Koncki, Robert and Wolfbeis, Otto S. (1998) Composite films of Prussian Blue and N-substituted polypyrroles: Fabrication and application to optical determination of pH. ANALYTICAL CHEMISTRY, 70 (13). pp. 2544-2550. ISSN 0003-2700, 1520-6882
Full text not available from this repository.Abstract
A new and simple chemical method for deposition of thin blue films composed of Prussian Blue and N-substituted polypyrroles on nonconductive supports is presented. It is found that only pyrroles which are difficult to polymerize can be used for the preparation of such films. The resulting composite films were examined by SEM-EDAX, vis-NIR, and LR spectroscopy. The films are stable, thin, homogeneous, and optically transparent. The absorption maxima are at 720 nm, and spectral changes can be monitored using semiconductor light sources and detectors. The composite films are shown to be suitable for optical determination of pH over the pH 5-9 range because their absorbance strongly depends on pH in the physiological pH range, However, they undergo irreversible spectral changes if exposed to pH's >9. The films represent an alternative to indicator-based pH sensor materials because they do not require a dye to be immobilized. The pH measurements are highly reproducible, reversible in the physiological range, and not affected by ionic strength, alkaline cations, and typical oxidants and reductants.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ELECTROCHEMICAL PREPARATION METHOD; MODIFIED ELECTRODES; CONDUCTING POLYMER; DOPED POLYPYRROLE; ARRAY ELECTRODES; SENSORS; SPECTROELECTROCHEMISTRY; ELECTROCHROMISM; DEPOSITION; PRISTINE |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Analytische Chemie, Chemo- und Biosensorik |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 23 Feb 2023 11:29 |
| Last Modified: | 23 Feb 2023 11:29 |
| URI: | https://pred.uni-regensburg.de/id/eprint/49682 |
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