4.5 Article

The reactivity study of peptide A3-capped gold and silver nanoparticles with heavy metal ions

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.mseb.2016.04.001

Keywords

Peptide A3; Nanoparticle; Aggregation; Reaction; Heavy metal ions

Funding

  1. National Recruitment of Global Experts
  2. National Natural Science Foundation of China (NSFC) [21528301]
  3. Fundamental Research Funds for Central Universities (SCUT) [2015ZM012, 2015PT026]
  4. Guangdong Natural Science Funds for Distinguished Young Scholars [2015A030306006]
  5. Project of Public Interest Research
  6. Capacity Building of Guangdong Province [2015A010105009]

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Peptide A3-capped gold and silver nanoparticles were prepared by chemical reduction of metal salt precursors. The nanoparticles exhibited apparent but distinctly different color changes upon the addition of selected heavy metal ions. For gold nanoparticles, the solution color was found to change from red to blue in the presence of Hg2+ or As3+ ions, accompanied with broadening and a red-shift of the surface plasmon resonance peak. In contrast, silver nanoparticles showed an apparent color change from to colorless only in the presence of Hg2+, along with a blue-shift and diminishment of the surface plasmon resonance peak. The Hg2+ reaction concentration limit of silver nanoparticle was about 40 times lower than that of gold nanoparticle. Based on the dynamic light scattering, transmission electron microscopy and X-ray photoelectron spectroscopic results, the reaction mechanism has been proposed. Such a sensitive variation of the nanoparticle optical properties to selective ions might be exploited for ion detection for potential applications. (C) 2016 Elsevier B.V. All rights reserved.

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