de Marcos, Susana and Wolfbeis, Otto S. (1997) Characterization of polypyrrole films for use in optical sensing. SENSORS AND MATERIALS, 9 (4). pp. 253-265. ISSN 0914-4935
Full text not available from this repository.Abstract
A study has been performed on the properties of polypyrrole (PPy) as a new material for use in optical sensing. PPy was synthesized by chemical oxidation of pyrrole (Py) using various oxidizing agents including aqueous ferric chloride, and very homogeneous thin films were obtained on plastic supports such as polyester membranes and polystyrene slides after a reaction time of 25-30 min. Elemental analyses of PPy films are inconsistent with the chemical structure of a pure polypyrrole in that, in addition to the expected presence of C, H, N and Cl (for the chloride-doped forms), we find oxygen in typical fractions of 9.5%. We suggest a chemical structure of a hydroxylated PPy, which is consistent with these findings. PPy films were also analyzed by FTIR and SEM methods. The absorption spectra of PPy are characterized by a long-wavelength absorption band that extends far into the near infrared (NIR). The NIR spectra of PPy change with pH and on exposure to ammonia vapors, a fact that can be exploited for sensing purposes.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ELECTROCHEMICAL SENSORS; CHEMICAL POLYMERIZATION; INFRARED INVESTIGATIONS; CONDUCTING POLYMERS; COMPOSITE FILMS; PYRROLE; IONS; PRISTINE; polypyrrole; polypyrrole composition; polypyrrole chemical structure; optical spectra; optical sensors |
| 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: | 24 May 2023 09:59 |
| Last Modified: | 24 May 2023 09:59 |
| URI: | https://pred.uni-regensburg.de/id/eprint/51249 |
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