Facile synthesis of graphitic carbon quantum dots with size tunability and uniformity using reverse micelles

Herein, a simple, green, and low-cost way was developed in the synthesis of fluorescent nitrogen-doped carbon nanoparticles (FNCPs) with nitrogen content of 6.88%, using one-pot hydrothermal treatment of strawberry juice. The as-prepared FNCPs exhibited a maximum emission at 427 nm with a quantum yield of 6.3%, which could be specifically quenched by Hg 2+ . This phenomenon was used to develop a fluorescent method for facile detection of Hg 2+ with a linear range from 10 nM to 50 µM and a detection limit of 3 nM (S/N = 3), and further extended to measure environmental water samples with satisfactory recovery. This study provides a green strategy in the synthesis of FNCPs to detect Hg 2+ with good performance.Fluorescent nitrogen-doped carbon nanoparticles (FNCPs) were synthesized by one-pot hydrothermal treatment of strawberry juice. The strategy was simple, green, and low-cost. The as-prepared FNCPs showed some excellent properties such as water-soluble and good stability, which was applied as an Hg 2+ sensor with high sensitivity and selectivity.

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“…2B)shows the lattice plane with an interfringe distance of 0.254 nm, corresponding to the (100) planes of graphitic carbon 47. 2A).…”

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confidence: 99%

One-pot green synthesis of nitrogen-doped carbon nanoparticles as fluorescent probes for mercury ions

et al. 2013

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“…Rhee and co-workers reported the solution-phase synthesis of CQDs using reverse micelles as nanoscale reactors via condensation polymerisation and subsequent carbonization of glucose within AOT micelles at 160 ºC. 24 Control of the water-surfactant ratio within the micelle allowed the CQD diameter to be tuned from 1.8 to 4.1 nm, but with increasing polydispersity at larger diameters. More recently, Rhee et al reported the synthesis of size tunable CQDs using a soft template method.…”

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confidence: 99%

Size controlled synthesis of carbon quantum dots using hydride reducing agents

Linehan

Doyle

2014

J. Mater. Chem. C

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Highly luminescent carbon quantum dots (CQDs) are synthesized at room temperature by hydride reduction of carbon tetrachloride (CCl4) within inverse micelles. Regulation of the average diameter of the allylamine terminated CQDs is achieved by varying the strength of the reducing agent used. Transmission electron microscopy shows that the NCs are highly crystalline with well-defined core diameters tuned from 2 to 6 nm, while FTIR and XPS spectroscopy confirm that the CQDs possess similar surface chemistry. UV-Vis and PL spectroscopy show significant quantum confinement effects, with moderate absorption in the UV spectral range, and a strong, narrow luminescence in the visible with a marked dependency on excitation wavelength. Time resolved photoluminescence measurements showed lifetimes for all CQDs in the ns range, while a maximum PL quantum yield of 27% is observed for the CQDs

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“…Rhee and co-workers reported the solution-phase synthesis of CQDs using reverse micelles as 40 nanoscale reactors. 21 The CQDs were formed via condensation polymerisation and subsequent carbonization of glucose within AOT reverse micelles at 160 ºC. Control of the water-surfactant ratio within the micelle allowed the CQD diameter to be tuned 50 from 1.8 to 4.1 nm, but with increasing polydispersity at larger diameters.…”

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confidence: 99%