Glutathione-modified ultrasmall Ce3+and Tb3+-doped SrF2 nanocrystals for fluorescent determination of Hg(II) and Pb(II) ions

Manjunath Chatti, Shyam Sarkar, Venkataramanan Mahalingam

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9 Citations (Scopus)

Abstract

We report on the microwave-assisted synthesis of ultrasmall Ce3+ and Tb3+-doped SrF2 nanocrystals (NCs) capped with glutathione (GSH). The NCs have an average size of about 5 nm and show bright green fluorescence upon photoexcitation at 290 nm. Fluorescence is strongly quenched by Hg(II) and Pb(II). This finding was applied to design a method for the fairly selective determination of these ions. The detection limits (for the 3σ/slope criterion) are 20 μM and 30 μM for Hg(II) and Pb(II) ions, respectively. The intensity of the luminescence can be restored by the addition of ethylenediaminetetraacetic acid (EDTA), and this suggests that these NCs can be used as reusable fluorescent probes. [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)133-140
Number of pages8
JournalMicrochimica Acta
Volume183
Issue number1
DOIs
Publication statusPublished - 1 Jan 2016
Externally publishedYes

Keywords

  • Cerium
  • Detection and heavy metal ions
  • Lead
  • Luminescence
  • Mercury
  • Nanocrystals
  • Quenching
  • Terbium

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