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.

One step synthesis of N-doped carbon dots/hydroxyapatite:Eu,Gd composite with dual-emissive and solid-state photoluminescence

2020 ◽  
Vol 508 ◽  
pp. 144862 ◽  
Author(s):  
Qing Chang ◽  
Wei Xu ◽  
Qianqian Chen ◽  
Chaorui Xue ◽  
Ning Li ◽  
...  
Keyword(s):  
Solid State ◽  
Carbon Dots ◽  
One Step ◽  
Doped Carbon Dots

Fe3+ detection, bioimaging, and patterning based on bright blue-fluorescent N-doped carbon dots

The Analyst ◽  
2020 ◽  
Vol 145 (16) ◽  
pp. 5450-5457 ◽  
Author(s):  
Lin Li ◽  
Lihong Shi ◽  
Jing Jia ◽  
Dan Chang ◽  
Chuan Dong ◽  
...  
Keyword(s):  
Hydrothermal Treatment ◽  
Carbon Dots ◽  
Cellular Imaging ◽  
One Step ◽  
Doped Carbon Dots ◽  
Bright Blue

The bright blue fluorescent N-doped carbon dots (N-CDs) was successfully fabricated by one-step hydrothermal treatment of astragalus and was exploited for cellular imaging and patterning.

scholarly journals Aggregation induced red shift emission of phosphorus doped carbon dots

RSC Advances ◽  
2017 ◽  
Vol 7 (51) ◽  
pp. 32225-32228 ◽  
Author(s):  
Ying Li ◽  
Hechun Lin ◽  
Chunhua Luo ◽  
Yunqiu Wang ◽  
Chunli Jiang ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Carbon Dots ◽  
Red Shift ◽  
One Step ◽  
Doped Carbon Dots ◽  
Phosphorus Doped ◽  
Method Show

Phosphorous doped carbon dots (P-CDs), prepared by a one-step hydrothermal method, show the phenomenon of aggregation induced red shift emission (AIRSE).

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.

scholarly journals B- and N-doped carbon dots by one-step microwave hydrothermal synthesis: tracking yeast status and imaging mechanism

2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Bo Tian ◽  
Tianxin Fu ◽  
Yang Wan ◽  
Yun Ma ◽  
Yanbo Wang ◽  
...  
Keyword(s):  
Yeast Cell ◽  
Carbon Dots ◽  
Biomedical Application ◽  
Basic Research ◽  
Growth Status ◽  
Dose Time ◽  
Microwave Hydrothermal ◽  
One Step ◽  
Doped Carbon Dots ◽  
Energy Dependent

Abstract Background Carbon dots (CDs) are widely used in cell imaging due to their excellent optical properties, biocompatibility and low toxicity. At present, most of the research on CDs focuses on biomedical application, while there are few studies on the application of microbial imaging. Results In this study, B- and N-doped carbon dots (BN-CDs) were prepared from citric acid, ethylenediamine, and boric acid by microwave hydrothermal method. Based on BN-CDs labeling yeast, the dead or living of yeast cell could be quickly identified, and their growth status could also be clearly observed. In order to further observe the morphology of yeast cell under different lethal methods, six methods were used to kill the cells and then used BN-CDs to label the cells for imaging. More remarkably, imaging of yeast cell with ultrasound and antibiotics was significantly different from other imaging due to the overflow of cell contents. In addition, the endocytosis mechanism of BN-CDs was investigated. The cellular uptake of BN-CDs is dose, time and partially energy-dependent along with the involvement of passive diffusion. The main mechanism of endocytosis is caveolae-mediated. Conclusion BN-CDs can be used for long-term stable imaging of yeast, and the study provides basic research for applying CDs to microbiol imaging. Graphical Abstract

Green Preparation of Carbon Dots from Lycium Ruthenicum for Anti-counterfeiting

2021 ◽  
Author(s):  
Ting Guo ◽  
Xinyi Jiang ◽  
Xiaolin Hu ◽  
Xinyu Sun ◽  
Liangzhe Chen ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Uv Light ◽  
High Yield ◽  
Surface Functional Groups ◽  
Reaction Conditions ◽  
Complex Processes ◽  
Ink Jet ◽  
Lycium Ruthenicum ◽  
Alternative Material ◽  
One Step

Carbon dots (CDs) with excellent fluorescent performance are a potential material to restrain fakes, but the complex processes, high cost, and toxicity impede their application. Here, Lycium ruthenicum is employed as the carbon source, and eco-friendly CDs are obtained via a one-step hydrothermal method. The reaction conditions such as dosage, temperature, and time are optimized to achieve high yield, and the morphology, surface functional groups, and optical properties are characterized by scientific instruments. The results show that the spherical CDs with a diameter of 1.83 ± 0.30 nm have excellent solubility and a strong absorption peak at 285 nm. Subsequently, CDs were made into fluorescent inks; an ink-jet printer and a fountain pen are selected to examine the anti-counterfeit effect. Notably, the encrypted patterns can be hidden and perceived easily under natural light and UV light. Hence, these prepared CDs are expected to be an alternative material to be applied in the security field.

scholarly journals One-Step Hydrothermal Synthesis of N, Fe-Codoped Carbon Dots as Mimic Peroxidase and Application on Hydrogen Peroxide and Glucose Detection

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Yan Li ◽  
Yuhui Weng ◽  
Shikong Lu ◽  
Meihua Xue ◽  
Bixia Yao ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Photoelectron Spectroscopy ◽  
Carbon Dots ◽  
Color Change ◽  
Limit Of Detection ◽  
Colorimetric Detection ◽  
Catalytic Efficiency ◽  
Transmission Electron ◽  
One Step ◽  
First Time

In this paper, N, Fe-codoped carbon dots (N, Fe-CDs) were synthesized from β-cyclodextrin, ethylenediamine, and ferric chloride for the first time using a convenient one-step hydrothermal method. The obtained N, Fe-CDs were characterized by various methods including transmission electron microscopy, X-ray photoelectron spectroscopy, and Fourier-transform infrared spectroscopy. The N, Fe-CDs exhibited better catalytic activity than horseradish peroxidase (HRP) and caused an evident color change for 3,3′,5,5′-tetramethylbenzidine in the presence of H2O2. Kinetic experiments show that the apparent Km value for the N, Fe-CDs with TMB (0.40 mM) or H2O2 (0.35 mM) as the substrate was lower than that of HRP (0.43 and 3.70 mM), suggesting that the N, Fe-CDs have a much higher affinity for TMB and H2O2 than HRP. The Km/Vmax value for the N, Fe-CDs (21.74×103·s for H2O2) is significantly lower than that for HRP (42.53×103·s), suggesting that the N, Fe-CDs have a stronger catalytic efficiency for H2O2 than HRP. Furthermore, a highly efficient and sensitive colorimetric detection method for glucose was developed using the N, Fe-CDs as mimic peroxidase to detect the hydrogen peroxide generated by the oxidation of glucose by glucose oxidase. The limit of detection for H2O2 and glucose was found to be 0.52 and 3.0 μM, respectively. The obtained N, Fe-codoped carbon dots, which possess simulated peroxidase activity, can potentially be used in the field of biotechnology.

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