✦ LIBER ✦
Chemically modified field-effect transistors; a sodium ion selective sensor based on calix[4]arene receptor molecules
✍ Scribed by Jos A.J. Brunink; Jan R. Haak; Johan G. Bomer; David N. Reinhoudt; M.Anthony McKervey; Stephen J. Harris
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 515 KB
- Volume
- 254
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
The development of an ion-sensitive field-effect transistor for sodium ions is described, Calix[4]arene derivatives incorporated in a poly(viny1 chloride)-based membrane provide the selectivity. A poly(2-hydroxyethyl methacrylate) interlayer between the silicon dioxide gate and the sensing membrane is necessary to obtain a Na+-sensitive ISFET with Nemstian behaviour. The potentiometric selectivity coefficients (log Kfy') for Na+ over K+ and Li+ are -1.9 and -2.5, respectively.