Single standard calibration for an optical oxygen sensor based on luminescence quenching of a ruthenium complex

Martin M F CHOI*, Dan Xiao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)

Abstract

An optical oxygen (O2) sensor consisting tris(4,7-diphenyl-1,10- phenanthroline)ruthenium(II) ditetrakis(4-chlorophenyl)borate adsorbed on silica gel has been successfully fabricated and used to continuously monitor O2 gas at low concentration. The luminescence material shows a very strong and stable pink emission when excited by blue light and it is efficiently quenched by O2. The calibration of the optical sensor can be simply done by a single standard flow injection method. The results demonstrate excellent linear Stern-Volmer behaviour when O2 concentration is at low levels (0.0- 0.05% v/v), but the Stern-Volmer plot has a slightly downward curvature at higher O2 levels. The two-site quenching model correlates well with the calibrated O2 concentration range (0.0-0.55%). The t95 response times of the sensor are < 0.2 s on going from 0.0% to 0.55% O2 and < 1 s on going from 0.55% to 0.0% O2. The sensor has high photostability, a long lifetime and no hysteresis in the response.

Original languageEnglish
Pages (from-to)57-65
Number of pages9
JournalAnalytica Chimica Acta
Volume403
Issue number1-2
DOIs
Publication statusPublished - 3 Jan 2000

Scopus Subject Areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy

User-Defined Keywords

  • Optical sensor
  • Oxygen
  • Ruthenium(II) complex
  • Single standard calibration

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