| 摘要 |
A chemiresistor sensor probe (12) for detecting target analytes. The probe (12) includes a body (20) having a first control surface (36) and a second control surface (38) recessed within the first. A sensor film (22) comprises numerous conductive particles (54) disposed upon the second surface (38). The film (22) swells upon absorbing one or more analytes for which it has an affinity, thus causing the conductive particles (54) to become more dispersed and increasing the resistance between the particles. The thickness (A) of the film (22) 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 (36,38). The robustness of the sensor probe (12) is enhanced by placing a porous or mesh electrode (58) along with, or in place of, a chemical binding agent between the film (22) and the terminals (24). The robustness is also improved by placing a diode in series with the sensor circuit. <IMAGE> |
