Hydrazine Detection Using Langmuir-Blodgett Films of a Nickel Dithiolene Complex on Chemiresistor Sensors

摘要

Films of bis(diethylaminodithiobenzil)nickel, BDN, can be spread on the Langmuir trough, but do not transfer uniformly to quartz substrates. Mixed films containing BDN and stearyl alcohol in a 1:1 molar ratio will transfer and are electrically conductive. Chemiresistor senors were fabricated by depositing 5, 11, 21, 33, or 45 layers onto interdigital electrodes. The current through these sensors increases by three orders of magnitude on exposure to ppb levels of hydrazine, with high signal to noise ratios. Exposure to potential interferents such as ammonia at 29 ppm or 60% relative humidity at room temperature caused current increases of only 10 to 20 fold. These sensors are promising for use in alarm devices for hydrazine. The influence of the number of LB layers on sensor response characteristics has been examined. Keywords: Vapor sensor, Microsensor, Chemiresistor, Hydrazine, Dithiolene, Langmuir blodgett, Nickel. (mjm)