Carbon dioxide (CO₂) has been linked to many deleterious health effects, and it has also been used as a proxy for building occupancy measurements. These applications have created a need for low-cost and low-power CO₂ sensors that can be seamlessly incorporated into existing buildings. We report a resonant mass sensor coated with a solution-processable polymer blend of poly(ethylene oxide) (PEO) and poly(ethyleneimine) (PEI) for the detection of CO₂ across multiple use conditions. Controlling the polymer blend composition and nanostructure enabled better transport of the analyte gas into the sensing layer, which allowed for significantly enhanced CO₂ sensing relative to the state of the art. Moreover, the hydrophilic nature of PEO resulted in water uptake, which provided for higher sensing sensitivity at elevated humidity conditions. Therefore, this key integration of materials and resonant sensor platform could be a potential solution in the future for CO₂ monitoring in smart infrastructure.

二氧化碳 (CO ₂ ) 与许多有害的健康影响有关，它也被用作建筑物占用测量的代理。这些应用产生了对可以无缝集成到现有建筑物中的低成本和低功耗 CO ₂传感器的需求。我们报告了一种共振质量传感器，该传感器涂有聚环氧乙烷 (PEO) 和聚乙撑亚胺 (PEI) 的可溶液加工聚合物混合物，用于在多种使用条件下检测 CO ₂。控制聚合物共混物的组成和纳米结构可以更好地将分析物气体传输到传感层，从而显着增强 CO ₂相对于现有技术的传感。此外，PEO 的亲水性导致吸水，这在高湿度条件下提供了更高的传感灵敏度。因此，材料和谐振传感器平台的这种关键集成可能是未来智能基础设施中CO ₂监测的潜在解决方案。