Ion-sensitive field-effect transistors with ultrathin Langmuir-Blodgett membranes
| Autor: | Michael J. Schöning, F. Kauffmann, B. Hoffmann, A. Steffen, Hans Lüth, Peter Kordos, R. Erbach, M. Sauke, Michel Marso |
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| Rok vydání: | 1995 |
| Předmět: |
Sodium
Metals and Alloys Analytical chemistry chemistry.chemical_element Electrolyte Condensed Matter Physics Langmuir–Blodgett film Surfaces Coatings and Films Electronic Optical and Magnetic Materials Ion selective electrode Ion Membrane chemistry Materials Chemistry Electrical and Electronic Engineering ISFET Thin film Instrumentation |
| Zdroj: | Sensors and Actuators B: Chemical. 27:325-328 |
| ISSN: | 0925-4005 |
| DOI: | 10.1016/0925-4005(94)01611-k |
| Popis: | Novel ISFET devices coated with ultrathin Langmuir-Blodgett (LB) membranes are suitable for sodium detection in liquids. Successful deposition of a Na + -ion sensitive LB film onto structured ISFET surfaces has been achieved. The LB material consists of a rod-like LB polymer mixed with a commercially available sodium ionophore. A thin additional LB covering layer increases the sensor stability in contact with the electrolytes. The ISFET sensors show a nearly Nernstian sodium sensitivity of more than 52 mV/pNa in the range 10 -3 to 1 mol/l over a period of at least 30 days. A maximum response time after concentration changes of less than 1 min was determined. Selectivities were investigated to interfering ions like K + , Ca 2+ , Mg 2+ and H + . The obtained results are in good agreement with the sensor properties of capacitive silicon/SiO 2 structures coated with LB membranes of the same kind. |
| Databáze: | OpenAIRE |
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