A highly selective and sensitive “on-off-on” fluorescent probe for detecting Hg(II) based on Au/N-doped carbon quantum dots

Meng, Alan; Xu, Qinhai; Zhao, Kun; Li, Zhenjiang; Liang, Jun; Li, Qingdang

doi:10.1016/j.snb.2017.08.028

Cited by 79 publications

(24 citation statements)

References 41 publications

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“…Fluorescence intensity difference (ΔF = I′ − I′ 0 ) decreases with the increase in OTC concentration, where I′ and I′ 0 were, respectively, the fluorescence intensity of N-CQDs in the absence and presence of OTC. ON-CQDs ( Figure 9 a) and WN-CQDs ( Figure 9 b), respectively, an OTC concentration of 2–100 µmol L −1 and 0.25–100 µmol L −1 showed a good linear relationship within the scope of the linear regression equation, respectively, ΔF = 0.733 C(µmol L −1 ) + 338.09 and ΔF = 9.2622 C (µmol L −1 ) + 358.52, and the linear correlation coefficient (R 2 ) were 0.9921 and 0.9903, respectively [ 71 , 72 ]. Furthermore, the detection limit was calculated to be 0.973 µmol L −1 (ON-CQDs) and 0.077 µmol L −1 (WN-CQDs) based on 3σ/k, where σ and k represent the standard deviation and slope of the curve, respectively.…”

Section: Resultsmentioning

confidence: 99%

Green Preparation of Fluorescent Nitrogen-Doped Carbon Quantum Dots for Sensitive Detection of Oxytetracycline in Environmental Samples

Gao

Wang

et al. 2020

Nanomaterials

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Nitrogen-doped carbon quantum dots (N-CQDs) with strong fluorescence were prepared by a one-step hydrothermal method using natural biomass waste. Two efficient fluorescent probes were constructed for selective and sensitive detection of oxytetracycline (OTC). The synthesized N-CQDs were characterized by UV-visible absorption spectra, fluorescence spectra, Fourier transform infrared spectroscopy (FT-IR), X-ray photon spectroscopy (XPS), atomic force microscopy (AFM), and high-resolution transmission electron microscopy (HRTEM), which proved that the synthesized N-CQDs surface were functionalized and had stable fluorescence performance. The basis of N-CQDs detection of OTC was discussed, and various reaction conditions were studied. Under optimized conditions, orange peel carbon quantum dots (ON-CQDs) and watermelon peel carbon quantum dots (WN-CQDs) have a good linear relationship with OTC concentrations in the range of 2–100 µmol L−1 and 0.25–100 µmol L−1, respectively. ON-CQDs and WN-CQDs were both successfully applied in detecting the OTC in pretreated tap water, lake water, and soil, with the recovery rate at 91.724–103.206%, and the relative standard deviation was less than 5.35%. The results showed that the proposed N-CQDs proved to be green and simple, greatly reducing the detection time for OTC in the determination environment.

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Section: Resultsmentioning

confidence: 99%

Green Preparation of Fluorescent Nitrogen-Doped Carbon Quantum Dots for Sensitive Detection of Oxytetracycline in Environmental Samples

Gao

Wang

et al. 2020

Nanomaterials

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“…The PL spectrum of samples was recorded using a fluorescence spectrophotometer (RF-6000, Shimadzu). The PL QY of the N-CDs was calculated using the following equation [ 5 , 37 ]:

where the

is the PL QY, the subscript “ st ” denotes the reference quinine sulfate, “ I ” is the integrated fluorescence intensity, “ A ” is the UV-Vis absorption intensity at 365 nm, “ n ” is the different refractive index of the solvent, and the superscript “2” means the square of “ n ”. QS (PL QY is 0.54 at 365 nm) was used as the standard.…”

Section: Methodsmentioning

confidence: 99%

“…Water pollution by heavy metal ions due to the emission of industrial waste presents a major environmental problem [ 1 , 2 , 3 ]. In particular, the mercury ion (Hg 2+ ) is one of the most prevalent and dangerous pollutants, with the character of easy bioaccumulation and high toxicity, which causes serious health and environment problems, including damage to the nervous system, ecosystem, brain, and heart [ 4 , 5 , 6 , 7 ]. Furthermore, the water soluble Hg 2+ is one of the most common forms in mercury pollution, which is hard to remove once released into the environment or getting into the human body due to its non-biodegradability [ 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Highly Photoluminescent and Stable N-Doped Carbon Dots as Nanoprobes for Hg2+ Detection

Rao

Tang

et al. 2018

Nanomaterials

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We developed a microreactor with porous copper fibers for synthesizing nitrogen-doped carbon dots (N-CDs) with a high stability and photoluminescence (PL) quantum yield (QY). By optimizing synthesis conditions, including the reaction temperature, flow rate, ethylenediamine dosage, and porosity of copper fibers, the N-CDs with a high PL QY of 73% were achieved. The PL QY of N-CDs was two times higher with copper fibers than without. The interrelations between the copper fibers with different porosities and the N-CDs were investigated using X-ray photoelectron spectroscopy (XPS) and Fourier Transform infrared spectroscopy (FTIR). The results demonstrate that the elemental contents and surface functional groups of N-CDs are significantly influenced by the porosity of copper fibers. The N-CDs can be used to effectively and selectively detect Hg2+ ions with a good linear response in the 0~50 μM Hg2+ ions concentration range, and the lowest limit of detection (LOD) is 2.54 nM, suggesting that the N-CDs have great potential for applications in the fields of environmental and hazard detection. Further studies reveal that the different d orbital energy levels of Hg2+ compared to those of other metal ions can affect the efficiency of electron transfer and thereby result in their different response in fluorescence quenching towards N-CDs.

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“…XPS spectra of O 1s show peaks at 529.6, 530.9 and 532.7 eV corresponds to Co−O, C−O and C−O‐H, respectively (Figure b,e, S3). XPS spectra of Au clearly exhibited two binding energy peaks at 84.1 (4f 7/2 ) and 87.8 (4f 5/2 ) eV and indicates metallic state of gold (Figure c,f, S3) . XPS spectra of C 1s showed peaks at 284.3, 285.5 and 288.5 eV correspond to C−C, C−O‐C and O−C=O, respectively.…”

Section: Figurementioning

confidence: 99%

Highly Enhanced OER Activity of Amorphous Co₃O₄ via Fabricating Hybrid Amorphous‐Crystalline Gold Nanostructures

et al. 2020

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Hybrid nanostructures of amorphous cobalt oxide (Co3O4) and crystalline gold nanoparticles (AuNPs) showed strongly enhanced OER activity compared to pure amorphous Co3O4. Particularly, gold nanorods (Au NRs) integrated amorphous Co3O4 nanostructures (aCo3O4/Au NRs) required significantly low overpotential (225 mV) to produce geometric current density and needed 336 and 398 mV for achieving current density of 100 and 400 mA/cm2, respectively. Further, aCo3O4/Au NRs displayed good stability over 40 h at 336 mV.

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A highly selective and sensitive “on-off-on” fluorescent probe for detecting Hg(II) based on Au/N-doped carbon quantum dots

Cited by 79 publications

References 41 publications

Green Preparation of Fluorescent Nitrogen-Doped Carbon Quantum Dots for Sensitive Detection of Oxytetracycline in Environmental Samples

Green Preparation of Fluorescent Nitrogen-Doped Carbon Quantum Dots for Sensitive Detection of Oxytetracycline in Environmental Samples

Highly Photoluminescent and Stable N-Doped Carbon Dots as Nanoprobes for Hg2+ Detection

Highly Enhanced OER Activity of Amorphous Co₃O₄ via Fabricating Hybrid Amorphous‐Crystalline Gold Nanostructures

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A highly selective and sensitive “on-off-on” fluorescent probe for detecting Hg(II) based on Au/N-doped carbon quantum dots

Cited by 79 publications

References 41 publications

Green Preparation of Fluorescent Nitrogen-Doped Carbon Quantum Dots for Sensitive Detection of Oxytetracycline in Environmental Samples

Green Preparation of Fluorescent Nitrogen-Doped Carbon Quantum Dots for Sensitive Detection of Oxytetracycline in Environmental Samples

Highly Photoluminescent and Stable N-Doped Carbon Dots as Nanoprobes for Hg2+ Detection

Highly Enhanced OER Activity of Amorphous Co3O4 via Fabricating Hybrid Amorphous‐Crystalline Gold Nanostructures

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Highly Enhanced OER Activity of Amorphous Co₃O₄ via Fabricating Hybrid Amorphous‐Crystalline Gold Nanostructures