Sensitive and selective turn-off-on fluorescence detection of Hg2+ and cysteine using nitrogen doped carbon nanodots derived from citron and urine

Xavier, Sheena; Siva, G.; Annaraj, Jamespandi; Kim, Ae Rhan; Yoo, Dong Jin; kumar, G. Gnana

doi:10.1016/j.snb.2017.12.046

Cited by 57 publications

(24 citation statements)

References 55 publications

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“…Zhang and co-workers [ 34 ] synthesized nitrogen-doped CDs (N-CDs) with strong blue luminescence, achieving a PL QY of 35.4%. Xavier’s group [ 35 ] developed an environmentally friendly and high efficient fluorescence sensor based on N-CDs. The as-prepared N-CDs with a PL QY of 34.5% showed an excellent selectivity towards Hg 2+ ions.…”

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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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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“…Identically, with the addition of the polar and positively charged amino acid such as lys, the polar and negative charged amino acid such as glu, polar neutral amino acids such as gly and thr, the emission intensity of the 1 ‐based Cu 2+ ‐quenching system could be hardly enhanced due to the lack of chelation interaction with the Cu 2+ ion (Figure b) ,. [10a], The above results fully prove that the 1 ‐based Cu 2+ ‐quenching system is selective to detect cys. Furthermore, we measured the FL emission spectra the 1 ‐based Cu 2+ ‐quenching system in different concentrations (0.02–0.32 m m ) of cys, the emission intensities of the system are gradually recovered with the addition of cys (Figure a), which exhibits a linear relation in the range from 0.02 to 0.14 m m .…”

Section: Resultsmentioning

confidence: 99%

“…In addition, cysteine (cys) is one of the amino acids that possess multiple beneficial effects on the human body such as assisting the intracellular redox homeostasis, protein synthesis, and metabolism. The anomalous levels of cys in physiological system result in various hazardous symptoms including liver damage, immunodeficiency syndrome, and brain ischemia . The research on detecting cys has always been a particularly fascinating area.…”

Section: Introductionmentioning

confidence: 99%

A Penta‐Eu^III Sandwiched Dawson Selenotungstate and Its Unique Luminescence Properties

et al. 2020

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A new penta‐EuIII sandwiched Dawson‐type selenotungstate (ST) [H2N(CH3)2]10H3{SeO4Eu5(H2O)8[Se2W14O52]2}·40H2O (1) was constructed by an in‐situ self‐assembly strategy. The unique architectural feature of 1 is that two [Se2W14O52]12– segments graft each other by five Eu3+ ions via oxygen linkers. Meanwhile, a disordered tetra‐coordinate SeIV ion locates on the central symmetric site of the structure. What's more, based on its benign fluorescence properties and excellent water solubility, 1 was prepared to be an efficient chemosensor for the selective detection of the Cu2+ ion in aqueous solution. The detection was found to be 1.24 × 10–3 mm. The fluorescence quenching mechanism of the Cu2+ ion towards the 1‐based sensor might be caused by the LMCT absorption of the Cu2+ ion hindering energy transfer from ST fragments to the Eu3+ ion in 1 in aqueous solution. More interestingly, the Cu2+‐quenched system could be recovered by addition of cysteine (cys) because the strong chelation between cys and Cu2+. The LOD value of detecting cys is 2.17 × 10–4 mm for the continuous “off‐on” chemosensor, which provides a promising prospect of polyoxometalate‐based materials for environmental monitoring and clinical medical testing.

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“…The uorescence on the distance-based paper device is similar to the behavior of NCDs and Hg 2+ in solution. 15,16,40,45,46 In the UV-vis absorption spectra in Fig. 1a, a new absorption peak appears at 300 nm in the presence of Hg 2+ and higher absorbance intensity was found with increasing Hg 2+ concentration.…”

Section: Characterization Of Ncdsmentioning

confidence: 97%

“…1b (002) reection plane that exhibits a broad diffraction peak at 2q ¼ 20 . 15,40 A study of the functional groups on NCDs was done by FTIR, and the spectra are shown in Fig. S3.…”

Section: Characterization Of Ncdsmentioning

confidence: 99%

Sensitive distance-based paper-based quantification of mercury ions using carbon nanodots and heating-based preconcentration

et al. 2020

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Sensitive and selective turn-off-on fluorescence detection of Hg2+ and cysteine using nitrogen doped carbon nanodots derived from citron and urine

Cited by 57 publications

References 55 publications

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

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

A Penta‐Eu^III Sandwiched Dawson Selenotungstate and Its Unique Luminescence Properties

Sensitive distance-based paper-based quantification of mercury ions using carbon nanodots and heating-based preconcentration

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Sensitive and selective turn-off-on fluorescence detection of Hg2+ and cysteine using nitrogen doped carbon nanodots derived from citron and urine

Cited by 57 publications

References 55 publications

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

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

A Penta‐EuIII Sandwiched Dawson Selenotungstate and Its Unique Luminescence Properties

Sensitive distance-based paper-based quantification of mercury ions using carbon nanodots and heating-based preconcentration

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A Penta‐Eu^III Sandwiched Dawson Selenotungstate and Its Unique Luminescence Properties