Hydrothermal synthesis of fluorescent carbon dots from sodium citrate and polyacrylamide and their highly selective detection of lead and pyrophosphate

Liu, Yongli; Zhou, Qingxiang; Yuan, Yali; Wu, Yiping

doi:10.1016/j.carbon.2017.01.035

Cited by 210 publications

(94 citation statements)

References 53 publications

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“…These results are in fair agreement with the one obtained by Lu et al who prepared N-doped carbon dots from hydrothermal treatment of citric acid in the presence of poly ethylenimine and reported a 2θ value of 20° for CDs [33]. In an almost similar report, [34], XRD analysis of CDs obtained from hydrothermal treatment of sodium citrate and poly(acrylamide) exhibited a broad low intensity diffraction peak at 20.66°, indicating existence of amorphous carbon. Similarly, He et al prepared carbon dots from sodium salt of EDTA and reported a broad peak around 24.4°, corresponding to 0.363 nm interlayer spacing of CDs.…”

Section: Characterization Of N-cdssupporting

confidence: 91%

Blue light-emitting carbon dots (CDs) from a milk protein and their interaction with Spinacia oleracea leaf cells

Bajpai

D'Souza²,

Suhail

2019

Int Nano Lett

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The milk protein casein (Cas) has been employed as carbon resource material to synthesize nitrogen-doped carbon dots (N-CDs) via microwave exposure. The dots, when exposed to UV light, produced blue fluorescence. The N-CDs were characterized by ultra violet (UV) spectroscopy, Fourier transformation infrared spectroscopy, X-ray diffraction (XRD), dynamic light scattering analysis, fluorescent microscopy (FM), and transmission electron microscopy (TEM). The XRD analysis revealed a broad peak at 2θ = 20°, thus indicating the turbostratic carbon phase. TEM analysis and particle size distribution curve revealed that nearly, 85% of the particles had diameter below 10 nm and the particles had spherical geometry. The HRTEM analysis revealed that carbon dots exhibited lattice fringes with a d-spacing of 0.21 nm, corresponding to the (100) plane lattice of graphite. The fluorescence spectral studies indicated a red shift in the emission peak from 420 to 450 nm as the excitation wavelength increased from 300 to 340 nm. The zeta potential of particles was found to be -11.3 mV. Finally, impregnation of N-CDs was studied in Spinacia oleracea leaf. It was observed that as the concentration of N-CDs' solution increased, percent insertion (PI) also increased, but the time required for maximal insertion decreased with increasing concentrations of N-CDs in the feed solutions. In the carbon dots' solution with a concentration of 200 ppm, maximum percent insertion (MPI) was obtained after 80 min. However, with the increasing concentration of N-CDs in the feed solutions, time of getting MPI reduced, i.e., in 600 ppm, it was 30 min, and in 800 ppm, it was 10 min.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Section: Characterization Of N-cdssupporting

confidence: 91%

Blue light-emitting carbon dots (CDs) from a milk protein and their interaction with Spinacia oleracea leaf cells

Bajpai

D'Souza²,

Suhail

2019

Int Nano Lett

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“…The strong absorption peak at 1580 cm À1 is attributed to the C=Os tretching vibration and that of 1400 cm À1 is from COO-group. [22][23][24][25] The full survey XPS spectrum manifests that carbon,o xygen and sodium are presented at the surface of the obtained solid CDs (Figure 2b). The presence of the Na KLL peak suggests that Na is still bound to oxygen, which further confirms the existence of the carboxylate groups in the obtained solid CDs.…”

Section: Resultsmentioning

confidence: 96%

“…FT‐IR (Figure a) and XPS (Figure b–f) spectra are used to identify the chemical structure and elemental composition of the solid CDs. The broad absorption band between 3200 and 3700 cm −1 in the FT‐IR spectrum of the solid CDs is assigned to the stretching vibrations of O‐H, which is responsible for the hydrophilicity of CDs. The strong absorption peak at 1580 cm −1 is attributed to the C=O stretching vibration and that of 1400 cm −1 is from COO‐group .…”

Section: Resultsmentioning

confidence: 99%

“…The broad absorption band between 3200 and 3700 cm −1 in the FT‐IR spectrum of the solid CDs is assigned to the stretching vibrations of O‐H, which is responsible for the hydrophilicity of CDs. The strong absorption peak at 1580 cm −1 is attributed to the C=O stretching vibration and that of 1400 cm −1 is from COO‐group . The full survey XPS spectrum manifests that carbon, oxygen and sodium are presented at the surface of the obtained solid CDs (Figure b).…”

Section: Resultsmentioning

confidence: 99%

“…FT-IR results indicate that carboxyl groups are presented on the surfaceo ft he solid CDs, therefore it is expected Na in the obtained CDs exists in the form of carboxylate. The C 1s spectrum shows three distinct carbon components at 284.6 eV,2 86.0 eV and 288.1 eV (Figure 2c), corresponding to the sp 2 carbon in graphite (CÀC/C=C), sp 2 carbon in CÀO/CÀNa nd C=O, respectively; [22][23][24][25] the two distinct components centred at 530. (Figure 2e)r eveals two different types of nitrogen:t he pyrrolic N( C-N-C) at 399.2 eV and the graphitic N at 399.9 eV,r espectively.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Solid‐State Carbon Dots with Efficient Cyan Emission towards White Light‐Emitting Diodes

Khan

Wang

2018

Chemistry An Asian Journal

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Efficient cyan‐emitting solid carbon dots (CDs) were synthesized via a one‐pot hydrothermal method. The obtained solid CDs show a broad absorption from 270–460 nm with a maximum around 400 nm, and emit intense cyan light around 500 nm with an internal photoluminescence quantum efficiency of 34.1 % under 400 nm excitation. The emission maximum of the solid CDs remains unchanged under 320–400 nm excitations. Compared with dilute aqueous of CDs (2.5 mg mL−1), the emission of solid CDs shows an obvious red‐shift of 50 nm. The red‐shift is caused by resonant energy transfer due to larger spectral overlap and smaller interparticle distance, together with a new surface state caused by aggregation in solid CDs. A lamp with white LEDs was fabricated by dropping a mixture of solid CDs, CaAlSiN3:Eu2+ and silicon resin on the top of a near‐ultraviolet LED chip. Under an operating current of 20 mA, the as‐fabricated white LED generates a high‐quality, warm white light with a color rendering index of 86.1, a color temperature of 4340 K, and a luminescence efficiency of 31.3 lm W−1.

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A Portable Optical Fiber Sensing Platform Based on Fluorescent Carbon Dots for Real‐Time pH Detection

Cai

Wang

Liu

et al. 2021

Adv Materials Inter

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An optical fiber sensing platform based on the nitrogen‐doped carbon dots (N‐CDs) for online detection of pH value in real time has been developed. The pH‐sensitive N‐CDs are synthesized by a one‐pot hydrothermal method. To compose the sensing probe, the N‐CDs are immobilized on the surface of the fiber tip by the biocompatible hydrogel. According to the results of optical simulation, the fiber tip is designed to be tapered for efficient excitation and fluorescence collection. The assembling process of the sensing probe can be accomplished by the method of in‐situ polymerization without any mold in seconds. The fluorescence of the sensing probe can be enhanced or quenched by pH value variation in a certain range and transmits to the spectrometer. The maximum diameter of the proposed sensing probe is only 450 µm. Therefore, the sensing platform with rapid response has great potential application for remote monitoring in the narrow space. Besides, the proposed platform is portable and provides a new photonic‐sensing method for emergency analysis.

show abstract

Hydrothermal synthesis of fluorescent carbon dots from sodium citrate and polyacrylamide and their highly selective detection of lead and pyrophosphate

Cited by 210 publications

References 53 publications

Blue light-emitting carbon dots (CDs) from a milk protein and their interaction with Spinacia oleracea leaf cells

Blue light-emitting carbon dots (CDs) from a milk protein and their interaction with Spinacia oleracea leaf cells

Solid‐State Carbon Dots with Efficient Cyan Emission towards White Light‐Emitting Diodes

A Portable Optical Fiber Sensing Platform Based on Fluorescent Carbon Dots for Real‐Time pH Detection

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