CTAB-capped Mn-doped ZnS quantum dots and label-free aptamer for room-temperature phosphorescence detection of mercury ions

Analyst. 2012 Oct 21;137(20):4651-3. doi: 10.1039/c2an35777a.

Abstract

A new room-temperature phosphorescence (RTP) mercury ions sensor has been developed based on cetyltrimethylammonium bromide-capped Mn-doped ZnS quantum dots (CTAB/Mn-ZnS QDs) and label-free thymine (T)-rich aptamer. The formed T-Hg(2+)-T dsDNA can linearly quench the RTP of Mn-ZnS QDs through electron transfer and aggregation effect, and give a detection limit of 1.5 nM.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aptamers, Nucleotide / chemistry*
  • Cetrimonium
  • Cetrimonium Compounds / chemistry
  • DNA / chemistry
  • Ions / chemistry
  • Manganese / chemistry
  • Mercury / analysis*
  • Quantum Dots*
  • Spectrophotometry, Ultraviolet*
  • Sulfides / chemistry
  • Temperature
  • Thymine / chemistry
  • Zinc Compounds / chemistry

Substances

  • Aptamers, Nucleotide
  • Cetrimonium Compounds
  • Ions
  • Sulfides
  • Zinc Compounds
  • Manganese
  • DNA
  • Mercury
  • zinc sulfide
  • Thymine
  • Cetrimonium