Effects of adsorbed NO2 on surface semi-conductivity of single crystals and sublimed films of metal phthalocyanines and hemiporphyrazines are reported. The magnitude and reversibility of conductivity increases are related to chemical factors, while data on the rate and reproducibility of the increases are interpreted in terms of the surface structure of the materials. The potential of organic semiconductors as electronic gas sensors is discussed.
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Wright et al. (1983) studied this question.
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