Green synthesis of carbon dots functionalized silver nanoparticles for the colorimetric detection of phoxim

Zheng, Mingda; Wang, Chenge; Wang, Yingying; Wei, Wei; Ma, Shuang; Sun, Xiaohan

doi:10.1016/j.talanta.2018.03.066

Cited by 92 publications

(23 citation statements)

References 39 publications

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“…The as-prepared N-CQDs were well-dispersed yellow solution, which exhibited strong blue fluorescence under UV irradiation (365 nm). The N-CQDs contain a large number of nitrogen-containing (-NH 2 ) and oxygen-containing (-OH and -COOH) groups, which can strongly interact with analytes [32]. When iron ions were added to the carbon dot solution, the fluorescence was quenched under UV irradiation (365 nm), which can be discerned by the naked eye.…”

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of Nitrogen-Doped Carbon Quantum Dots with Chitosan for Fluorescent Detection of Fe3+

et al. 2019

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A facile, economical, and one-step hydrothermal method was used to prepare highly luminescent nitrogen-doped carbon quantum dots (N-CQDs) with chitosan as both carbon and nitrogen sources. The as-prepared N-CQDs have an average size of 2 nm and exhibit excitation wavelength-dependent fluorescence with a maximum excitation and emission at 330 and 410 nm, respectively. Furthermore, due to the effective quenching effect of Fe3+ ions, the prepared N-CQDs can be used as a fluorescent sensor for Fe3+ ion-sensitive detection with a detection limit of 0.15 μM. The selectivity experiments revealed that the fluorescent sensor is specific to Fe3+ even with interference by high concentrations of other metal ions. Most importantly, the N-CQD-based Fe3+ ion sensor can be successfully applied to the determination of Fe3+ in real water samples. With excellent sensitivity and selectivity, such stable and cheap carbon materials are potentially suitable for the monitoring of Fe3+ in environmental application.

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Section: Resultsmentioning

confidence: 99%

Facile Synthesis of Nitrogen-Doped Carbon Quantum Dots with Chitosan for Fluorescent Detection of Fe3+

et al. 2019

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“…In addition, the FT‐IR spectrum of AgNPs@SNCD nanocomposites (Figure 4, red curve) had five characteristic absorption bands at 3442, 3388, 2926, 1583, and 1384 cm −1 , respectively, which originated from the stretching vibration of –OH, –NH, C–H, C=O and C–O bonds. [ 33,34 ] These results further demonstrated that AgNPs@SNCDs nanocomposites had been synthesized successfully.…”

Section: Resultsmentioning

confidence: 64%

“…As shown in Figure 3a,b, the zeta potentials of AgNPs and SNCDs were −20.1 and 25.6 mV, respectively, and their surfaces showed completely opposite electronegativity, indicating that SNCDs could be easily attached to the surface of AgNPs through electrostatic interaction, thereby causing the formation of AgNPs@SNCDs nanocomposites and the increase in average diameters. [ 33,34 ] However, the introduction of GSH could effectively destroy the equilibrium state, resulting in the fluorescence recovery of SNCDs.…”

Section: Resultsmentioning

confidence: 99%

Facile synthesis of AgNPs@SNCDs nanocomposites as a fluorescent ‘turn on’ sensor for detection of glutathione

et al. 2020

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The present study illustrates the facile synthesis of silver nanoparticles capped with sulfur and nitrogen co‐doped carbon dots (AgNPs@SNCDs) nanocomposites and their application towards the sensitive and selective detection of glutathione (GSH) using a spectrofluorimetry method. SNCDs were synthesized using solvothermal treatment of cysteamine hydrochloride and p‐phenylenediamine. The as‐fabricated SNCDs were then utilized as capping and stabilizing agents for the preparation of AgNPs@SNCDs nanocomposites using wet chemistry. The size of AgNPs@SNCDs nanocomposites was characterized to be ~37.58 nm or even larger aggregates. Particularly, the quenched fluorescence of AgNPs@SNCDs nanocomposites could be significantly restored upon addition of GSH, and the colour of its solution changed to some extent. The fluorescence intensity ratio of AgNPs@SNCDs nanocomposites at ~450 nm and 550 nm was directly proportional to the GSH concentration within the ranges 8.35–66.83 μM and 66.83–200.5 μM, and the detection limit was 0.52 μM. Furthermore various common organic molecules had no obvious interference in the detection mode. The proposed nanosensor was successfully applied for GSH assay in actual water samples.

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“…Researchers have also explored FCNPs as sensors for more complex chemicals (Asadian et al, 2019). For example, CQDs were used to probe the anthropogenic pollutants 2,4-dinitrophenol (LOD 400 μg/l), 2-amino-3,4,8-trimethyl-3H-imidazo [4,5-f] Zheng et al, 2018). Similarly, complex GQD sensors have been reported for the antioxidant quercetin as well as the pollutants 4-nitrophenol and paraoxon (LOD 23.5, 43.6 and 39.7 μM, respectively;Alvarez-Diduk, Orozco & Merkoçi, 2017), the plant cytokinin zeatin (LOD 3.1 × 10 −5 μM; and the antibiotic tetracycline (LOD 0.95 μg/l; Zhang et al, 2020).…”

Section: (D) Fungimentioning

confidence: 99%

Fluorescent nanoparticles as tools in ecology and physiology

et al. 2021

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Fluorescent nanoparticles (FNPs) have been widely used in chemistry and medicine for decades, but their employment in biology is relatively recent. Past reviews on FNPs have focused on chemical, physical or medical uses, making the extrapolation to biological applications difficult. In biology, FNPs have largely been used for biosensing and molecular tracking. However, concerns over toxicity in early types of FNPs, such as cadmium-containing quantum dots (QDs), may have prevented wide adoption. Recent developments, especially in non-Cd-containing FNPs, have alleviated toxicity problems, facilitating the use of FNPs for addressing ecological, physiological and molecule-level processes in biological research. Standardised protocols from synthesis to application and interdisciplinary approaches are critical for establishing FNPs in the biologists' tool kit. Here, we present an introduction to FNPs, summarise their use in biological applications, and discuss technical issues such as data reliability and biocompatibility. We assess whether biological research can benefit from FNPs and suggest ways in which FNPs can be applied to answer questions in biology. We conclude that FNPs have a great potential for studying various biological processes, especially tracking, sensing and imaging in physiology and ecology.

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Green synthesis of carbon dots functionalized silver nanoparticles for the colorimetric detection of phoxim

Cited by 92 publications

References 39 publications

Facile Synthesis of Nitrogen-Doped Carbon Quantum Dots with Chitosan for Fluorescent Detection of Fe3+

Facile Synthesis of Nitrogen-Doped Carbon Quantum Dots with Chitosan for Fluorescent Detection of Fe3+

Facile synthesis of AgNPs@SNCDs nanocomposites as a fluorescent ‘turn on’ sensor for detection of glutathione

Fluorescent nanoparticles as tools in ecology and physiology

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