, Volume 13, Issue 2, pp 537–544 | Cite as

Naked Eye Detection of Cr3+ and Co2+ Ions by Gold Nanoparticle Modified with Azomethine

  • Changiz Karami
  • Sara Yazdani Mehr
  • Esmail Deymehkar
  • Mohammad Ali Taher


This paper reports the synthesis of azomethine-modified gold nanoparticles with azomethine (azomethine-AuNPs) in aqueous media, which were characterized by FT-IR spectroscopy, ultraviolet–visible spectroscopy (UV-Vis), dynamic light scattering (DLS), thermogravimetric analysis (TGA), and transmission electron microscopy (TEM). The azomethine-AuNPs were employed as colorimetric for Cr3+ and Co2+ ions at pH 6.2–7.5 and 8.1–9.1, at room temperature in aqueous solution. In the presence of Cr3+ and Co2+, the azomethine-AuNPs induce aggregation of the nanoparticles. Upon aggregation, the surface plasmon absorption band red-shifts so that the nanoparticle solution appears a blue color. The sensitivity of azomethine-AuNPs towards other metal ions, Mg2+, Mn2+, Cr6+, Na+, Ni2+, Ag+, Al3+, Ca2+, Cd2+, Cu2+, Fe2+, Fe3+, Hg2+, Cd2+, K+, Co3+, Ni2+, Pb2+, and Zn2+ are negligible. This highly selective sensor allows a direct quantitative assay of Co2+ and Cr3+ with colorimetric detection limits of 83.22 and 108 nM, respectively.


Gold nanoparticle Sensors Nanoparticles Colorimetric sensing Co2+ and Cr3+ 



We are thankful to the Shahid Bahonar University of Kerman, Kerman, Iran, for supporting this work.


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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  • Changiz Karami
    • 1
  • Sara Yazdani Mehr
    • 2
  • Esmail Deymehkar
    • 1
  • Mohammad Ali Taher
    • 1
  1. 1.Department of Chemistry, Kermanshah BranchIslamic Azad UniversityKermanshahIran
  2. 2.Department of Chemistry, Faculty of SciencesShahid Bahonar University of KermanKermanIran

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