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<p>PEDOT:PSS is a versatile conducting polymer renowned for high conductivity, flexibility, environmental stability, and biocompatibility, making it ideal for wearable organic transistors. Conventional PEDOT:PSS-based organic electrochemical transistors (OECTs) are limited to depletion mode operation, hindering their potential for advanced neuromorphic systems and complementary circuit designs. This study introduces a novel approach using graphene oxide (GO) coating on PEDOT:PSS microfibers (PMFs) fabricated via wet-spinning sol–gel method to enable accumulation mode operation. The GO modification, enriched with oxygen-containing functional groups (–OH, –COOH, and –O–), introduces ion trap states and enhances ionic-electronic coupling through negatively charged surface modulation. Optimal GO concentration (5&#xa0;mg&#xa0;mL⁻<sup>1</sup>) achieved <i>μC</i>* of 631.40 F cm⁻<sup>1</sup>&#xa0;V⁻<sup>1</sup>&#xa0;s⁻<sup>1</sup> in accumulation mode with <i>I</i><sub>on</sub>/<i>I</i><sub>off</sub> of 50.90, significantly outperforming pristine PMF OECTs. The devices demonstrated exceptional mechanical durability, maintaining structural integrity after 1500 bending cycles with minimal resistance change. Moreover, GO-coated PMF OECTs exhibited remarkable synaptic properties including enhanced paired-pulse facilitation (136% vs. 120% for conventional PEDOT:PSS), robust long-term memory retention over 1000&#xa0;s, and successful associative learning mimicking Pavlovian conditioning. This advancement enables next-generation adaptive neuromorphic electronics and wearable bioelectronic systems with enhanced operational versatility and biomimetic functionality.</p> Graphical abstract <p></p>

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Simple fabrication of PEDOT: PSS-based microfiber organic electrochemical transistors for neuromorphic memory applications

  • 期刊论文

  • 发表日期：

    2026年3月19日

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  • Seung Min Lee,
  • Yonghee Kim,
  • Gyu Won Woo,
  • Jung Ha Kim,
  • Yong Hyun Kim,
  • Yun-seok Jun,
  • Eun Kwang Lee

摘要

PEDOT:PSS is a versatile conducting polymer renowned for high conductivity, flexibility, environmental stability, and biocompatibility, making it ideal for wearable organic transistors. Conventional PEDOT:PSS-based organic electrochemical transistors (OECTs) are limited to depletion mode operation, hindering their potential for advanced neuromorphic systems and complementary circuit designs. This study introduces a novel approach using graphene oxide (GO) coating on PEDOT:PSS microfibers (PMFs) fabricated via wet-spinning sol–gel method to enable accumulation mode operation. The GO modification, enriched with oxygen-containing functional groups (–OH, –COOH, and –O–), introduces ion trap states and enhances ionic-electronic coupling through negatively charged surface modulation. Optimal GO concentration (5 mg mL⁻1) achieved μC* of 631.40 F cm⁻1 V⁻1 s⁻1 in accumulation mode with Ion/Ioff of 50.90, significantly outperforming pristine PMF OECTs. The devices demonstrated exceptional mechanical durability, maintaining structural integrity after 1500 bending cycles with minimal resistance change. Moreover, GO-coated PMF OECTs exhibited remarkable synaptic properties including enhanced paired-pulse facilitation (136% vs. 120% for conventional PEDOT:PSS), robust long-term memory retention over 1000 s, and successful associative learning mimicking Pavlovian conditioning. This advancement enables next-generation adaptive neuromorphic electronics and wearable bioelectronic systems with enhanced operational versatility and biomimetic functionality.

Graphical abstract