Evanescent sensing in doped sol-gel glass films

John E. Lee, S. Scott Saavedra

Research output: Contribution to journalArticle

82 Scopus citations

Abstract

Bromophenol blue, a pH indicator, was entrapped in porous glass films prepared by the sol-gel method. The colorimetric response of the films to pH was assessed visibly and by attenuated total reflectance spectrometry. The entrapped indicator was nonleachable and responded to solution pH changes in a reversible manner. The immobilization of indicator molecules in porous sol-gel films appears to be a particulary promising approach to optical waveguide sensor development.

Original languageEnglish (US)
Pages (from-to)265-269
Number of pages5
JournalAnalytica Chimica Acta
Volume285
Issue number3
DOIs
StatePublished - Jan 28 1994

Keywords

  • Attenuated total reflectance
  • Bromophenol blue
  • Colorimetry
  • Indicators
  • Porous glass films
  • Sol-gel method

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy

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