Highly luminescent nitrogen-doped carbon quantum dots as effective fluorescent probes for mercuric and iodide ions

2015 ◽  
Vol 3 (9) ◽  
pp. 1922-1928 ◽  
Author(s):  
Zi Li ◽  
Huijun Yu ◽  
Tong Bian ◽  
Yufei Zhao ◽  
Chao Zhou ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Fluorescence Quenching ◽  
Fluorescent Probes ◽  
Hydrothermal Reaction ◽  
Carbon Quantum Dots ◽  
Iodide Ions ◽  
Nitrogen Doped ◽  
Recovery Processes ◽  
One Step ◽  
Nitrogen Doped Carbon

Nitrogen-doped carbon quantum dots (N-CQDs) prepared via a one-step hydrothermal reaction exhibited highly selective and sensitive detection of Hg2+ and I− through fluorescence quenching and recovery processes, respectively.

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 One-step and green synthesis of nitrogen-doped carbon quantum dots for multifunctional electronics

RSC Advances ◽  
2017 ◽  
Vol 7 (35) ◽  
pp. 21969-21973 ◽  
Author(s):  
Zhan Wang ◽  
Lijun Cao ◽  
Yamei Ding ◽  
Rui Shi ◽  
Xiangjing Wang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Green Synthesis ◽  
Carbon Quantum Dots ◽  
Limiting Behavior ◽  
Nitrogen Doped ◽  
Current Limiting ◽  
One Step ◽  
Nitrogen Doped Carbon

A facile one-step and green synthesis of nitrogen-doped CQDs has been developed, the N-doped CQD-based device exhibits multifunctional memory and current limiting behavior.

Facile one-step synthesis and fluorescence performance study of nitrogen-doped carbon quantum dots

2021 ◽  
Vol 14 (02) ◽  
pp. 2150009
Author(s):  
Xu Huai ◽  
Weiwei Duan ◽  
Jiayu Li ◽  
Qin Zhang ◽  
Qian Dong ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Nitrogen Concentration ◽  
Carbon Sources ◽  
Fluorescence Emission ◽  
Carbon Quantum Dots ◽  
Performance Study ◽  
Blue Fluorescence ◽  
Nitrogen Doped ◽  
One Step ◽  
Nitrogen Doped Carbon

A facile strategy is reported to synthesize nitrogen-doped carbon quantum dots (N-CQDs) with fluorescence emission by a one-step hydrothermal treatment under different temperatures with dicyanodiamide and citric acid as precursor materials of nitrogen and carbon sources, respectively. The as-produced N-CQDs display green or blue fluorescence under the ultraviolet lamp was controlled by the reaction temperature. Consequently, the as-prepared sample reacted at 200[Formula: see text]C (N-CQDs-200), within the range of 3 nm, exhibits blue fluorescence excited at 365 nm irradiation with the maximum quantum yield (QY) of ca. 30.6%. Moreover, the N-CQDs possess rich functional groups such as nitrous groups and multiple oxygenated groups, which result in a favorable solubility in most hydrophilic solvents. From the characterization and discussion of TEM, HRTEM, FT-IR, XPS, Raman and UV-Vis, it is illustrated that the fluorescence performance was largely related to the nanomorphology, nitrogen concentration, multi-surface emission sites and various forms of transitions derived from the nitrogen doping. With the excellent fluorescence performance and the favorable solubility in solvents, the products are potentially suitable for monitoring organics.

One-step synthesis of nitrogen-doped carbon quantum dots for paper-based electrochemiluminescence detection of Cu2+ ions

2021 ◽  
pp. 107057
Author(s):  
Ruirui Li ◽  
Zikang Zhu ◽  
Peng Pan ◽  
Jun Liu ◽  
Baozeng Zhou ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Quantum Dots ◽  
Nitrogen Doped ◽  
One Step ◽  
Nitrogen Doped Carbon

A novel nitrogen-doped carbon quantum dots as effective fluorescent probes for detecting dopamine

2020 ◽  
Vol 391 ◽  
pp. 112374 ◽  
Author(s):  
Cunjin Wang ◽  
Huanxian Shi ◽  
Min Yang ◽  
Yujia Yan ◽  
Enzhou Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Fluorescent Probes ◽  
Carbon Quantum Dots ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon
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