Robust chemiresistor sensor

Details Robust chemiresistor sensor Robust chemiresistor sensor

2006-09-26

2006-09-26

Warden, Jill (Department: 1743)

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Means for analyzing gas sample

C422S050000, C422S051000, C422S051000, C422S051000, C422S068100, C422S069000, C422S082010, C422S082020, C422S082030, C422S082040, C422S088000, C422S097000, C422S098000, C073S001010, C073S001020, C073S023200, C073S053010, C438S014000, C438S017000, C438S048000, C438S049000, C029S025010, C029S592000, C029S592100

Reexamination Certificate

active

07112304

ABSTRACT:
A chemiresistor sensor probe for detecting 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.

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Communication from European Patent Office dated Nov. 10, 2004.
Eastman et al., “Application of the Solubility Parameter Concept to the Design of Chemiresistor Arrays”, Journal of the Electrochemical Society, Jan. 20, 1999, pp. 3907-3913.

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