Nitrogen/sulfur-co-doped carbon quantum dots: a biocompatible material for the selective detection of picric acid in aqueous solution and living cells

2020 ◽  
Vol 412 (15) ◽  
pp. 3753-3763 ◽  
Author(s):  
Subhash Chandra ◽  
Daraksha Bano ◽  
Priyadarshika Pradhan ◽  
Vikas Kumar Singh ◽  
Pradeep Kumar Yadav ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Picric Acid ◽  
Carbon Quantum Dots ◽  
Living Cells ◽  
Selective Detection ◽  
Biocompatible Material ◽  
Co Doped

Multifunctional N,S co-doped carbon quantum dots with pH- and thermo-dependent switchable fluorescent properties and highly selective detection of glutathione

Carbon ◽  
2016 ◽  
Vol 104 ◽  
pp. 169-178 ◽  
Author(s):  
Zhongqian Song ◽  
Fengyu Quan ◽  
Yuanhong Xu ◽  
Mengli Liu ◽  
Liang Cui ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Quantum Dots ◽  
Selective Detection ◽  
Fluorescent Properties ◽  
Co Doped

A green one-pot synthesis of nitrogen and sulfur co-doped carbon quantum dots for sensitive and selective detection of cephalexin

2017 ◽  
Vol 95 (6) ◽  
pp. 641-648 ◽  
Author(s):  
Farhad Akhgari ◽  
Naser Samadi ◽  
Khalil Farhadi ◽  
Mehrdad Akhgari
Keyword(s):  
Quantum Dots ◽  
Carbon Dots ◽  
Limit Of Detection ◽  
Carbon Quantum Dots ◽  
Water Soluble ◽  
Soluble Nitrogen ◽  
Selective Detection ◽  
Photoluminescence Intensity ◽  
Doped Carbon Dots ◽  
Co Doped

The article reports a simple, economic, and green method for preparing water-soluble, nitrogen and sulfur co-doped carbon quantum dots via a one-step hydrothermal method. Pomegranate juice served as the carbon source, and the L-cysteine provided nitrogen and sulfur. Co-doped carbon dots were characterized by X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and Fourier transform infrared (FTIR) spectroscopy techniques. The co-doped carbon dots served as fluorescent probes for sensitive and selective detection of cephalexin. Briefly, the co-doped carbon dot systems showed quenching of photoluminescence intensity in the presence of cephalexin. The decrease of fluorescence intensity made it possible to analyze cephalexin with satisfactory detection limits and linear ranges. The Sterne–Volmer plot showed a linear relationship (R2 = 0.998) between F0/F and the concentration of cephalexin over the range from 0.3 to 10 μmol L−1. The limit of detection (LOD) was estimated to be 1 × 10−7 mol L−1 (at a signal to noise ratio of 3). To validate the applicability, the described method was successfully applied for the detection of cephalexin in human urine and raw milk samples.

scholarly journals Synthesis of Lanthanide-Functionalized Carbon Quantum Dots for Chemical Sensing and Photocatalytic Application

Catalysts ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 833
Author(s):  
Fu-Ran Zou ◽  
Sai-Nan Wang ◽  
Fang-Fang Wang ◽  
Dan Liu ◽  
Ying Li
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Green Light ◽  
Carbon Quantum Dots ◽  
Selective Detection ◽  
Photoluminescence Properties ◽  
Characteristic Emission ◽  
Photocatalytic Application ◽  
Functionalized Materials ◽  
Meaningful Data

Tunable photoluminescent-functionalized carbon quantum dots CQDs@Ln (TFA)3 (Ln = Eu, Tb; TFA: trifluoroacetylacetone) were designed and synthesized by introducing lanthanide complexes into the modified CQDs surface through the carboxyl group. The as-prepared CQDs@Ln (TFA)3 emit strong blue–green light with the peak at 435 nm and simultaneously show the characteristic emission of Ln3+ under irradiation of 365 nm light in aqueous solution. Moreover, these functionalized CQDs exhibit excellent photoluminescence properties. In addition, a white luminescent solution CQDs@Eu/Tb (TFA)3 was obtained by adjusting the ratio of Eu3+/Tb3+ and the excitation wavelengths. Moreover, CQDs@Tb (TFA)3 can be utilized as a fluorescent probe for the sensitive and selective detection of MnO4− without interference from other ions in aqueous solution. These results provide the meaningful data for the multicomponent assembly and the photoluminescent-functionalized materials based on the modified CQDs and lanthanide, which can be expected to have potential application in photocatalytic or sensors.

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