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Ionsensitive Field-Effect-Structures with Langmuir-Blodgett Membranes
Erbach, R. Vogel, A. Hoffmann, B.
Erbach, R.
Vogel, A.
Hoffmann, B.
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Issue Date
1992
Submitted date
2024-05-08
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Abstract
The electrolyte/insulator/silicon-structure is well suited to investigate and to optimize membranes for an application in ion-sensitive-field-effect-transistors (ISFETs). Examples for new membrane materials for chemical sensors are offered by special Langmuir-Blodgett (LB) films, which show very good properties with respect to long-term stability and sensitivity. An indispensable condition for the use of the insulator as a carrier for different sorts of chemically sensitive groupsis its protection against water. Membranes made of a synthetic rodlike Phthalocyaninato-Polysiloxane (PcPS)-Polymeror a special Polyglutamate (PG) fulfill this demand. They both exhibit lifetimes of more than 6 months in permanent contact with electrolyte. While the PcPS-membranes show a pH-sensitivity depending ontheir thickness, the PG membranes show a much reduced pH-sensitivity. The latter can thus be used for a reference-element. There are two waysto obtain ion-sensitive LB-materials: Covalent fixing of ionophores like crown ethers or physical mixing of special sensitive groups to the polymers. In this paper an Ag*-sensitive membrane with fixed olefin-groups and a K*- sensitive membrane with a mixed film of PG and Valinomycin are presented.
Citation
Biosensors : fundamentals, technologies and applications, 353 - 357
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Book chapter
conference paper
conference paper
Language
en
Description
Series/Report no.
GBF monographs ; Volume 17
ISSN
0930-4320
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ISBN
1560812206
3527284370
3527284370
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Attribution-NonCommercial-ShareAlike 4.0 International