined advantages of green synthesis, cost-effectiveness and low cytotoxicity make synthesized CQDs a significant carbon source and broaden the application of cyanobacteria and provide an economical route to fabricate CQDs on a large scale.

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