In this study, three triarylamine derivatives (TPCAs) were designed to investigate the NO₂ detection capability of amorphous organic semiconductors (OSCs). The TPCAs exhibited pure amorphous characteristics with nominal differences in molecular packing, but TPCA3M with three methoxy groups exhibited the highest sensitivity when confirmed with both fluorometric and field-effect transistor (FET)-based amperometric approaches. The associated NO₂ detection capability was identified with the formation of TPCA-NO₂ complex governed by the degree of charge transfer (CT) between electron donating TPCAs and electron accepting NO₂. In addition, it was demonstrated, using a FET-based gas sensor with a patterned active layer, that the degree of NO₂ diffusion is affected by molecular packing, which partly contributes to a high NO₂ detection sensitivity of TPCA3M. In addition, the slow response and recovery characteristics reveals the limitation of TPCA-based FET as a practical NO₂ sensor application, but the notable correlation between the structure and sensing capability in TCPAs provides informative material design strategies to improve the sensitivity of NO₂ detection.

在这项研究中，设计了三种三芳基胺衍生物（TPCA）来研究非晶有机半导体（OSC）的NO ₂检测能力。TPCA表现出纯的无定形特征，分子堆积不同，但是带有荧光基团和基于场效应晶体管（FET）的安培法都证实了具有三个甲氧基的TPCA3M表现出最高的灵敏度。通过供电子的TPCA和接受电子的NO ₂之间的电荷转移程度（CT）来控制TPCA-NO _2配合物的形成，从而确定了相关的NO ₂检测能力。。另外，使用具有图案化活性层的基于FET的气体传感器证明，NO ₂扩散程度受分子堆积的影响，这部分有助于TPCA3M的高NO ₂检测灵敏度。此外，缓慢的响应和恢复特性揭示了基于TPCA的FET在实际的NO ₂传感器应用中的局限性，但是TCPA中结构和传感能力之间的显着相关性提供了有益的材料设计策略，可提高NO ₂检测的灵敏度。。