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<p>Fluent ion transport within conducting polymer channels can boost overall performance of organic electrochemical transistors (OECTs), which requires a highly accessible ion migration path. Here, we design highly crystalline Poly(3,4-ethylenedioxythiophene) (PEDOT) islands with an average lateral size of around 9.11 nm in channels of solid-state OECTs by in situ crosslinking poly(styrenesulfonate) chains via a progressive wet-spinning method. Compared with conventional condensed PEDOT channels, the reduced Warburg coefficient of 1299.4&#xa0;Ω·s<sup>−1/2</sup> in island PEDOT confirms the enhancement of ion dynamics and the opening of ion transport path, while the crystalline regions enable durable ion exchange ability and long-term operation of devices, resulting in an ultra-high <i>I</i><sub>on/off</sub> ratio of 9.2 × 10<sup>3</sup> and excellent stability over 3300 cycles. Meanwhile, the OECT also exhibits excellent short-term plasticity and multi-gas response capabilities. To simulate the capacity of olfactory receptors in encoding complex gases, we further fabricated an OECT sensor array including four functionalized gate materials. Combined with a convolutional neural network algorithm, the OECT sensor array achieved a high accuracy of 97.9% for identifying five gases. The engineered microstructure strategy of constructing island structures by controlling crystallization behavior offers a novel pathway for optimizing ion dynamics in conducting polymer and advancing high-performance bioelectronic devices.</p> Graphical Abstract <p></p>

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Engineering Conducting Polymer Islands Toward High-Performance Solid-State Organic Electrochemical Transistors for Gas Recognition

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月29日

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  • Liang Zhang,
  • Dongzi Yang,
  • Shouwen Zhu,
  • Yingying Huang,
  • Wenjie Xu,
  • Ning Ma,
  • Zengcai Zhao,
  • Kaiping Yuan,
  • Ming Wang,
  • Bo Fang,
  • Xiaoming Tao

摘要

Fluent ion transport within conducting polymer channels can boost overall performance of organic electrochemical transistors (OECTs), which requires a highly accessible ion migration path. Here, we design highly crystalline Poly(3,4-ethylenedioxythiophene) (PEDOT) islands with an average lateral size of around 9.11 nm in channels of solid-state OECTs by in situ crosslinking poly(styrenesulfonate) chains via a progressive wet-spinning method. Compared with conventional condensed PEDOT channels, the reduced Warburg coefficient of 1299.4 Ω·s−1/2 in island PEDOT confirms the enhancement of ion dynamics and the opening of ion transport path, while the crystalline regions enable durable ion exchange ability and long-term operation of devices, resulting in an ultra-high Ion/off ratio of 9.2 × 103 and excellent stability over 3300 cycles. Meanwhile, the OECT also exhibits excellent short-term plasticity and multi-gas response capabilities. To simulate the capacity of olfactory receptors in encoding complex gases, we further fabricated an OECT sensor array including four functionalized gate materials. Combined with a convolutional neural network algorithm, the OECT sensor array achieved a high accuracy of 97.9% for identifying five gases. The engineered microstructure strategy of constructing island structures by controlling crystallization behavior offers a novel pathway for optimizing ion dynamics in conducting polymer and advancing high-performance bioelectronic devices.

Graphical Abstract