NO/sub 2/ gas detection characteristics of CuTBP (copper-tetra-tert-butylphthalocyanine) chemiresistor device made by LB technique

We investigated air/200 ppm NO/sub 2/ gas detection characteristics of CuTBP (Copper-tetra-tert-butylphthalocyanine) chemiresistor devices. The CuTBP films were made by Langmuir Blodgett (LB) techniques. Sensitivity, response time, recovery time, and reproducibility of the devices were measured by current-voltage characteristics. To increase sensitivity, interdigital electrode was used. It was found that a conductance G increases monotonically as the number of interdigital electrode N increases. And the sensitivity and reproducibility are stable. As far as the current is concerned, the current when N=25 is greater than that when N=1 by 70 or so. It indicates that the number of interdigital electrode affects the current, sensitivity and stability. We have also investigated applicability of the CuTBP chemiresistor device as a gas detector.