Ultrasensitive detection of mercury(II) ion using CdTe quantum dots in sol-gel-derived silica spheres coated with calix[6]arene as fluorescent probes

Li, Tao; Zhou, Yue; Sun, Junyong; Tang, Dongbao; Guo, Shixue; Ding, Xueping

doi:10.1007/s00604-011-0655-7

Cited by 54 publications

(14 citation statements)

References 37 publications

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“…Fluorescence spectrophotometry can be applied for the determination of the analytes at low concentration. Some new methods based on fluorescence-based probes and sensors for determination of Hg 2+ have been reported, such as DNAzymes [11], oligonucleotide platforms [12], CdTe quantum dots [13]. However, nucleic acid or enzyme sensors are rather costly.…”

Section: Introductionmentioning

confidence: 99%

Determination of mercury(II) by surface-enhanced Raman scattering spectroscopy based on thiol-functionalized silver nanoparticles

et al. 2012

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Silver nanoparticles (Ag NPs) modified with sodium 2-mercaptoethanesulfonate (mesna) exhibit strong surface-enhanced Raman scattering (SERS). Their specific and strong interaction with heavy metal ions led to a labelfree assay for Hg(II). The covalent bond formed between mercury and sulfur is stronger than the one between silver and sulfur and thus prevents the adsorption of mesna on the surface of Ag NPs. This results in a decrease of the intensity of SERS in the presence of Hg(II) ions. The Raman peak at 795 cm −1 can be used for quantification. The effect of the concentration of mesna, the concentration of sodium chloride, incubation time and pH value on SERS were optimized. Under the optimal conditions, the intensity of SERS decreases with increasing concentration of Hg(II). The decrease is linear in the 0.01 and 2 μmol L −1 concentration range, with a correlation coefficient (R 2 ) of 0.996 and detection limit (S/N03) is 0.0024 μmol L −1 . The method was successfully applied to the determination of the Hg(II) in spiked water samples.

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Section: Introductionmentioning

confidence: 99%

Determination of mercury(II) by surface-enhanced Raman scattering spectroscopy based on thiol-functionalized silver nanoparticles

et al. 2012

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“…39 Similarly, but working in aqueous solution, Li et al developed a simple method for the preparation of highly fluorescent and stable, water-soluble CdTe quantum dots in sol-gel-derived composite silica spheres coated with calix [6]arene. 40 These NPs allowed the ultrasensitive detection of Hg 2þ ions, achieving a detection limit of 1.55 nM. The sensitivity of this method is quite good taking into account that the EPA sets the maximum level of mercury in drinking water at 10 nM (2 ppb).…”

Section: Quantum Dot As Passive Fluorescent Labelsmentioning

confidence: 99%

Analytical strategies based on quantum dots for heavy metal ions detection

Vázquez‐González

Carrillo‐Carrión

2014

J. Biomed. Opt

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Abstract. Heavy metal contamination is one of the major concerns to human health because these substances are toxic and retained by the ecological system. Therefore, in recent years, there has been a pressing need for fast and reliable methods for the analysis of heavy metal ions in environmental and biological samples. Quantum dots (QDs) have facilitated the development of sensitive sensors over the past decade, due to their unique photophysical properties, versatile surface chemistry and ligand binding ability, and the possibility of the encapsulation in different materials or attachment to different functional materials, while retaining their native luminescence property. This paper comments on different sensing strategies with QD for the most toxic heavy metal ions (i.e., cadmium, Cd 2þ ; mercury, Hg 2þ ; and lead, Pb 2þ ). Finally, the challenges and outlook for the QD-based sensors for heavy metals ions are discussed.

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“…Nowadays a wide range of QDs utilizations are found in the area of biology, biochemistry and biomedicine. Besides the applications as simple sensors, [75][76][77] the main function of QDs based on their exceptional fluorescent properties in the biochemical and biomedical research area is their usage as unique fluorescent labels. [78][79][80] The utilization of QDs for various purposes is shown in Figure 2.…”

Section: Qds As Alternative For Prion Detectionmentioning

confidence: 99%