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Colorimetric Sensing of Silver(I) and Mercury(II) Ions Based on an Assembly of Tween 20-Stabilized Gold Nanoparticles

Lin, Cheng-Yan, Yu, Cheng-Ju, Lin, Yen-Hsiu, Tseng, Wei-Lung·2010·Analytical Chemistry
DOI 10.1021/ac1007909
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Abstract

We have developed a rapid and homogeneous method for the highly selective detection of Hg(2+) and Ag(+) using Tween 20-modified gold nanoparticles (AuNPs). Citrate ions were found to still be adsorbed on the Au surface when citrate-capped AuNPs were modified with Tween 20, which stabilizes the citrate-capped AuNPs against conditions of high ionic strength. When citrate ions had reduced Hg(2+) and Ag(+) to form Hg-Au alloys and Ag on the surface of the AuNPs, Tween 20 was removed from the NP surface. As a result, the AuNPs were unstable under a high-ionic-strength solution, resulting in NP aggregation. The formation of Hg-Au alloys or Ag on the surface of the AuNPs was demonstrated by means of inductively coupled plasma mass spectroscopy and energy-dispersive X-ray spectroscopy. Tween 20-AuNPs could selectively detect Hg(2+) and Ag(+) at concentrations as low as 0.1 and 0.1 microM in the presence of NaCl and EDTA, respectively. Moreover, the probe enables the analysis of AgNPs with a minimum detectable concentration that corresponds to 1 pM. This probe was successfully applied to detect Hg(2+) in drinking water and seawater, Ag(+) in drinking water, and AgNPs in drinking water.

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Cited by

Metadata

Authors
Lin, C.-Y., Yu, C.-J., Lin, Y.-H., & Tseng, W.-L.
Venue
Analytical Chemistry
Publisher
American Chemical Society (ACS)
Published
2010-07-16
Volume
82
Issue
16
Pages
6830-6837
ISSN
  • 0003-2700 (ISSN-L)
  • 1520-6882
DOI
10.1021/ac1007909
OpenAlex
W2077021162
Cited by
410
References
0
FWCI
13.88
Type
journal article
Language
en
Open access
closed

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