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Conductomectric microsensor

Student: Jiri Stehlik

Supervisor: Ing. Vladimir Kolarik, PhD.

   Requirements of an analytical chemistry are cheap and precise conductometric sensors with high sensibility even for very less quantity of a chemical solution. Miniaturisation brings many undesirable properties eg. an effect of double layer capacity, serial resistance of electrodes etc. A distance between electrodes is in the interval from 100um up to 10mm. The mesurements show that the conductivity depends on the intensity of the electric field which depends on distance of electrodes, on the interaction of double layer etc.
   An alternative thin-film conductometric sensor was designed and prototyped. Actually, it is ready for characterisation and further measurements.

Figures: A detail of meandric Molybdenum structure (top), a detail of microsensor structure (bottom).

EBL Lab ISI Brno Last change:12.6.2000 VK