scholarly journals Amplified luminescence quenching effect upon binding of nitrogen doped carbon nanodots to transition metal ions

2020 ◽  
Vol 19 (2) ◽  
pp. 207-216 ◽  
Author(s):  
J. S. Anjali Devi ◽  
R. S. Aparna ◽  
R. R. Anjana ◽  
N. S. Vijila ◽  
J. Jayakrishna ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Transition Metal ◽  
Fluorescence Quenching ◽  
Transition Metal Ions ◽  
Carbon Nanodots ◽  
Aggregate Model ◽  
Quenching Effect ◽  
Nitrogen Doped ◽  
Amplified Luminescence ◽  
Nitrogen Doped Carbon

The ‘J- or H-emissive aggregate model’ proposed for carbon nanodots is validated by monitoring their fluorescence quenching in different solutions with varying hydrogen bonding strengths.

scholarly journals A Novel Surfactant Sensitized Fluorescent Sensor for Co(II) Based on Nitrogen Doped Carbon Quantum Dots

2021 ◽  
Author(s):  
Ouwen Xu ◽  
Wei Liu ◽  
Jiawei Li ◽  
Shuyu Wan ◽  
Xiashi Zhu
Keyword(s):  
Quantum Dots ◽  
Fluorescence Quenching ◽  
Limit Of Detection ◽  
Fluorescent Sensor ◽  
Sodium Dodecyl ◽  
Carbon Quantum Dots ◽  
Quenching Effect ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon

AbstractA novel nitrogen-doped carbon quantum dots (N-CDs) were prepared by the microwave irradiation method. The fluorescence quenching effect of Co(II) on the N-CDs was studied in the sodium dodecyl sulfate (SDS) medium and the fluorescence quenching was sensitized in the SDS. The linear range of calibration curve for the determination of Co(II) was 0.17µg/mL-11.8µg/mL and the limit of detection was 0.052µg/mL. The method has been applied for the determination of Co(II) in samples with satisfactory results.

Exchange Coupling of Transition-Metal Ions through Hydrogen Bonding:  A Theoretical Investigation

2002 ◽  
Vol 124 (18) ◽  
pp. 5197-5205 ◽  
Author(s):  
Cédric Desplanches ◽  
Eliseo Ruiz ◽  
Antonio Rodríguez-Fortea ◽  
Santiago Alvarez
Keyword(s):  
Hydrogen Bonding ◽  
Transition Metal ◽  
Metal Ions ◽  
Theoretical Investigation ◽  
Exchange Coupling ◽  
Transition Metal Ions

Trapping and sensing of hazardous insecticides by chemically modified single walled carbon nanotubes

2017 ◽  
Vol 19 (35) ◽  
pp. 24059-24066 ◽  
Author(s):  
Arkamita Bandyopadhyay ◽  
Dibyajyoti Ghosh ◽  
Swapan K. Pati
Keyword(s):  
Carbon Nanotubes ◽  
Transition Metal ◽  
Computational Study ◽  
Single Walled Carbon Nanotubes ◽  
Ambient Condition ◽  
Nitrogen Doped ◽  
Chemically Modified ◽  
Nitrogen Doped Carbon ◽  
Walled Carbon Nanotubes ◽  
Incorporated Nitrogen

Computational study demonstrates transition metal incorporated nitrogen doped carbon nanotubes can efficiently trap various harmful insecticides at ambient condition.

scholarly journals Synthesis and Properties of Nitrogen-Doped Carbon Quantum Dots Using Lactic Acid as Carbon Source

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 466
Author(s):  
Kaixin Chang ◽  
Qianjin Zhu ◽  
Liyan Qi ◽  
Mingwei Guo ◽  
Woming Gao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Lactic Acid ◽  
Fluorescence Quenching ◽  
Functional Groups ◽  
Fluorescence Intensity ◽  
Carbon Quantum Dots ◽  
Nitrogen Doped ◽  
Ph Values ◽  
Wide Range ◽  
Nitrogen Doped Carbon

Nitrogen-doped carbon quantum dots (N-CQDs) were synthesized in a one-step hydrothermal technique utilizing L-lactic acid as that of the source of carbon and ethylenediamine as that of the source of nitrogen, and were characterized using dynamic light scattering, X-ray photoelectron spectroscopy ultraviolet-visible spectrum, Fourier-transformed infrared spectrum, high-resolution transmission electron microscopy, and fluorescence spectrum. The generated N-CQDs have a spherical structure and overall diameters ranging from 1–4 nm, and their surface comprises specific functional groups such as amino, carboxyl, and hydroxyl, resulting in greater water solubility and fluorescence. The quantum yield of N-CQDs (being 46%) is significantly higher than that of the CQDs synthesized from other biomass in literatures. Its fluorescence intensity is dependent on the excitation wavelength, and N-CQDs release blue light at 365 nm under ultraviolet light. The pH values may impact the protonation of N-CQDs surface functional groups and lead to significant fluorescence quenching of N-CQDs. Therefore, the fluorescence intensity of N-CQDs is the highest at pH 7.0, but it decreases with pH as pH values being either more than or less than pH 7.0. The N-CQDs exhibit high sensitivity to Fe3+ ions, for Fe3+ ions would decrease the fluorescence intensity of N-CQDs by 99.6%, and the influence of Fe3+ ions on N-CQDs fluorescence quenching is slightly affected by other metal ions. Moreover, the fluorescence quenching efficiency of Fe3+ ions displays an obvious linear relationship to Fe3+ concentrations in a wide range of concentrations (up to 200 µM) and with a detection limit of 1.89 µM. Therefore, the generated N-CQDs may be utilized as a robust fluorescence sensor for detecting pH and Fe3+ ions.

scholarly journals Mixed Ligand Complexes of Transition Metal Ions with Selective Bio-Ligands in Surfactant-Water Mixtures

2019 ◽  
Vol 8 (2S11) ◽  
pp. 3182-3190
Keyword(s):  
Hydrogen Bonding ◽  
Transition Metal ◽  
Metal Ions ◽  
Chemical Speciation ◽  
Transition Metal Ions ◽  
Ternary Complexes ◽  
Mixed Ligand ◽  
Stacking Interactions ◽  
Micellar Media ◽  
Chelate Effect

Chemical speciation of ternary complexes of L-arginine and L-aspartic acid with essential transition metal ions was studied pH metrically. The following MLX, MLXH and ML2X ternary species are detected and reported in this paper. The existence of different ternary species is established from modeling studies using the computer program MINIQUAD75. The relative concentrations (M: L: X=1:2:2, 1:2:4, 1:4:2) and stabilities of the ternary species are compared with those of binary species. The extra stability associated with the ternary complexes is attributed to factors such as charge neutralization, chelate effect, stacking interactions and hydrogen bonding. Trend in variation of stability constants with the change in the mole fraction of the surfactant in various micellar media is explained on the basis of electrostatic and non-electrostatic forces. Distribution diagrams in relation to pH and plausible structures were presented.

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