Abstract
Effect of substrate temperature on microstructure of copper phthalocyanine (CuPc) thin films deposited on quartz and polycrystalline alumina substrates by vacuum sublimation technique has been studied. The films undergo a transition from α phase at lower substrate temperatures to β phase for temperatures above 200 °C. A simultaneous change in morphology from granular to nano-fibrous films was observed. Resistance of α phase films increased by more than one order of magnitude on initial application of electric field requiring stabilization for several hours, while β phase films did not show any drift. This behavior was attributed to oxygen absorption/desorption under applied field. Sensitivity of films for detection of NO 2 gas at room temperature was found to be higher for films in the α-phase with nano-fibrous morphology. Methodology was devised for measurement of NO 2 concentration in ppm range with good response and recovery times. With this methodology, the sensors showed very good stability in response (at room temperature) for a period of 1 year.
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