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Polypyrrole (PPy) is one of the important conductive polymer (CP) that is widely used in gas sensing applications. It exhibits reversible changes in its direct current (DC) resistance on exposure to variety of organic vapors and gases, but the environmental stability of its resistive property is found poor. Hence polypyrrole based gas sensor is designed and its electrical properties against ethanol...
We fabricated a gas sensor for the detection of a carbon monoxide (CO) and ammonia (NH3) gas using single walled carbon nano tubes (SWNTs) and polyaniline(PANI) composite. The SWNTs were dispersed in sodium dodecyl sulfate (SDS) and were applied over the electrodes of an interdigitated electrodes (DDEs) by photolithography. By using this method, the active area for gas sensing can be defined more...
Effect of thiol to the sensing characteristics of gas sensors based on carbon nanotubes(CNTs) were studied. Sensors were divided into three groups: pure CNTs coated on Au electrode; thiol-CNTs coated on Au electrode; pure CNTs coated on Au electrodes modified with alkanethiol self-assembled monolayers(SAMs). When exposed to formaldehyde of different concentration at room temperature, obvious differences...
The early developments of an optical gas sensor combining plasma ignition by silicon electrode arrays and optical detection coupled with image processing are presented in this paper. The principle of the sensor under development is based on the ionization of chemical species under intense electrical fields and the detection by optical sensors of photons created by glow discharges. Electrodes optimization...
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