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: Research - peer-reviewArticle

    • 29 Citations

    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
    Thin films
    Porphyrins
    Cyanides
    Ions
    Molecules
    Metalloporphyrins
    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: Research - peer-reviewArticle

    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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