The metal island coated swelling polymer over mirror system (MICSPOMS): a new principle for measuring ionic strength
✍ Scribed by F.R. Aussenegg; H. Brunner; A. Leitner; Ch. Lobmaier; Th. Schalkhammer; F. Pittner
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 501 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0925-4005
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✦ Synopsis
We propose a new optical sensor principle for cases where the sensor/analyte reaction results in the change of non-spectroscopic parameters and demonstrate this for the ionic strength-dependent swelling of special polymers. The sensor material is part of an optical thin-film system which transforms the variation in volume into spectral information. The metal island coated swelling polymer over mirror system (MICSPOMS) is a special kind of optical reflection interference filter, consisting of a metal mirror, followed by a thin layer of an optical transparent interlayer, represented by the ionic strength sensitive polymer. Therefore, by monitoring the slope of the narrow bandwidth reflection minimum of this layer system a high sensitivity for the analyte, which causes the swelling, is obtained. To obtain swellability and attachment to the metal surface as well as photostructuring properties a crosslinked polyvinylpyrrolidone photopolymer was developed.