Diethyldithiocarbamate functionalized CdSe/CdS quantum dots as a fluorescent probe for copper ion detection

Wang, Jiazi; Zhou, Xiaopan; Ma, Haile; Tao, Guanhong

doi:10.1016/j.saa.2011.05.098

Cited by 57 publications

(24 citation statements)

References 42 publications

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“…This was driven by the difference in relative electronegativities of metallic elements, bond energies of metal-sulfur, formation energies of the sulfide compounds, as well as the difference in solubility of the sulfide compounds [55]. Another mechanism of the quenching of modified QDs by heavy metal ions may be due to the coordination of heavy metal ions with the capping material at the surface of QDs, resulting in the electron transfer from excited functionalized QDs to heavy metal ions [56].…”

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

confidence: 99%

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

confidence: 99%

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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“…New fluorescence sensor for determination of Cu(II) based on the quenching effect of the DDTC -functionalized quantum dots (QDs) was reported 68 . The DDTC was bonded the quantum dots via the surface ligand exchange to from DDTC-QDs conjugates following the capping of 2-mercaptoacetic acid on core shall CdSe/Cds QDs.…”

Section: Functional Ligandsmentioning

confidence: 99%

Diethyldithiocarbamate Doped Graphene Quantum Dots Based Metal Complex Nanoparticles by Resonance Light Scattering for Green Detection of Lead (II) – A Review

Kaewprom¹,

Nuengmatcha²,

Chanthai³

2018

Orient. J. Chem

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Resonance light scattering (RLS) probe for sensitive determination of heavy metals such as lead (Pb) based on diethyldithiocarbamate (DDTC) doped graphene quantum dots (GQDs) is subject to approach on green procedure of metal complex nanoparticles. Regarding Pb(II), the RLS intensity of GQDs-DDTC increases linearly by an enhancement mechanism. Interactions between target analyte and the ligand doped nanoparticles lead to an aggregation of the complex particles to form bigger volume of the metal complex. Thus, it can be used as the RLS probe for such determination of lead ion at ultra-trace level, certainly under the optimum conditions; such experimental parameters including each of DDTC and GQDs concentration, pH of solution, ionic strength, masking agent, and interfering ions are investigated in details. The methods can then be implied for selective determination of some relevant toxic heavy metals in water, foods or environment samples.

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“…21 "Off-and-on" uorescent probes are generally composed of many kinds of QDs and have attracted great attention because of their sensitive response to some trace ions and molecules. For example, diethyldithiocarbamate-functionalized CdSe/CdS QDs have been used as a uorescent probe for copper ion detection, 22 manganese oxide QDs have been applied as a uorescent probe for the detection of metal ions in aqueous media, 23 and carbon dots have been used as uorescent probes for "off-on" detection of Cu 2+ and L-cysteine in aqueous solutions. 24 However, agglomeration of these QDs can easily occur during their preparation and preservation as well as application because of their high surface energies, making them unstable.…”

Section: Introductionmentioning

confidence: 99%

Novel rod-Y₂O₃:Eu³⁺@0.01YVO₄:Eu³⁺ with open core/shell nanostructure and “off-and-on” fluorescent performance

et al. 2017

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Diethyldithiocarbamate functionalized CdSe/CdS quantum dots as a fluorescent probe for copper ion detection

Cited by 57 publications

References 42 publications

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

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

Diethyldithiocarbamate Doped Graphene Quantum Dots Based Metal Complex Nanoparticles by Resonance Light Scattering for Green Detection of Lead (II) – A Review

Novel rod-Y₂O₃:Eu³⁺@0.01YVO₄:Eu³⁺ with open core/shell nanostructure and “off-and-on” fluorescent performance

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Diethyldithiocarbamate functionalized CdSe/CdS quantum dots as a fluorescent probe for copper ion detection

Cited by 57 publications

References 42 publications

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

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

Diethyldithiocarbamate Doped Graphene Quantum Dots Based Metal Complex Nanoparticles by Resonance Light Scattering for Green Detection of Lead (II) – A Review

Novel rod-Y2O3:Eu3+@0.01YVO4:Eu3+ with open core/shell nanostructure and “off-and-on” fluorescent performance

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Novel rod-Y₂O₃:Eu³⁺@0.01YVO₄:Eu³⁺ with open core/shell nanostructure and “off-and-on” fluorescent performance