Fiber optic sensing of cyanides in solutions

S. S. Park, J. D. Mackenzie, C. Y. Li, P. Guerreiro, N. Peyghambarian

Research output: Contribution to journalConference articlepeer-review


A novel sol-gel technique was used to immobilize malachite green ions (MG+) in stable, optically transparent, porous silica gel films. A simple and sensitive method was developed for the detection of cyanides in solutions using spectrophotometry to measure changes caused by cyanide ions (CN-) in the absorption spectra of the green-colored silica gel films. After reaction with cyanide ions, the absorption spectra of the films changed with a typical decrease in absorbance at 620 nm. On the basis of the absorption spectra of the films, a portable and easy to use fiber optic cyanide film sensor was fabricated. Decolorization undergone by the green-colored gel films, as they were exposed to cyanide ions, was detected through a fiber. Preliminary results indicate concentrations on the order of a few ppm are detected using the fiber optic sensor.

Original languageEnglish (US)
Pages (from-to)667-672
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
StatePublished - 1996
EventProceedings of the 1996 MRS Spring Symposium - San Francisco, CA, USA
Duration: Apr 8 1996Apr 12 1996

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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