Strategic Approach towards Highly Sensitive Ammonia Gas Detection: Stable Radical Anion Formation of Rylene Diimide Semiconductors with Perfluorinated Chains
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In this work, we show a strategic approach to achieve highly NH3 sensitive SRAF films and their OFET gas sensors through rationale molecular design and device engineering. New rylene diimide derivatives used in this study introduce N-substituted linear-shaped perfluoroalkyl groups that exhibit stronger electron-withdrawing capability and smaller steric hindrance compared to previously reported benzyl and phenyl EWGs and perylene diimide (PDI) semiconducting core that have larger area ofπ-conjugated bridge (i.e., larger gas-adsorption area) than NDI core. Based on these systemic molecular design combined with optimization of device structures, PDI-based OFETs showed unprecedentedly high gas-responsivity. These results suggest that incorporation of rationale combination of electron-deficient core skeleton and EWG substituents is a simple design rule and offers very effective way for fabricating highly sensitive amperometric Lewis base gas sensors.