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Anomalous phenomenon in pyridyl-imidazoperylene H2 gas sensor

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Organic pigments were once extensively investigated as a photoconductor for the electrophotographic photoreceptor. Nowadays, they play an important role as colorants for color copies as well as materials for optical discs, electroluminescence, FET etc. Here, we report another novel application of organic pigments for H2 gas sensors. We are involved in the research and development on H2 gas sensors utilizing high proton affinity of the pyridyl rings integrated in the title compound (PIP). An anomalous phenomenon in PIP-based H2 sensors has been observed that the sensor current increases even after H2 interruption. Two N-sites in PIP are found to be involved in the protonation: N1 at the pyridyl ring and N2 at the five-membered ring. Among these, N1 is especially sensitive to water moisture as well as H2; whereas N2 behaves as an ordinary proton acceptor as found in other pyridylring-integrted pigments. The anomalous effect is found to be due to the former N1 behavior.

Document Type: Research Article

Publication date: 2007-01-01

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