Abstract
Electrical conductivity and optical absorption are studied simultaneously for lead phthalocyanine films exposed to nitrogen dioxide to assess their relative merits for the development of a PbPc-based thin film NO 2 sensor. Additionally, frequency variations of an oscillating quartz crystal during NO 2 adsorption together with Fourier Transform Infrared analysis have been used to investigate diffusion and bonding of NO 2 at the surface and in the bulk of the films. The results indicate that sensors based on electrical conductivity offer a better response and recovery provided that exposure is limited. Long-term exposure prevents film recovery. This is related to the relatively slow in-diffusion of the NO 2 into the bulk, leading to an NO 2:PbPc molecular ratio of 4:1 in the bulk after extended exposure.
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