Oh Seung-Hyun, Oh Minseok, Lee Seongi, Kim Do-Kyun, Lee Jong-Sung, Lee Sol-Kyu, Kang Seung-Kyun, Joo Young-Chang
Department of Materials Science & Engineering, Seoul National University, Seoul 151-744, Korea.
ACS Appl Mater Interfaces. 2023 Aug 23;15(33):39614-39624. doi: 10.1021/acsami.3c04590. Epub 2023 Aug 9.
Bioelectronic devices that offer real-time measurements, biological signal processing, and continuous monitoring while maintaining stable performance are in high demand. The materials used in organic electrochemical transistors (OECTs) demonstrate high transconductance (GM) and excellent biocompatibility, making them suitable for bioelectronics in a biological environment. However, ion migration in OECTs induces a delayed response time and low cut-off frequency, and the adverse biological environment causes OECT durability problems. Herein, we present OECTs with a faster response time and improved durability, made possible by using a nanofiber mat channel of a conventional OECT structure. Poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS)/polyacrylamide (PAAm) nanofiber mat channel OECTs are fabricated and subjected to various durability tests for the first time based on continuous measurements and mechanical stability assessments. The results indicate that the nanofiber mat channel OECTs have a faster response time and longer life spans compared to those of film channel OECTs. The improvements can be attributed to the increased surface area and fibrous structure of the nanofiber mat channel. Furthermore, the hydrogel helps to maintain the structure of the nanofiber, facilitates material exchange, and eliminates the need for a crosslinker.
对能够进行实时测量、生物信号处理以及持续监测，同时保持稳定性能的生物电子设备有着很高的需求。有机电化学晶体管（OECT）中使用的材料具有高跨导（GM）和出色的生物相容性，使其适用于生物环境中的生物电子学。然而，OECT中的离子迁移会导致响应时间延迟和截止频率较低，并且恶劣的生物环境会引发OECT的耐久性问题。在此，我们展示了具有更快响应时间和更高耐久性的OECT，这通过使用传统OECT结构的纳米纤维垫通道得以实现。聚（3,4-乙撑二氧噻吩）聚苯乙烯磺酸盐（PEDOT:PSS）/聚丙烯酰胺（PAAm）纳米纤维垫通道OECT被制造出来，并基于连续测量和机械稳定性评估首次进行了各种耐久性测试。结果表明，与薄膜通道OECT相比，纳米纤维垫通道OECT具有更快的响应时间和更长的寿命。这些改进可归因于纳米纤维垫通道的表面积增加和纤维结构。此外，水凝胶有助于维持纳米纤维的结构，促进物质交换，并消除了对交联剂的需求。
