Dye nanoparticle or nanocomposite- coated test papers for detection at ppb levels of harmful ions

Research output: Chapter in Book/Report/Conference proceedingChapter

2 Citations (Scopus)


We have proposed a next-generation simple method for water analysis with high sensitivity to trace ions at ppb levels, named "dye nanoparticle-coated test strip" (DNTS). The DNTS is loaded with a thin layer (400 nm ~ 3 μm) of indicator dye nanoparticles or nanocomposites on the top surface of a membrane filter and provides a remarkably concentrated color signaling surface. Therefore, almost all signals are available efficiently, but in contrast to conventional test papers, indicator dyes are distributed over the entire support. The DNTS is applicable not only to immersion test but also to filtration enrichment in which target metal ions are concentrated by passing sample solutions through it. In addition, we designed two fabrication methods of DNTSs for the purpose of producing a large number of test strips with various organic indicator dyes. One method is ideal for hydrophobic indicators and is based on nanoparticle preparation by reprecipitation method. The other is suitable for hydrophilic dyes and is based on the preparation of nanocomposite composed of a water-soluble dye and nanoadsorbent through electrostatic interaction and the following aggregation. By simple filtration of the respective nano-dispersions with a fine membrane filter having microscopic pores, various kinds of DNTSs are available.

Original languageEnglish
Title of host publicationHandbook of Nanoparticles
PublisherSpringer International Publishing
Number of pages17
ISBN (Electronic)9783319153384
ISBN (Print)9783319153377
Publication statusPublished - 2015 Sep 18
Externally publishedYes


  • Dye nanocomposite
  • Dye nanoparticle
  • Dye nanoparticle coated test strip
  • Harmful ions
  • Ppb level
  • Water analysis

ASJC Scopus subject areas

  • Engineering(all)
  • Biochemistry, Genetics and Molecular Biology(all)

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