One-step hydrothermal synthesis of nitrogen-doped carbon dots for high-sensitivity visual detection of nitrite and ascorbic acid

2021 ◽  
Author(s):  
yafeng Deng ◽  
Yihua Zhou ◽  
Qingzhi Li ◽  
Jun Qian
Keyword(s):  
Ascorbic Acid ◽  
Visual Detection ◽  
High Sensitivity ◽  
Human Metabolism ◽  
Nitrogen Doped ◽  
One Step ◽  
Excessive Intake ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon

Ascorbic acid (AA) plays the role of one indispensable vitamin for the human body and is associated with the critical processes of human metabolism. However, excessive intake of AA can...

scholarly journals Detection of Melamine Based on the Fluorescence Changes of Nitrogen-Doped Carbon Dots

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Wenzhi Yin ◽  
Chaoqun Ma ◽  
Tuo Zhu ◽  
Jiao Gu ◽  
Chun Zhu ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Detection Method ◽  
Limit Of Detection ◽  
High Sensitivity ◽  
Mercury Ions ◽  
Measuring Range ◽  
Nitrogen Doped ◽  
One Step ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon

In order to determine the concentration of melamine, nitrogen-doped carbon dots (NCDs) were synthesized in one step as a fluorescent probe. Uric acid and diethylenetriamine were used as carbon source and nitrogen source, respectively. The experimental results showed that the fluorescence of NCDs can be quenched by mercury ions (Hg2+). Due to the strong coordination affinity between the carbon-nitrogen heterocyclic of melamine and Hg2+, part of Hg2+ coordinated with melamine when melamine was mixed with Hg2+. Then, the fluorescence of the added NCDs was quenched by the remaining Hg2+. Therefore, the concentration of melamine could be determined. The results show that the method has high sensitivity in wide measuring range that the linear ranges are 50–400 μg/L and 800–2500 μg/L, and the R2 is 0.997 and 0.988, respectively, with the limit of detection (LOD) of 21.76 μg/L. The NCDs are easy to fabricate, and the detection method is easy to implement. In this study, a new method for melamine detection was established, and the proposed method for melamine detection can provide some insights for food safety detection.

Nitrogen doped carbon dots: mechanism investigation and their application for label free CA125 analysis

2019 ◽  
Vol 7 (19) ◽  
pp. 3053-3058 ◽  
Author(s):  
Yuanyuan Liu ◽  
Liping Jiang ◽  
Bijun Li ◽  
Xinyue Fan ◽  
Wei Wang ◽  
...  
Keyword(s):  
Nitrogen Doping ◽  
Competitive Adsorption ◽  
High Sensitivity ◽  
Label Free ◽  
Nitrogen Doped ◽  
Microwave Assisted ◽  
Turn On ◽  
Sensitivity And Selectivity ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon

Nitrogen-doped CDs (N-CDs) were firstly prepared by using pear juice as the carbon source and ethanediamine as a nitrogen doping precursor with a microwave assisted pyrolysis technique. Based on the fluorescence recovery induced by competitive adsorption and desorption, a label-free “turn on” fluorescence assay with high sensitivity and selectivity was proposed for the analysis of CA125.

Carbonization conditions influence the emission characteristics and the stability against photobleaching of nitrogen doped carbon dots

Nanoscale ◽  
2017 ◽  
Vol 9 (32) ◽  
pp. 11730-11738 ◽  
Author(s):  
Yuan Xiong ◽  
Julian Schneider ◽  
Claas J. Reckmeier ◽  
He Huang ◽  
Peter Kasák ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Nitrogen Doping ◽  
Luminescence Properties ◽  
Emission Characteristics ◽  
Nitrogen Doped ◽  
The Stability ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon

Our study provides insights into the origin of the luminescence properties of carbon dots, by addressing the role of carbonization conditions, nitrogen doping, and formation of molecular fluorophores.

Fluorescent and visual detection of methyl-paraoxon by using boron-and nitrogen-doped carbon dots

2020 ◽  
Vol 154 ◽  
pp. 104547 ◽  
Author(s):  
Mai Luo ◽  
Jinchao Wei ◽  
Yunyang Zhao ◽  
Yuzhou Sun ◽  
Hengxing Liang ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Visual Detection ◽  
Nitrogen Doped ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon

Nitrogen-doped carbon dots as fluorescent probe for detection of curcumin based on the inner filter effect

RSC Advances ◽  
2015 ◽  
Vol 5 (115) ◽  
pp. 95054-95060 ◽  
Author(s):  
Qingyan Zhang ◽  
Caihong Zhang ◽  
Zengbo Li ◽  
Jinyin Ge ◽  
Chenzhong Li ◽  
...  
Keyword(s):  
Citric Acid ◽  
Carbon Source ◽  
Nitrogen Source ◽  
Carbon Dots ◽  
Inner Filter Effect ◽  
Nitrogen Doped ◽  
Filter Effect ◽  
One Step ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon

A facile, economical and green one-step hydrothermal method for N-doped CDs was presented by using citric acid as carbon source and urea as nitrogen source. The fluorescence of N-doped CDs quenched dramatically from curcumin via inner filter effect.

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