Ultrasensitive mercury(II) ion detection by europium(III)-doped cadmium sulfide composite nanoparticles

Structural phase transition and photoluminescence properties of wurtzite CdS:Eu3+ nanoparticles under high pressure

“…24,25 For example, the uorescence intensity of Eu 3+ doped CdS NPs reduced obviously in the presence of the Hg 2+ ions, which makes it as a uorescence probe for the Hg 2+ detection. 26 However, the luminescent properties of europium are inuenced by a number of factors such as the site symmetry, quantum dots, surfactants, morphology and crystal defect, phenomena like antenna effect and physical parameters like temperature. 27 It is still debated whether or not lanthanide ions are really incorporated into the host lattice (ZnS or CdS) sites as the luminescence from lanthanide dopants in QDs also depends on their location in the host lattice.…”

Recent developments on nanomaterials-based optical sensors for Hg2+ detection

“…Nowadays, different Cd-chalcogenide QDs (CdS, CdSe, CdTe) coated with thiol-containing organic molecules such as L-cysteine (L-Cys), mercaptoacetic acid (MAA), mercaptopronionic acid (MPA), denatured bovine serum albumin (dBSA), cysteamine (CA) and thioglycolic acid (TGA) were synthesized and used as fluorescent probes to detect Hg 2+ [67][68][69][70][71][72]. Besides the commonly used Cd-chalcogenide QDs, their derivatives such as MAA-capped CdS/ ZnS core-shell QDs and QDs doped with rare earth ions (CdS:Eu QDs and CdS:Tb QDs capped with glutathione (GSH)) were also utilized for Hg 2+ analysis [73][74][75]. The above mentioned sensing systems were all based on the fluorescence quenching of QDs by Hg 2+ .…”

Analytical strategies based on quantum dots for heavy metal ions detection

“…Two efficient FRET systems have been developed for the ultrasensitive detection of Hg 2þ ions by using lanthanide-doped CdS QDs. 44,45 These composite nanoparticles, terbium(III)-doped CdS 44 and europium (III)-doped CdS, 45 were successfully synthesized through a straightforward one-pot process with GHS as capping ligand. In both cases, CdS nanoparticles act as energy donors whereas the lanthanide ions, Tb 3þ or Eu 3þ , are the energy acceptors.…”