Fabrication of color changeable indicating film for C 2H 4 by controlling the redox reaction of molybdate

Jin Ho Kim, Seimei Shiratori

Research output: Contribution to conferencePaperpeer-review


Color indicating film was fabricated by depositing SiO 2 nanoparticles on the filter paper absorbing the indicating solution synthesized with palladium sulfate and ammonium molybdate. The color of indicator film without SiO 2 was easily changed from white to blue in air because PdSO 4 remarkably accelerates the redox reaction of ammonium molybdate. In this study, we successfully diminished the color change of indicator in air by controlling the amount of SiO 2 on filter paper using a layer-by-layer self-assembly method. Finally, the color of indicating film prepared with (PDD A/SiO 2) 30 was white without color change in air. When this indicating film was exposed to C 2H 4 (50 - 150 ppm), the Hunter values (L, a, and b) were gradually decreased until 8 days and then maintained, which gave rise to the large total color difference of indicator from white to dark blue. Therefore this color indicator film will be a promising sensor for the system to preserve freshness during the storage of fruits or vegetables.

Original languageEnglish
Number of pages1
Publication statusPublished - 2005
Externally publishedYes
Event54th SPSJ Annual Meeting 2005 - Yokohama, Japan
Duration: 2005 May 252005 May 27


Other54th SPSJ Annual Meeting 2005


  • Color Changeable Film
  • Ethylene Gas
  • Layer-by-layer Self-assembly
  • Molybdate

ASJC Scopus subject areas

  • Engineering(all)


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