Capacitive chemical sensor for detecting certain analytes,...

Details Capacitive chemical sensor for detecting certain analytes,... Capacitive chemical sensor for detecting certain analytes,...

G - Physics

01

R

324/23

G01R 27/26 (2006.01) G01N 27/22 (2006.01) G01N 33/18 (2006.01)

Patent

CA 1251516

ABSTRACT An apparatus for detecting the concentration of certain analytes, including hydrocarbons, in a liquid medium, is disclosed. The apparatus uses a planar or "open" capacitor containing an active layer. In response to selected analyte in the liquid medium, the active layer causes capacitance to decrease with increasing analyte concentration. The capacitance decreases because higher dielectric water molecules are displaced from a region of the capacitor's electric field. For certain hydrocarbon analytes having high Henry's Law constants, the active layer causes bubbles to nucleate in the liquid medium on the surface of the active layer. Bubble formation displaces water molecules and decreases capacitance.

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