4.6 Article

N-1-(2-Mercaptoethyl)thymine modification of gold nanoparticles: a highly selective and sensitive colorimetric chemosensor for Hg2+

Journal

ANALYST
Volume 136, Issue 22, Pages 4770-4773

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/c1an15585g

Keywords

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Funding

  1. National Natural Science Foundation of China [20975089, 20975062]
  2. Chinese Academy of Sciences [KZCX2-EW-206]
  3. Department of Science and Technology of Shandong Province [2008GG20005005]

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An approach for mercury ions (Hg2+) sensing based on the Hg2+-induced aggregation of thymine (T)-SH-functionalized gold nanoparticles (AuNPs) has been reported. The T-SH ligands that we synthesized can easily be coupled to the surface of AuNPs through the Au-S bond and can recognize Hg2+ with high selectivity by forming a T-Hg-T complex with strong affinity. For the T-SH-functionalized AuNPs (T-S-AuNPs) sensor, upon addition of Hg2+, the formation of the T-Hg-T complex induces aggregation of T-S-AuNPs and results in a significant change of color and UV-Vis absorption spectra. Thus, our method can be used for the rapid, easy and reliable screening of Hg2+ in aqueous solution, with high sensitivity (2.8 nM) and selectivity over competing analytes. The developed method is successfully applied to the sensing of Hg2+ in real environmental samples.

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