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有机场效应晶体管在化学和生物传感、国土安全、环境监测、工业生产、医疗生物检测中具有很大的应用前景.如何提高基于有机场效应晶体管传感器的灵敏度和选择性的研究已有很多报导.本文用四种具有不同长度的烷基侧链和相同π–π共轭结构的有机半导体来制备有机场效应晶体管,集中研究有机半导体的分子结构.烷基侧链可以减缓氨气在有机半导体层中的扩散,阻止氨气和导电通道之间的相互作用.研究结果揭示了改变烷基侧链长度和薄膜厚度可以调控传感器的灵敏度,这些结果有助于指导有机半导体材料的分子设计和种类选择.
Organic field effect transistors have great application prospects in chemical and biological sensing, homeland security, environmental monitoring, industrial production, medical biological detection, etc. There have been many reports on how to improve the sensitivity and selectivity of organic field effect transistor-based sensors In this paper, organic field effect transistors are prepared by using four kinds of organic semiconductors with alkyl side chains of different lengths and the same π-π conjugated structure, and focus on the molecular structure of organic semiconductors. Alkyl side chains can slow down the ammonia in organic semiconductors Layer to prevent the interaction between ammonia and conductive channels.The results reveal that changing the length of side chain and the thickness of the membrane can control the sensitivity of the sensor.These results can help guide the molecular design and species of organic semiconductor materials select.