<br>用（3-缩水甘油氧丙基）三甲氧基硅烷（GOPS）作为共混的替代品进行表面功能化，以增强 PEDOT：PSS 薄膜的水稳定性和电子性能,ACS Applied Materials & Interfaces

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用（3-缩水甘油氧丙基）三甲氧基硅烷（GOPS）作为共混的替代品进行表面功能化，以增强 PEDOT：PSS 薄膜的水稳定性和电子性能
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-11-14 , DOI: 10.1021/acsami.3c09452
Peter O Osazuwa ₁ , Chun-Yuan Lo ₂ , Xu Feng ₂ , Abigail Nolin ₁ , Charles Dhong _{1,

3} , Laure V Kayser _{1,

2}

Affiliation

有机混合离子-电子导体，如聚（3,4-乙烯二氧噻吩）:p（苯乙烯磺酸盐）（PEDOT：PSS），由于其耦合和传输离子和电子电荷的独特能力，是制造生物电子器件的重要材料。对生物电子设备的兴趣日益浓厚，导致了有机电化学晶体管（OECT）的发展，这种晶体管可以在水溶液中运行，并将生物来源的离子信号转化为可测量的电子信号。OECT 的一个常见挑战是保持 PEDOT：PSS 薄膜在水性条件下运行的稳定性和性能。虽然将 PEDOT：PSS 分散体与交联剂（如（3-缩水甘油酰氧丙基）三甲氧基硅烷（GOPS））混合的传统方法有助于确保薄膜与器件基材的牢固粘附力，但它也会影响 PEDOT：PSS 薄膜的形态和电气性能，从而导致 OECT 的性能显著降低。在这项研究中，我们只用 GOPS 对器件基板的表面进行功能化，以引入硅烷单层，然后再在基板上旋涂 PEDOT：PSS 分散体。在所有情况下，使用 GOPS 单层而不是混合物都会提高电子性能指标，例如 OECT 器件中的电子电导率、体积电容和迁移率-电容积 [μC*] 值高出三倍，最终导致非晶 PEDOT：PSS 的创纪录值达到 406 ± 39 F cm^–1 V^–1 s^–1。这种性能的提高并不以牺牲操作稳定性为代价，因为在受到脉冲栅极偏置应力、长期电化学循环测试和超过 150 天的老化时，共混物和表面功能化都显示出相似的性能。总体而言，本研究建立了一种使用 GOPS 作为表面单层而不是混合交联剂的新方法，以实现在水中稳定的高性能有机混合离子-电子导体，用于生物电子学。

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Surface Functionalization with (3-Glycidyloxypropyl)trimethoxysilane (GOPS) as an Alternative to Blending for Enhancing the Aqueous Stability and Electronic Performance of PEDOT:PSS Thin Films

Organic mixed ionic–electronic conductors, such as poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), are essential materials for the fabrication of bioelectronic devices due to their unique ability to couple and transport ionic and electronic charges. The growing interest in bioelectronic devices has led to the development of organic electrochemical transistors (OECTs) that can operate in aqueous solutions and transduce ionic signals of biological origin into measurable electronic signals. A common challenge with OECTs is maintaining the stability and performance of the PEDOT:PSS films operating under aqueous conditions. Although the conventional approach of blending the PEDOT:PSS dispersions with a cross-linker such as (3-glycidyloxypropyl)trimethoxysilane (GOPS) helps to ensure strong adhesion of the films to device substrates, it also impacts the morphology and thus electrical properties of the PEDOT:PSS films, which leads to a significant reduction in the performance of OECTs. In this study, we instead functionalize only the surface of the device substrates with GOPS to introduce a silane monolayer before spin-coating the PEDOT:PSS dispersion on the substrate. In all cases, having a GOPS monolayer instead of a blend leads to increased electronic performance metrics, such as three times higher electronic conductivity, volumetric capacitance, and mobility–capacitance product [μC*] value in OECT devices, ultimately leading to a record value of 406 ± 39 F cm^–1 V^–1 s^–1 for amorphous PEDOT:PSS. This increased performance does not come at the expense of operational stability, as both the blend and surface functionalization show similar performance when subjected to pulsed gate bias stress, long-term electrochemical cycling tests, and aging over 150 days. Overall, this study establishes a novel approach to using GOPS as a surface monolayer instead of a blended cross-linker, for achieving high-performance organic mixed ionic–electronic conductors that are stable in water for bioelectronics.

更新日期：2023-11-14

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