Nitrogen-doped graphene quantum dots prepared by electrolysis of nitrogen-doped nanomesh graphene for the fluorometric determination of ferric ions

Yang, Fan; Bao, Weijie; Liu, Tianxing; Zhang, Bing; Huang, Shuo; Yang, Wang; Li, Yun; Li, Na; Wang, Chunxia; Pan, Caiwen; Li, Yongfeng

doi:10.1007/s00604-020-04294-8

Cited by 34 publications

(17 citation statements)

References 42 publications

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“…The ultraviolet–visible (UV–vis, Shimadzu UV-2600) absorption spectrum (red line) in Figure i showed three characteristic absorption peaks. The peaks that emerged at 273 and 337 nm corresponded to π–π* transition of aromatic CC and n−π* transitions, respectively. ,− As for the absorption peak between 452 and 478 nm, it was consistent with previous reports. , The fluorescence spectra of GQDs were also measured using a Fluoromax-4 fluorescence spectrophotometer (Horiba). GQDs exhibited an optimal emission peak at 520 nm under excitation at 450 nm, and the excitation peak overlapped with the UV characteristic peak.…”

Section: Resultssupporting

confidence: 89%

Ratiometric Fluorescent Probe Based on Diazotization-Coupling Reaction for Determination of Clenbuterol

Liu

Xiao

et al. 2020

J. Agric. Food Chem.

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In view of the potential harm caused by illegal feeding of clenbuterol (CLB) in the livestock industry, herein, a novel ratiometric fluorescent probe based on graphene quantum dots (GQDs)@[Ru(bpy) 3 ] 2+ was elaborately constructed for CLB detection. In this probe, GQDs acted as response signals, and their fluorescence was remarkably quenched by CLB through the diazotization-coupling reaction. As for [Ru(bpy) 3 ] 2+ as a reference signal, its fluorescence was hardly affected. The intensity ratio of two fluorophores showed good linearity with CLB concentration in the range of 0.05−40 μM, accompanied by visualization of fluorescence variation from yellow to red. The detection limit was as low as 0.029 μM. Particularly, the probe was successfully used to detect CLB in pork and beef samples with satisfactory recoveries. To our knowledge, this is the first report on a ratiometric fluorescent probe for the detection of CLB, which possesses broad application prospects in food safety risk monitoring.

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Section: Resultssupporting

confidence: 89%

Ratiometric Fluorescent Probe Based on Diazotization-Coupling Reaction for Determination of Clenbuterol

Liu

Xiao

et al. 2020

J. Agric. Food Chem.

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“… 36,37 The peak at 527.8 eV in O 1s XPS is assigned to the surface lattice oxygen (O 2− ) combined with Cr 3+ . 38,39 The N 1s XPS verifies the structures of graphitic N, pyrrolic N, and pyridinic N, which are identical to our previously reported NG ( Fig. 3d ).…”

Section: Resultssupporting

confidence: 89%

Boosting the hydrogen evolution reaction activity of Ru in alkaline and neutral media by accelerating water dissociation

Tang

Zhang

et al. 2021

RSC Adv.

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“…Also, they showed that the 3-fsa-MSNT and 5-fsa-MSNT sensors have a relatively low limit of detection compared to other previously reported fluorometric sensors (Table ). − …”

Section: Results and Discussionmentioning

confidence: 99%

Spectrophotometric and Fluorometric Methods for the Determination of Fe(III) Ions in Water and Pharmaceutical Samples

2021

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Chemical sensors based on mesoporous silica nanotubes (MSNTs) for the quick detection of Fe(III) ions have been developed. The nanotubes’ surface was chemically modified with phenolic groups by reaction of the silanol from the silica nanotubes surface with 3-aminopropyltriethoxysilane followed by reaction with 3-formylsalicylic acid (3-fsa) or 5-formylsalicylic acid (5-fsa) to produce the novel nanosensors. The color of the resultant 3-fsa-MSNT and 5-fsa-MSNT sensors changes once meeting a very low concentration of Fe(III) ions. Color changes can be seen by the naked eye and tracked with a smartphone or fluorometric or spectrophotometric techniques. Many experimental studies have been conducted to find out the optimum conditions for colorimetric and fluorometric determining of the Fe(III) ions by the two novel sensors. The response time, for the two sensors, that is necessary to achieve a steady spectroscopic signal was less than 15 s. The suggested methods were validated in terms of the lowest limit of detection (LOD), the lowest limit of quantification (LOQ), linearity, and precision according to International Conference on Harmonization (ICH) guidelines. The lowest limit of detection that was obtained from the spectrophotometric technique was 18 ppb for Fe(III) ions. In addition, the results showed that the two sensors can be used eight times after recycling using 0.1 M EDTA as eluent with high efficiency (90%). As a result, the two sensors were successfully used to determine Fe(III) in a variety of real samples (tap water, river water, seawater, and pharmaceutical samples) with great sensitivity and selectivity.

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Nitrogen-doped graphene quantum dots prepared by electrolysis of nitrogen-doped nanomesh graphene for the fluorometric determination of ferric ions

Cited by 34 publications

References 42 publications

Ratiometric Fluorescent Probe Based on Diazotization-Coupling Reaction for Determination of Clenbuterol

Ratiometric Fluorescent Probe Based on Diazotization-Coupling Reaction for Determination of Clenbuterol

Boosting the hydrogen evolution reaction activity of Ru in alkaline and neutral media by accelerating water dissociation

Spectrophotometric and Fluorometric Methods for the Determination of Fe(III) Ions in Water and Pharmaceutical Samples

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