Chemoresistive gas sensor

Details Chemoresistive gas sensor Chemoresistive gas sensor

1985-09-30

1987-06-23

Kreitman, Stephen A.

Measuring and testing

Gas analysis

Gas chromatography

338 34, 427102, G01N 2712

Patent

active

046743200

ABSTRACT:
A chemoresistive gas sensor is provided which has improved sensitivity. A layer of organic semiconductor is disposed between two electrodes which, in turn, are connected to a voltage source. High conductivity material is dispersed within the layer of organic semiconductor in the form of very small particles, or islands. The average interisland spacing is selected so that the predominant mode of current flow is by way of electron funneling. Adsorption of gaseous contaminant onto the layer of organic semiconductor modulates the tunneling current in a quantitative manner.

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B. Bott et al., "A Highly Sensitive NO.sub.2 Sensor Based on Electrical Conductivity Changes in Phthalocyamine Films", Sensors and Actuators, vol. 5, pp. 43-53, 1984.
E. Hermans, "CO, CO.sub.2, CH.sub.4 and H.sub.2 O Sensing by Polymer Covered Interdigitated Electrode Structures", Sensors and Actuators, vol. 5, pp. 181-186, 1984.

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