Ultrafast, Sensitive, And Long-Lasting Bioelectrochemical Transistors

Supramolecular crown ethers and fluorinated polymers enable the formation of high ionic conductivity, water-impermeable artificial ion channels for bioelectronic transistor applications.
Problem:
Organic electrochemical transistors (OECTs) are central to bioelectronics by enabling sensitive amplification of weak biological signals through ionic-electronic coupling in aqueous environments. Stakeholders widely integrate OECTs into biological systems for various applications, including neuromodulation, implantable devices, and wearable biosensors. OECTs’ softness and biocompatibility allow seamless integration with living tissue. However, current OECTs suffer from tradeoffs between ionic doping and performance, while prolonged fluid contact causes swelling, degradation, and slower transistor on-off switching speeds. These limitations hinder in vivo long-term biological use. Nonetheless, global demand for OECTs is rapidly growing, with the organic transistor market projected to reach USD 568 billion by 2031 (CAGR 20.35%).
Solution:
The invention material, Aqua‑Repelling Ion Flux Crown (ARIF‑Crown), mimics selective ion channels of cellular membranes by using crown ether cavities that self‑assemble within a water‑resistant fluorinated polymer matrix. This enables rapid ion transport without succumbing to water penetration. By overcoming the conductivity-stability tradeoffs from conventional counterparts, ARIF-Crown enables high-speed, sensitive, and durable OECTs for the next-generation bioelectronics.
Technology:
ARIF-Crown integrates self-assembling urea crown-ether ion channels within a water-impermeable fluorinated polymer scaffold. Electron-rich oxygen atoms in the crown ethers enable efficient and selective cation transport, while the urea groups drive self-assembly into columnar ion channels. Using reversible addition-fragmentation chain-transfer (RAFT) polymerization, the inventors precisely polymerize and tune the ratio of ion-conductive crown ethers and hydrophobic fluorinated polymers to balance conductivity and water resistance. ARIF-Crown OECTs achieve rapid ion transport without swelling, enabling stable, high-performance operation for long-term and in vivo bioelectronics.
Advantages:

Ultrafast response time of ~1.3 μs, delivering ~100X faster switching than conventional OECTs without ARIF-Crown
Exceptional long-term stability, retaining 96% of initial current after 4 weeks and sustaining >6,000 electrochemical cycles with 97% performance retention
High signal amplification, achieving a transconductance gain of 53.8 mS
Scalable platform technology, demonstrating the successful fabrication of dense 10x10 transistor arrays with 99% device yield and uniform performance
Advanced in vivo capability, enabling real‑time dopamine monitoring in anesthetized rat brains

Stage of Development:

Bench Prototype

Figure A. compares biological membranes and ARIF-Crown artificial ion channels, showing separated structures that enable ion transport while blocking water uptake. Figure B. shows how ARIF-Crown enables stable OECT operation by allowing ion transport without water-induced degradation, while the crown ethers promote partial dehydration of ion. Figure C. shows that ARIF-Crown OECTs improve gain-bandwidth and performance-stability tradeoffs compared to conventional OECTs. Figure D. consists of photographs showing the flexible high-density ARIF-Crown OECT arrays with 100 transistors (left) and 960 transistors (right). Scale bars: 3 cm (left), 1 cm (right).
Intellectual Property: