Sol-gel derived titanium carboxylate thin films for optical detection of analytes

Dilum D. Dunuwila, B. A. Torgerson, C. K. Chang, Kris A. Berglund

Research output: Contribution to journalArticle

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Abstract

The feasibility of using a sol-gel derived titanium carboxylate thin film, which can be supported on glass, for the fabrication of optical test strips was investigated using a model probe/ analyte combination. The porous films, being optically transparent and baring the capability to host probe molecules, provided an excellent system to investigate the possibility of making optical test strips. A colorimetric reagent, an iron(III) porpohyrin, was chosen as the probe molecule to detect free cyanide ion concentrations in aqueous solutions. Entrapment of the porphyrin in the film was accomplished by direct dissolution of the porphyrin in the sol-gel solutions. Chemically induced structural modifications of the polymer were carried out to stabilize the encapsulated metalloporphyrin within the sol-gel derived matrix. The syntheses of this model analyte detection system and its response are presented. An optical parameter reflective of the chemical changes that occur in the system was selected as the measurement tool; its response asymptotically increased over the cyanide ion concentration range of 40-25 000 ppm.

LanguageEnglish (US)
Pages2739-2744
Number of pages6
JournalAnalytical Chemistry
Volume66
Issue number17
StatePublished - Sep 1 1994

Profile

Titanium
Sol-gels
Porphyrins
Cyanides
Thin films
Metalloporphyrins
Ions
Molecules
Polymers
Dissolution
Iron
Fabrication
Glass

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

Sol-gel derived titanium carboxylate thin films for optical detection of analytes. / Dunuwila, Dilum D.; Torgerson, B. A.; Chang, C. K.; Berglund, Kris A.

In: Analytical Chemistry, Vol. 66, No. 17, 01.09.1994, p. 2739-2744.

Research output: Contribution to journalArticle

Dunuwila, DD, Torgerson, BA, Chang, CK & Berglund, KA 1994, 'Sol-gel derived titanium carboxylate thin films for optical detection of analytes' Analytical Chemistry, vol 66, no. 17, pp. 2739-2744.
Dunuwila, Dilum D. ; Torgerson, B. A. ; Chang, C. K. ; Berglund, Kris A./ Sol-gel derived titanium carboxylate thin films for optical detection of analytes. In: Analytical Chemistry. 1994 ; Vol. 66, No. 17. pp. 2739-2744
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