Turn-on electrochemiluminescence sensing of Cd(2+) based on CdTe quantum dots

Spectrochim Acta A Mol Biomol Spectrosc. 2014 Dec 10:133:130-3. doi: 10.1016/j.saa.2014.05.053. Epub 2014 May 28.

Abstract

A simple and sensitive method for the detection of cadmium ion was proposed based on the electrochemiluminescence (ECL) of thioglycolic acid capped-CdTe quantum dots (CdTe QDs). The ECL of CdTe QDs was firstly quenched by introduction of S(2)(-) and was restored due to following addition of Cd(2+), on the basis of which, a "turn-on" ECL method for the detection of Cd(2+) was demonstrated. The ECL of CdTe QDs exhibited linear response toward Cd(2+) concentration in the range from 6.3nM to 3.4μM (R=0.999) with a detection limit of 2.1nM. The proposed assay was simple, sensitive, selective, and practicable in real water samples.

Keywords: Cd(2+); Electrochemiluminescence; Quantum dots; Turn-on.

Publication types

  • Evaluation Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cadmium / analysis*
  • Cadmium Compounds / chemistry*
  • Electrochemical Techniques / methods
  • Limit of Detection
  • Luminescent Measurements / methods*
  • Quantum Dots / chemistry*
  • Tellurium / chemistry*
  • Water / analysis*

Substances

  • Cadmium Compounds
  • Cadmium
  • Water
  • Tellurium
  • cadmium telluride