One-step synthesized fluorescent nitrogen doped carbon dots from thymidine for Cr (VI) detection in water

Ming, Fanglin; Hou, Jingzhou; Hou, Changjun; Yang, Mei; Wang, Xianfeng; Li, Jiawei; Huo, Danqun; He, Qiang

doi:10.1016/j.saa.2019.117165

Cited by 47 publications

(17 citation statements)

References 42 publications

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“…Fluorescence and UV-Vis absorption spectroscopy were used to characterize the optical properties of NPCDs. The UV-Vis spectrum ( Figure S1) shows that a small peak appears at 234 nm that lies next to a strong peak at 334 nm, which originated owing to trapped excited-state energy from surface states [1,18,34].…”

Section: Characterization Of the Npcdsmentioning

confidence: 99%

“…Carbon dot (CD) is a new class of fluorescence carbon material that has been attracting considerable interest owing to their outstanding properties such as good water solubility, low toxicity, favorable biocompatibility, good photo-stability, tunable surface functionalities, and cell membrane permeability [1,2]. However, CDs have low quantum yields (QY) and few active sites, which limits their wider applications in fluorescent bioimaging [3][4][5], biosensing [6,7], ions and molecules detection [8,9], novel photoscience [10][11][12][13], and electrocatalysis [14].…”

Section: Introductionmentioning

confidence: 99%

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Detection of Ferric Ions and Catecholamine Neurotransmitters via Highly Fluorescent Heteroatom Co-Doped Carbon Dots

Lee

Kim

et al. 2020

Sensors

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Carbon dots (CDs) demonstrate very poor fluorescence quantum yield (QY). In this study, with the help of a hydrothermal method, we combined CDs with nitrogen and phosphorus elements belonging to the VA group (in the periodic table) to form heteroatom co-doped CDs, i.e., nitrogen and phosphorus co-doped carbon dots (NPCDs). These displayed a significant improvement in the QY (up to 84%), which was as much as four times than that of CDs synthesized by the same method. The as-prepared NPCDs could be used as an “off-on” fluorescence detector for the rapid and effective sensing of ferric ions (Fe3+) and catecholamine neurotransmitters (CNs) such as dopamine (DA), adrenaline (AD), and noradrenaline (NAD). The fluorescence of NPCDs was “turned off” and the emission wavelength was slightly red-shifted upon increasing the Fe3+ concentration. However, when CNs were incorporated, the fluorescence of NPCDs was recovered in a short response time; this indicated that CN concentration could be monitored, relying on enhancing the fluorescence signal of NPCDs. As a result, NPCDs are considered as a potential fluorescent bi-sensor for Fe3+ and CN detection. Particularly, in this research, we selected DA as the representative neurotransmitter of the CN group along with Fe3+ to study the sensing system based on NPCDs. The results exhibited good linear ranges with a limit of detection (LOD) of 0.2 and 0.1 µM for Fe3+ and DA, respectively.

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Section: Characterization Of the Npcdsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Detection of Ferric Ions and Catecholamine Neurotransmitters via Highly Fluorescent Heteroatom Co-Doped Carbon Dots

Lee

Kim

et al. 2020

Sensors

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“…Recently, the combination of carbon dots (CDs) and gold nanoparticles (AuNPs) has been shown to be an effective IFE pair because of the outstanding properties of both materials. CDs are a promising class of fluorescent carbon materials that have attracted considerable interest because of their distinctive properties, such as excellent solubility, low toxicity, good biocompatibility, high photostability, tunable surface functionalities and cell membrane permeability [ 19 , 20 ]. AuNPs have been widely used in fundamental studies for a variety of applications.…”

Section: Introductionmentioning

confidence: 99%

“Turn on” Fluorescence Sensor of Glutathione Based on Inner Filter Effect of Co-Doped Carbon Dot/Gold Nanoparticle Composites

Kim

Park

2021

IJMS

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Glutathione (GSH) is a thiol that plays a significant role in nutrient metabolism, antioxidant defense and the regulation of cellular events. GSH deficiency is related to variety of diseases, so it is useful to develop novel approaches for GSH evaluation and detection. In this study we used nitrogen and phosphorus co-doped carbon dot-gold nanoparticle (NPCD–AuNP) composites to fabricate a simple and selective fluorescence sensor for GSH detection. We employed the reductant potential of the nitrogen and phosphorus co-doped carbon dots (NPCDs) themselves to form AuNPs, and subsequently NPCD–AuNP composites from Au3+. The composites were characterized by using a range of spectroscopic and electron microscopic techniques, including electrophoretic light scattering and X-ray diffraction. The overlap of the fluorescence emission spectrum of NPCDs and the absorption spectrum of AuNPs resulted in an effective inner filter effect (IFE) in the composite material, leading to a quenching of the fluorescence intensity. In the presence of GSH, the fluorescence intensity of the composite was recovered, which increased proportionally to increasing the GSH concentration. In addition, our GSH sensing method showed good selectivity and sensing potential in human serum with a limit of detection of 0.1 µM and acceptable results.

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“…XPS spectra of CDs (Figure 7c) indicated that CDs contain carbon, nitrogen, and oxygen atoms with contents of 65.44%, 9.44%, and 25.11%, respectively. The C 1s spectra (Figure S8a in Supporting Materials) indicated the existence of C=C/C–C (284.36 eV), C–N (285.01 eV), C–Si (285.91 eV), and C=O/C–O (287.98 eV); N 1s spectra (Figure S8b in Supporting Materials) confirmed the presence of N–H (399.22 eV) and C–N (399.89 eV); and O 1s spectra (Figure S8c in Supporting Materials) displayed four functional groups, including O–H (531.26 eV), C=O/C–O (531.90 eV), and O–Si (532.59 eV) [42,43,44]. The XPS spectra demonstrated that APTES was successfully bonded to anhydrous citric acid.…”

Section: Resultsmentioning

confidence: 99%

Vinyl Phosphate-Functionalized, Magnetic, Molecularly-Imprinted Polymeric Microspheres’ Enrichment and Carbon Dots’ Fluorescence-Detection of Organophosphorus Pesticide Residues

Fan

et al. 2019

Polymers

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The rapid detection of organophosphorus pesticide residues in food is crucial to food safety. One type of novel, magnetic, molecularly-imprinted polymeric microsphere (MMIP) was prepared with vinyl phosphate and 1-octadecene as a collection of dual functional monomers, which were screened by Gaussian09W molecular simulation. MMIPs were used to enrich organic phosphorus, which then detected by fluorescence quenching in vinyl phosphate-modified carbon dots (CDs@VPA) originated from anhydrous citric acid. MMIPs and CDs@VPA were characterized by TEM, particle size analysis, FT-IR, VSM, XPS, adsorption experiments, and fluorescence spectrophotometry in turn. Through the fitting data from experiment and Gaussian quantum chemical calculations, the molecular recognition properties and the mechanism of fluorescence detection between organophosphorus pesticides and CDs@VPA were also investigated. The results indicated that the MMIPs could specifically recognize and enrich triazophos with the saturated adsorption capacity 0.226 mmol g−1, the imprinting factor 4.59, and the limit of recognition as low as 0.0006 mmol L−1. Under optimal conditions, the CDs@VPA sensor has shown an extensive fluorescence property with a LOD of 0.0015 mmol L−1 and the linear range from 0.0035 mmol L−1 to 0.20 mmol L−1 (R2 = 0.9988) at 390 nm. The mechanism of fluorescence detection of organic phosphorus with CDs@VPA sensor might be attributable to hydrogen bonds formed between heteroatom O, N, S, or P, and the O−H group, which led to fluorescent quenching. Meanwhile, HN−C=O and Si−O groups in CDs@VPA system might contribute to cause excellent blue photoluminescence. The fluorescence sensor was thorough successfully employed to the detection of triazophos in cucumber samples, illustrating its tremendous value towards food sample analysis in complex matrix.

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One-step synthesized fluorescent nitrogen doped carbon dots from thymidine for Cr (VI) detection in water

Cited by 47 publications

References 42 publications

Detection of Ferric Ions and Catecholamine Neurotransmitters via Highly Fluorescent Heteroatom Co-Doped Carbon Dots

Detection of Ferric Ions and Catecholamine Neurotransmitters via Highly Fluorescent Heteroatom Co-Doped Carbon Dots

“Turn on” Fluorescence Sensor of Glutathione Based on Inner Filter Effect of Co-Doped Carbon Dot/Gold Nanoparticle Composites

Vinyl Phosphate-Functionalized, Magnetic, Molecularly-Imprinted Polymeric Microspheres’ Enrichment and Carbon Dots’ Fluorescence-Detection of Organophosphorus Pesticide Residues

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