Abstract
Two isomeric croconate polymers, para-polymerized bi-(phenylamino)-croconate (p-PAC), and ortho-bi-(phenylamino)-croconate (o-PAC), were synthesized to investigate the relationship between the planarity and sensory performance relative to NO2 detection. The as-fabricated sensors realized the detection of NO2 at the parts-per-billion level with excellent selectivity and long-term stability (more than 60 d). The better planarity of p-PAC resulted in better charge transfer efficiency and crystallinity. Finally, p-PAC achieved a lower detection limit (40 ppb) and higher sensitivity. This study demonstrates that planarity in the polymer chain is a critical factor in sensory performance.
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