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<p>When the ambient relative humidity (RH) exceeds the critical RH of a component in food, medicine, or electronic components, it can have negative effects leading to spoilage, degradation, or corrosion. Simple low-cost systems for monitoring humidity threshold violations are crucial but challenging. Here, we report a simple, cost-effective strategy to prepare a polymer composite material that irreversibly activates a change in impedance above a critical humidity threshold. These materials use a composite film containing a polymer matrix, CuSO4, and Zn. This polymer composite film condenses water vapor above the equilibrium relative humidity (ERH) of CuSO<sub>4</sub>, allowing ion solvation and interactions within the dielectric polymer matrix. The subsequent electroless deposition of copper creates percolation networks, reducing the impedance of the film and serving as an irreversible electronic indicator of that specific humidity threshold. Impedance methods found that this composite film triggers above 75% RH. Our redox-active polymer composite thus offers a promising strategy for tracking humidity threshold violations that consumer goods may experience. New insights into the irreversible impedance changes triggered by humidity provide a foundation for the development of irreversible impedance-based humidity sensors for consumer protection applications that can be triggered over a range of user-defined humidity thresholds.</p>

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Dank sensor materials: single-use humidity threshold indicators based on redox-active composites

  • 期刊论文

  • 发表日期：

    2026年1月7日

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  • Osemudiamhen D. Amienghemhen,
  • Dallin Shaffer,
  • Stacey J. Smith,
  • Walter F. Paxton

摘要

When the ambient relative humidity (RH) exceeds the critical RH of a component in food, medicine, or electronic components, it can have negative effects leading to spoilage, degradation, or corrosion. Simple low-cost systems for monitoring humidity threshold violations are crucial but challenging. Here, we report a simple, cost-effective strategy to prepare a polymer composite material that irreversibly activates a change in impedance above a critical humidity threshold. These materials use a composite film containing a polymer matrix, CuSO4, and Zn. This polymer composite film condenses water vapor above the equilibrium relative humidity (ERH) of CuSO4, allowing ion solvation and interactions within the dielectric polymer matrix. The subsequent electroless deposition of copper creates percolation networks, reducing the impedance of the film and serving as an irreversible electronic indicator of that specific humidity threshold. Impedance methods found that this composite film triggers above 75% RH. Our redox-active polymer composite thus offers a promising strategy for tracking humidity threshold violations that consumer goods may experience. New insights into the irreversible impedance changes triggered by humidity provide a foundation for the development of irreversible impedance-based humidity sensors for consumer protection applications that can be triggered over a range of user-defined humidity thresholds.