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Maziyar Marandi

Maziyar Marandi

Academic rank: Associate Professor
ORCID: https://orcid.org/0000-0002-4882-2033
Education: PhD.
ScopusId: 55650454400
Faculty: Science
Address: Arak University
Phone:

Research

Title
Cd+2‑sensing property of highly luminescent CdTe nanocrystals in the presence of Na2S2O3
Type
JournalPaper
Keywords
CdTe Nanocrystals, Cadmium, Na2S2O3, Fluorescent probe, Fluorescence enhancement
Year
2021
Journal Journal of Nanoparticle Research
DOI
Researchers Hakimeh Zare Bidaki ، Maziyar Marandi

Abstract

In this research, CdTe nanocrystals (NCs) of different sizes were synthesized through a chemical precipitation technique and used as the fluorescence probe of Cd ions in the fluorescence turn-on mode. Then, they were combined with various concentrations of Cd2+ ions as well as Na2S2O3 as a source of S. Na2S2O3 was applied to increase the sensing ability of the sensors in the range of 1 to 1000 μM. Different sizes of CdTe NCs from 1.3 to 3 nm and quantum yields from 11 to 19% were applied for the sensing. A sensitive and simple method was proposed for the detection of Cd ions. The morphology and the structure of the CdTe NCs were also investigated by transmission electron microscopy and X-ray diffraction analyses. Using Cd2+ ions and Na2S2O3 leads to the reduction of the surface trap states of the CdTe NCs. The fluorescence intensity of the CdTe NCs was thus increased with Cd2+ ions plus Na2S2O3, but the increase of fluorescence intensity did not occur in the samples without a source of S. Besides, smaller CdTe NCs proved to be more sensitive to Cd2+ in the solution. The reported method improves the possibilityof the selective determination of Cd2+, excluding the tangible influence of potential interfering ions such as Hg2+, Ca2+, Na+, K+, Cu2+, Co2+, Cr2+, and Mg2+. This method provides a simple tool to determine Cd ions in a wide range of Cd2+ concentrations.