In this paper, we study a novel chemical gas sensor based on polymer-carbon black composites for NO2 gas-sensing
application. The polymer which is made of polyhexylthiophene mixed with carbon black is employed as the sensing
material which is immobilized on the interdigitated microelectrode pair. The electric resistance changes of the sensor to
NO2 at different concentrations have been examined. Also the effect of the humidity to the sensor was examined. The
results show that the resistance of the sensor decreases with the NO2 concentration rising, and it's not sensitive to the
humidity.
Chemical gas sensor that utilizes poly (2-vinypyridine)-carbon black composition as sensitive film is studied. Poly
(2-vinypyridine)-carbon black was deposited on the interdigital microelectrodes via spin-coating method to detect
organic vapor and humidity. To study the influence of the carbon black, poly (2-vinypyridine)-carbon black composites
with different carbon black content were compared. The various characteristics such as sensitivity and selectivity of poly
(2-vinypyridine)-carbon black based sensor have been studied. The results show that proper carbon black content and
modified carbon black can improve the sensors' response characteristics.
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