Multi-coloration of Calixarene-coated Silver Nanoparticles for the Visual Discrimination of Metal Elements

Norioki Abe, Nobuhiko Iki

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Upon mixing with metal ions such as CdII, TbIII, CuII, NiII, PbII, ZnII, and CoII at pH 10.0, solutions of silver nanoparticles (AgNPs) coated with calix[4]arene-p-tetrasulfonate (CAS-AgNP) exhibited multi-coloration from yellow to orange, violet, and green, depending on the metal elements present, which allowed for visual discrimination of the ions. This is contrary to the AgNP sensors exhibiting a uniform color change from yellow to red upon binding of a receptor molecules at the surface of AgNPs to an analyte. The TEM images of the samples obtained from the resultant solution showed two regions. First, a region where CAS-AgNPs assembled on the surface of the metal hydroxides. The size of the hydroxide crystals varied from 50 to 200 nm with the type of metal element present, and roughly correlated with the extinction band of the aggregated AgNPs. Second, the amorphous region in which CAS-AgNPs dispersed randomly. The difference in the amount of the crystal region and the area seemed to lead to the multi-coloration.

Original languageEnglish
Pages (from-to)1141-1145
Number of pages5
JournalAnalytical sciences : the international journal of the Japan Society for Analytical Chemistry
Issue number10
Publication statusPublished - 2017
Externally publishedYes


  • Silver nanoparticles
  • calixarene
  • metal ions
  • visual detection

ASJC Scopus subject areas

  • Analytical Chemistry


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