arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1909.13397cond-mat.mtrl-scicond-mat.mes-hallphysics.app-ph
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离子交换凝胶增强水溶液中有机电化学晶体管的性能

Ion exchange gels enhance organic electrochemical transistor performance in aqueous solution

Connor G. Bischak, Lucas Q. Flagg, David S. Ginger

摘要:

基于共轭聚合物的有机电化学晶体管(OECTs)正在研究从生物化学传感到神经接口的应用。虽然正在开发新的共轭聚合物,可以将数字电子产品与生命的水化学物质相结合,但过去几十年开发的绝大多数高性能,高迁移率有机晶体管材料在吸收生物相关离子方面非常差。在这里,我们将离子交换凝胶到OECT中,证明这种结构能够从溶液中吸收生物相关的离子,并将更大、更疏水的离子注入到多个疏水共轭聚合物中的底层聚合物半导体活性层中。使用聚[2,5-二(3-十四烷基噻吩-2-基)噻吩并[3,2-b]噻吩](PBTTT)作为模型半导体活性层和离子液体1-丁基-3-甲基咪唑双三氟甲磺酰亚胺(BMIM TFSI)和聚乙烯偏二氟乙烯-六氟丙烯共聚物(PVDF-HFP)作为离子交换凝胶,我们证明了OECT装置的灵敏度提高了四个数量级以上,离子注入动力学提高了一百倍。我们证明了离子交换凝胶OECT记录生物信号的能力,通过测量的捕蝇草植物的动作电位。这些结果显示了使用界面工程来开辟更广泛的有机半导体材料作为可以通过水溶液门控的OECTs的可能性。

英文摘要:

Conjugated polymer-based organic electrochemical transistors (OECTs) are being studied for applications ranging from biochemical sensing to neural interfaces. While new conjugated polymers are being developed that can interface digital electronics with the aqueous chemistry of life, the vast majority of high-performance, high-mobility organic transistor materials developed over the past decades are extremely poor at taking up biologically-relevant ions. Here we incorporate an ion exchange gel into an OECT, demonstrating that this structure is capable of taking up biologically-relevant ions from solution and injecting larger, more hydrophobic ions into the underlying polymer semiconductor active layer in multiple hydrophobic conjugated polymers. Using poly[2,5-bis(3-tetradecylthiophen-2-yl) thieno[3,2-b]thiophene] (PBTTT) as a model semiconductor active layer and a blend of the ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (BMIM TFSI) and poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) as the ion exchange gel, we demonstrate more than a four order of magnitude improvement in OECT device transconductance and a one hundred-fold increase in ion injection kinetics. We demonstrate the ability of the ion exchange gel OECT to record biological signals by measuring the action potentials of a Venus flytrap plant. These results show the possibility of using interface engineering to open up a wider palette of organic semiconductor materials as OECTs that can be gated by aqueous solutions.

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