Mercaptopropionic acid capped CdSe/ZnS quantum dots as fluorescence probe for lead(II)

Luan, Weiling; Yang, Hongwei; Wan, Zhen; Yuan, Binxia; Yu, Xinhai; Tu, Shan‐Tung

doi:10.1007/s11051-012-0762-3

Cited by 41 publications

(28 citation statements)

References 24 publications

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“…Furthermore, the emission bandwidth was not significantly narrowed. The broad FWHM and blue-shift properties of CIS/ZnS PL emission were different from the reported narrow FWHM and red-shift properties of CdSe and CdS QDs because of excitonic emissions [9,48,49].…”

Section: Shell Synthesiscontrasting

confidence: 91%

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Optimization of the recipe for the synthesis of CuInS₂/ZnS nanocrystals supported by mechanistic considerations

Luan

et al. 2016

Green Processing and Synthesis

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CuInS 2 /ZnS (CIS/ZnS) quantum dots (QDs) with high photoluminescence (PL) were synthesized via a facile solvothermal approach. Gaussian deconvolution of PL spectra, transmission electron microscopy, and timeresolved PL spectroscopies were used to characterize the emission properties of the prepared CIS and CIS/ZnS QDs. It was found that the growth of ZnS can reduce the surface defect acting as traps to minimize donor-acceptor emissions, and the contribution of band to donor/acceptor transition becomes a dominating emission with the increase of shell growth time. The blue shift of PL emission wavelength of CIS/ZnS QDs underwent two steps: the dramatic blue shift originated from the decreased fraction donor-acceptor transition due to the reduction of surface defects at the beginning and the subsequently mild blueshift with the time from the interdiffusion of CIS and ZnS. The effect of trioctylphosphine (TOP) and dodecanethiol (DDT) as ligands during shell growth on the optical properties of QDs were investigated and compared. The PL quantum yield (QY) of CIS core affects the final value of CIS/ ZnS QDs, and the higher PL QY is achieved while using CIS core with higher PL QY. Based on the selected ligand DDT, the reaction parameters, such as CIS core reaction time, shell growth time, and Zn/Cu feed molar ratio, were further optimized. CIS/ZnS QDs with high PL QY can be obtained with a Zn/Cu feed molar ratio larger than 4, shell growth time of 30 to 90 min, and shell growth temperature 220°C-240°C, and the maximum value was up to about 80% by adjusting the above-mentioned parameters.

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Section: Shell Synthesiscontrasting

confidence: 91%

“…They have promising applications in solar cells [2][3][4], heat electrical application [5], light-emitting diodes (LED) [6,7], sensors [8], fluorescent probes [9,10], biolabeling [11], anticounterfeiting [12], etc. However, the intrinsic toxicity of QDs containing heavy metals (e.g.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the recipe for the synthesis of CuInS₂/ZnS nanocrystals supported by mechanistic considerations

Luan

et al. 2016

Green Processing and Synthesis

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“…One of QDs' applications in biosensing methods is fluorescence quenching. As already reported, in aqueous solutions, the fluorescence intensity of QDs could be effectively quenched by heavy metal ions like Pb 2+ [27], Cu 2+ [28][29][30], or free radicals [31,32]. Our preliminary tests indicated that several components or contaminants contained in used oils, such as heavy metal ions, free radicals, electron withdrawing groups, and conjugated carbon-carbon double bonds, could also quench the fluorescence of QDs.…”

Section: Introductionsupporting

confidence: 77%

“…The interdigitated bilayer structure of CTAB-TOPO-coated CdSe/ZnS QD, whose first layer was original surface ligands TOPO and the second layer was CTAB, made it a more sensitive and selective fluorescence probe than CdSe/ZnS QD to the quenchers [46]. Similar organic coated bilayer structures of water-soluble CdSe/ZnS QDs were also investigated by others as fluorescence quenching probes for selective detection and quantification of analytes like chloride anion [47], hypochlorite [48], heavy metal ions [27][28][29][30]49], nitroaromatic [50] and even chiral mixtures of enantiomers [51,52].…”

Section: Comparison Of Oil-soluble Qds and Water-soluble Ctab-coated Qdsmentioning

confidence: 99%

“…Used oils that had contacted with metal ware when they were heated for frying food and held for storage and transportation, were severely contaminated by heavy metal ions, such as Pb 2+ , Cr 6+ , Cu 2+ , Mn 2+ , Zn 2+ , Ni 2+ [54]. The Pb 2+ [27] and Cu 2+ [28][29][30] were demonstrated to decrease the fluorescence intensity of functional ligands capped CdSe/ZnS QDs. One mechanism of the fluorescence quenching of surface modified inorganic CdSe/ZnS QDs was the cation exchange of Zn with the quenching heavy metals.…”

Section: Comparison Of Oil-soluble Qds and Water-soluble Ctab-coated Qdsmentioning

confidence: 99%

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Rapid detection of vegetable cooking oils adulterated with inedible used oil using fluorescence quenching method with aqueous CTAB-coated quantum dots

Xiong

et al. 2014

Sensors and Actuators B: Chemical

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a b s t r a c tVegetable cooking oils adulterated with inedible used oils or impure oils have posed a severe food safety problem. Current detection methods cannot meet the needs for rapid detection of adulterated oils on line or in field. Therefore, the objective of this research was to develop a rapid optical sensing method based on fluorescence quenching of CdSe/ZnS quantum dots (QDs) for identification of adulterated vegetable cooking oils. High quality hydrophilic photoluminescent nanoparticles were synthesized by encapsulating hydrophobic QDs into the micellar structure of an amphiphilic surfactant cetyltrimethyl ammonium bromide (CTAB) via phase transfer method. TEM, AFM, and fluorescence spectroscopy were used to characterize the prepared CTAB-coated QDs. Oil samples were first captured into the core of the twolayer-structural micelle and then the fluorescence of CTAB-coated QDs, working as fluorescence probes, was selectively quenched by components of the adulterated oils. Heavy metal ions and free radicals were presumed to be main quenchers. After quenching for 1 min, fluorescence intensity was measured and converted to quenching percentage to determine the adulteration concentration. The results showed that in comparison with oil-soluble QDs, water-soluble CTAB-coated QDs had a greater ability to identify oil adulteration. A good quantitative relationship between quenching percentage and adulteration concentration (y = 5.96x + 14.99; R 2 = 0.94) was obtained. The sensitive, simple and low-cost sensing method did not require sample pretreatment and could detect refined used oils at 0.4% or higher concentrations in soybean oil within 2 min, showing great potentials for rapid screening of used oils and quantitative analysis of used oil adulteration in field.

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Release of Warfarin from Human Serum Albumin by Water‐soluble CdSe Nanotetrapods

et al. 2020

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Water soluble CdSe nanotetrapods are prepared by ligand exchange from organic‐soluble ones. In order to achieve this, oleic acid, which is the capping agent for as prepared water‐insoluble nanotetrapods, is exchanged with mercaptopropanoic acid (MPA). Shape and size of nanotetrapods are conserved upon ligand exchange. Ground state bleach recovery dynamics remain the same as well. However, they are completely non‐emissive. These water‐soluble nanotetrapods disrupt the secondary structure of Human Serum Albumin (HSA) and consequently, release warfarin bound to the protein.

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Mercaptopropionic acid capped CdSe/ZnS quantum dots as fluorescence probe for lead(II)

Cited by 41 publications

References 24 publications

Optimization of the recipe for the synthesis of CuInS₂/ZnS nanocrystals supported by mechanistic considerations

Optimization of the recipe for the synthesis of CuInS₂/ZnS nanocrystals supported by mechanistic considerations

Rapid detection of vegetable cooking oils adulterated with inedible used oil using fluorescence quenching method with aqueous CTAB-coated quantum dots

Release of Warfarin from Human Serum Albumin by Water‐soluble CdSe Nanotetrapods

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Mercaptopropionic acid capped CdSe/ZnS quantum dots as fluorescence probe for lead(II)

Cited by 41 publications

References 24 publications

Optimization of the recipe for the synthesis of CuInS2/ZnS nanocrystals supported by mechanistic considerations

Optimization of the recipe for the synthesis of CuInS2/ZnS nanocrystals supported by mechanistic considerations

Rapid detection of vegetable cooking oils adulterated with inedible used oil using fluorescence quenching method with aqueous CTAB-coated quantum dots

Release of Warfarin from Human Serum Albumin by Water‐soluble CdSe Nanotetrapods

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Optimization of the recipe for the synthesis of CuInS₂/ZnS nanocrystals supported by mechanistic considerations

Optimization of the recipe for the synthesis of CuInS₂/ZnS nanocrystals supported by mechanistic considerations