Novel S, N-doped carbon quantum dot-based "off-on" fluorescent sensor for silver ion and cysteine

Liao, Sen; Zhao, Xinyi; Zhu, Fawei; Chen, Miao; Wu, Zhiliang; Song, Xiangzhi; Ye, Hua; Chen, Xiaoqing

doi:10.1016/j.talanta.2017.12.040

Cited by 128 publications

(42 citation statements)

References 43 publications

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“…The nitrogen-doped CDs resulted in improvement in the electronic characteristics and surface chemical activities. In an interesting work by Liao et al, N-and S-doped carbon dots have been prepared directly from citric acid and thiamine hydrochloride via a one-step hydrothermal protocol in 63.8% quantum yield [21].…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…Many researchers have studied the influence of reaction temperature on the optical properties of CDs. We summarized some results in Figure 2, according to the published literature [6,25,[29][30][31][32][33][34]. Figure 2a-e show that the QY of the prepared CDs can usually reach a maximum when the hydrothermal temperature (HyT) is set in the range from~150 to~200 • C. The correlation between QY and HyT is the main reason why 160, 180, or 200 • C are the typical values selected for the preparation of CDs in many papers.…”

Section: Carbonization Temperature Vs Optical Propertiesmentioning

confidence: 99%

“…Many researchers have studied the influence of reaction temperature on the optical properties of CDs. We summarized some results in Figure 2, according to the published literature [6,25,[29][30][31][32][33][34] In this review, we focused on CDs obtained via CA as the main precursor with the purpose to explore the chemistry behind the synthesis. Citric acid, among the various precursors of CDs, is undoubtedly one of the most used, as the abundant scientific literature on the topic demonstrates.…”

Section: Carbonization Temperature Vs Optical Propertiesmentioning

confidence: 99%

Citric Acid Derived Carbon Dots, the Challenge of Understanding the Synthesis-Structure Relationship

Ren

Malfatti

Innocenzi

2020

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Carbon dots (CDs) are highly-emissive nanoparticles obtained through fast and cheap syntheses. The understanding of CDs’ luminescence, however, is still far from being comprehensive. The intense photoluminescence can have different origins: molecular mechanisms, oxidation of polyaromatic graphene-like layers, and core-shell interactions of carbonaceous nanoparticles. The citric acid (CA) is one of the most common precursors for CD preparation because of its high biocompatibility, and this review is mainly focused on CA-based CDs. The different parameters that control the synthesis, such as the temperature, the reaction time, and the choice of solvents, were critically described. Particular attention was devoted to the CDs’ optical properties, such as tunable emission and quantum yields, in light of functional applications. The survey of the literature allowed correlating the preparation methods with the structures and the properties of CA-based CDs. Some basic rules to fabricate highly luminescent nanoparticles were selected by the metanalysis of the current literature in the field. In some cases, these findings can be generalized to other types of CDs prepared via liquid phase.

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“…Therefore, a simple method for detecting Ag + ions is needed. Fluorescent chemosensors for Ag + have attracted great attention because of their high sensitivity, lower cost, high detection limits, and essential simplicity . To date, fluorescent chemosensors for Ag + have developed rapidly .…”

Section: Introductionmentioning

confidence: 99%

Two‐channel near‐infrared fluorescence Ag⁺ ion sensing of a new star‐shaped dendrimer

Cheng

Yang²,

Zhang

et al. 2019

Luminescence

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A new near-infrared fluorescence sensor PDI-PD for Ag + ions was successfully prepared and its structure characterized by 1 H nuclear magnetic resonance (NMR), 13 C NMR and high-resolution mass spectrometry; matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (HRMS MALDI-TOF). The probe exhibited rapid, sensitive, and selective two-channel fluorescence responses towards Ag + ions and protons. The probe has a marked high binding affinity and high sensitivity for Ag + , with a detection limit of 1.4 × 10 −6 M. An approximately five-fold enhanced core emission at 784 nm was attributed to fluorescence resonance energy transfer (FRET). The enhanced core emission of the probe with Ag + ions based on photo-induced electron transfer and FRET is discussed. In addition, the probe presented a visible colour change. All experimental results demonstrated that PDI-PD is an efficient tool for the selective, sensitive and rapid detection of Ag + ions and protons using two-channel fluorescence responses.

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Novel S, N-doped carbon quantum dot-based "off-on" fluorescent sensor for silver ion and cysteine

Cited by 128 publications

References 43 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

Citric Acid Derived Carbon Dots, the Challenge of Understanding the Synthesis-Structure Relationship

Two‐channel near‐infrared fluorescence Ag⁺ ion sensing of a new star‐shaped dendrimer

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Novel S, N-doped carbon quantum dot-based "off-on" fluorescent sensor for silver ion and cysteine

Cited by 128 publications

References 43 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

Citric Acid Derived Carbon Dots, the Challenge of Understanding the Synthesis-Structure Relationship

Two‐channel near‐infrared fluorescence Ag+ ion sensing of a new star‐shaped dendrimer

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Product

Resources

About

Two‐channel near‐infrared fluorescence Ag⁺ ion sensing of a new star‐shaped dendrimer