Preparation, characterization and cell cytotoxicity of Pd-doped CdTe quantum dots and its application as a sensitive fluorescent nanoprobe

摘要

Dopants strongly affect properties and optical behaviors of quantum dots, therefore doped-QDs considered as a novel class of luminescent materials. Following development doping approach and using Pd2+ ions as a dopant, for the first time, in this study, a facile preparation of Pd-doped CdTe QDs was reported with thioglycolic acid as a stabilizer. The essential parameters of the synthesis conditions such as dopant concentration, reaction time and optical properties of the Pd: CdTe QDs was studied. The Pd: CdTe QDs with excellent photostability and biocompatibility, exhibited a greenish emission at 529 nm. Interestingly, these nanoparticles display high fluorescence sensitivity to diazinon (DZN). Under optimal conditions, a proposed sensor was designed based on Pd: CdTe QDs which represented a wide range of linear response (2.3-100 mu M), low detection limit [3.3 nM, (S/N = 3)], high stability, and selectivity. Additionally, the newly sensing nanoprobe was used for the determination of DZN in environmental water samples with satisfactory results.