S,N-Doped carbon dots for tetracyclines sensing with a fluorometric spectral response

Xing, Xuejian; Huang, Li; Zhao, Shaojing; Xiao, Jiangnan; Lan, Minhuan

doi:10.1016/j.microc.2020.105065

Cited by 79 publications

(19 citation statements)

References 41 publications

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“…The respective constants, K SV , for TCs were fitted as (1.794− 3.680) × 10 4 M −1 for 1 and (1.711−3.514) × 10 4 M −1 for 2 in a linear range of 0−33.23 μmol L −1 (Figures 5 and 6 and Table 4). The calculated K sv value of 1 for TET was the highest (3.68 × 10 4 M −1 ) among the K sv constants of four different TCs, which was comparable to those for previously reported materials, such as QD/MS/NIP, 56 S,N-CDs, 57 AuCuNCs@ ZIF-8, 58 and Al-MOF@Mo/Zn-MOF 59 (Table S6). The LOD values of TCs were found to be 8.97−18.39 μmol L −1 for 1 and 9.39−19.29 μmol L −1 for 2 in a linear region of 0−33.23 μmol L −1 , respectively (Table 4).…”

Section: ■ Experimental Sectionsupporting

confidence: 87%

Fluorine-Substituted Regulation in Two Comparable Isostructural Cd(II) Coordination Polymers: Enhanced Fluorescence Detection for Tetracyclines in Water

Wang

Zhang

Yang

et al. 2021

Crystal Growth & Design

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The two functional fluorinated ligands 2-fluoro-4-(1H-tetrazol-5-yl)benzoic acid (2-F-H2tzba) and 3-fluoro-4-(1H-tetrazol-5-yl)benzoic acid (3-F-H2tzba) were obtained by modifying 4-(1H-tetrazol-5-yl)benzoic acid (H2tzba) embedded with fluorine. Two isostructural 3D Cd2+ coordination polymers (CPs), {[Cd(2-F-tzba)(H2O)]·1.5H2O} n (1) and {[Cd(3-F-tzba)(H2O)]·1.5H2O} n (2), were constructed using the hydrothermal method, in which the binuclear clusters [Cd2(tetrazolate)2] serving as 6-connected secondary building units (SBUs) are linked by six ligands to generate (3,6)-connected (4·62)2(42·610·83)-rtl binodal 3D nets. Compounds 1 and 2 simultaneously show excellent chemical and thermal stability in water systems at different pH levels (pH 3–10). The calculated structures for the ligands and compounds were further investigated by density functional theory (DFT) calculations to compare the structures and fluorescence properties of two fluorine-decorated skeletons. In comparison to 2, 1 displayed more efficient fluorescence sensing toward tetracycline (TET), doxycycline (DOX), oxytetracycline (OTC), and chlortetracycline (CTC) in water systems with a lower low detection limit (LOD) and a rapid response. The fluorescence quenching mechanism was explored through a combination of experimental data and DFT calculations.

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Section: ■ Experimental Sectionsupporting

confidence: 87%

Fluorine-Substituted Regulation in Two Comparable Isostructural Cd(II) Coordination Polymers: Enhanced Fluorescence Detection for Tetracyclines in Water

Wang

Zhang

Yang

et al. 2021

Crystal Growth & Design

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“…2), the broad vibration band in the region of 2800-3440 cm -1 was attributed to stretching vibrations of O-H and N-H, indicating the good hydrophilic nature of N,S-CDs which is contributed to the amino and carboxyl groups on the surface of the carbon dot 35 . The characteristic peaks at 1700, 1541, and 1401 cm -1 confirmed the presence of C=O, C=C, and C-N 33 , respectively. The C-S stretching at 1180 cm -1 and the above results indicate that DA-S,N-CDs have a reliable anti-interference ability and show high specificity toward Fe 3+ and Fe 2+ .…”

Section: Characterization Of Dopamine Functionalized Sn-cdsmentioning

confidence: 80%

Dopamine Functionalized S,N Co-doped Carbon Dots as a Fluorescent Sensor for the Selective Detection of Fe3+ and Fe2+ in Water

et al. 2020

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In current work, a novel functionalized carbon dots has been designed and synthesized by covalently linking dopamine to the surface of S,N co-doped carbon dots (DA-S,N-CDs) for selective detection of Fe 3+ and Fe 2+ in water. The as-synthesized DA-S,N-CDs emit blue fluorescence peaked at 470 nm and exhibit excitation-dependent tunable emissions. The tolerance towards pH, salt, and UV irradiation of synthesized carbon dots reveals excellent stability. Upon exposure to Fe 3+ or Fe 2+ , the fluorescence of DA-S,N-CDs was selectively quenched, while other competitive cations did not change significantly. Under the optimal experimental conditions, the fluorescence intensity of DA-S,N-CDs showed a good linear relationship with the concentration of Fe 3+ and Fe 2+ (5-200 μM for Fe 3+ and 5-300 μM for Fe 2+ ), and the limit of detection was 2.86 μM and 2.06 μM, respectively. Furthermore, considering the excellent stability and anti-interference, DA-S,N-CDs have been successfully used for the detection of Fe 3+ and Fe 2+ in environmental water.

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“…As can be seen in Figure S2A, a wide UV‐vis spectrum of CoOOH nanosheets appeared at the range 250–450 nm overlaps with the excitation (350 nm) and emission (420 nm) fluorescence peaks of S,N‐CDs. Therefore, the fluorescence quenching of S,N‐CDs can be attributed to the inner filter effect (IFE) [ 35 ] and/or fluorescence resonance energy transfer (FRET) [ 36 ] phenomena. To distinguish the quenching mechanism, we investigated the effect of different concentrations of CoOOH nanosheets on the fluorescence intensity of S,N‐CDs and obtained the Stern–Volmer plot (Figure S2B(a)).…”

Section: Resultsmentioning

confidence: 99%

A turn off–on fluorometric and paper‐based colorimetric dual‐mode sensor for isoniazid detection

2021

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In the present study, cobalt oxyhydroxide (CoOOH) nanosheets were applied for establishing a dual fluorometric and smartphone‐paper‐based colorimetric method to detect isoniazid. CoOOH nanosheets quenched the fluorescence emission of sulfur and nitrogen co‐doped carbon dots (S,N‐CDs) due to inner filter effect (IFE). The quenched fluorescence intensity of S,N‐CDs restored in the presence of isoniazid due to destroying CoOOH nanosheets by this drug. Moreover, with adding isoniazid the solution color of CoOOH nanosheets altered from brownish yellow to pale yellow. We exploited these facts to design a turn off–on fluorometric and paper‐based colorimetric sensor for isoniazid measurement at the range 0.5–5 and 5–100 μM with detection limits of 0.28 μM and 4.0 μM, respectively. The introduced dual sensor was used for pharmaceutical, environmental and biological analysis of isoniazid with satisfactory results. The paper‐based colorimetric sensor can be applied for isoniazid portable monitoring using a smartphone as a detector or even the naked eye.

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S,N-Doped carbon dots for tetracyclines sensing with a fluorometric spectral response

Cited by 79 publications

References 41 publications

Fluorine-Substituted Regulation in Two Comparable Isostructural Cd(II) Coordination Polymers: Enhanced Fluorescence Detection for Tetracyclines in Water

Fluorine-Substituted Regulation in Two Comparable Isostructural Cd(II) Coordination Polymers: Enhanced Fluorescence Detection for Tetracyclines in Water

Dopamine Functionalized S,N Co-doped Carbon Dots as a Fluorescent Sensor for the Selective Detection of Fe3+ and Fe2+ in Water

A turn off–on fluorometric and paper‐based colorimetric dual‐mode sensor for isoniazid detection

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