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<p>Barium contamination poses severe environmental and health risks, yet current detection techniques rely on bulky instrumentation or laborious sample preparation, limiting their field applicability. Addressing the critical need for sustainable water safety monitoring, we developed an n-type bilayer organic electrochemical transistor biosensor, which integrates a molecularly engineered conformation-locked oxa-fused oligomer channel from metal-free green chemistry with an aza-crown-ether functionalized ion-selective interface, synergistically enhancing sensitivity and selectivity for sustainable barium ions monitoring. This breakthrough with oxa-fused design overcomes traditional limitations of molecular materials in field deployment, offering low-power operation and exceptional stability, stemming from the lowest unoccupied molecular orbital energy level and tightly packed molecular arrangement. The advanced biosensor employs a photoinduced electron transfer mechanism to achieve an unprecedented limit of detection of 10 nM for Ba<sup>2+</sup> detection in real-time drinking/tap water analysis. Its molecular design principles and device configuration establish a sustainable paradigm for developing robust field-deployable sensors, an area previously considered beyond the reach of monodisperse low molecular-weight materials.</p>

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Ultrastable n-type organic electrochemical transistors enabled by oxa-fused mixed oligomeric conductor and bilayer architecture for barium ions biosensors

  • 期刊论文

  • 发表日期：

    2026年2月25日

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  • Jiayao Duan,
  • Shengyu Cong,
  • Genming Zhu,
  • Yiming Wang,
  • Junxin Chen,
  • Xiuyuan Zhu,
  • Zhengke Li,
  • Mingfei Xiao,
  • Tao Zhang,
  • Wan Yue

摘要

Barium contamination poses severe environmental and health risks, yet current detection techniques rely on bulky instrumentation or laborious sample preparation, limiting their field applicability. Addressing the critical need for sustainable water safety monitoring, we developed an n-type bilayer organic electrochemical transistor biosensor, which integrates a molecularly engineered conformation-locked oxa-fused oligomer channel from metal-free green chemistry with an aza-crown-ether functionalized ion-selective interface, synergistically enhancing sensitivity and selectivity for sustainable barium ions monitoring. This breakthrough with oxa-fused design overcomes traditional limitations of molecular materials in field deployment, offering low-power operation and exceptional stability, stemming from the lowest unoccupied molecular orbital energy level and tightly packed molecular arrangement. The advanced biosensor employs a photoinduced electron transfer mechanism to achieve an unprecedented limit of detection of 10 nM for Ba2+ detection in real-time drinking/tap water analysis. Its molecular design principles and device configuration establish a sustainable paradigm for developing robust field-deployable sensors, an area previously considered beyond the reach of monodisperse low molecular-weight materials.