Robust chemiresistor sensor

G - Physics – 01 – N

Patent

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Details

G01N 27/04 (2006.01) G01N 27/12 (2006.01)

Patent

CA 2464041

A chemiresistor sensor probe for defecting target analytes. The probe includes a body having a first control surface and a second control surface recessed within the first. A sensor film comprises numerous conductive particles disposed upon the second surface. The film swells upon absorbing one or more analytes for which it has an affinity, thus causing the conductive particles to become more dispersed and increasing the resistance between the particles, The thickness of the film is equal to the distance between the first surface and the second surface, thus permitting the thickness to be controlled by varying the distance between the control surfaces. The robustness of the sensor probe is enhanced by placing a porous or mesh electrode along with, or in place of, a chemical binding agent between the film and the terminals. The robustness is also improved by placing a diode in series with the sensor circuit.

Sonde de détection à chimiorésistance pour déceler les analytes cibles. La sonde comprend un corps doté d'une première surface de commande et d'une seconde surface de commande logée dans la première. Un film de détection, qui comprend de nombreuses particules conductrices placées sur la seconde surface, gonfle à l'absorption d'au moins un analyte avec lequel il a une affinité, entraînant la dispersion des particules conductrices tout en accroissant la résistance entre les particules. L'épaisseur du film est égale à la distance entre la première surface et la seconde surface. Ainsi, l'épaisseur peut être réglée en variant la distance entre les surfaces de commande. La robustesse de la sonde de détection est accentuée par le placement d'une électrode poreuse ou d'une électrode à mailles, en plus d'un agent de liaison chimique ou à la place de celui-ci, entre le film et les bornes. La robustesse est également améliorée en plaçant une diode en série avec le circuit de capteur.

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