Formaldehyde (HCHO) is a major indoor pollutant that is extremely harmful to human health even at ppb-level. Meanwhile, ppb-level HCHO is also a potential disease marker in the exhalation of patients with respiratory diseases. Higher humidity resistance and lower practical limit of detection (pLOD) both have to be pursued for practical HCHO sensors. In this work, by assembling indium oxide (InO) and fluorinated dipole modified reduced graphene oxide (rGO), we prepared a high-performance room temperature HCHO sensor (InO @ATQ-rGO). Excellent sensing properties toward HCHO under visible illumination have been achieved, including ultra-low pLOD of 3 ppb and high humidity-resistance. By control experiments and density functional theory calculation, it is indicated that the introduced fluorinated dipoles act as not only an "umbrella" to improve the humidity resistance of the composite, but also a "bridge" to accelerate the electron transport, improving the sensitivity of the material. The significant practicality and reliability of the obtained sensors were verified by in-situ simulation experiments using a 3 m test chamber with a humidity control system and by detection of the simulated lung disease patient’s exhalation. This work provides an effective strategy of simultaneously achieving high humidity-resistance and low pLOD of room temperature formaldehyde sensing materials.

中文翻译：

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基于氟化偶极子的“伞”和“桥”诱导的室温超高耐湿 ppb 级甲醛传感


甲醛（HCHO）是一种主要的室内污染物，即使达到 ppb 级，对人体健康也极为有害。同时，ppb级的HCHO也是呼吸系统疾病患者呼气中潜在的疾病标志物。实用的 HCHO 传感器必须追求更高的耐湿性和更低的实际检测限 (pLOD)。在这项工作中，通过组装氧化铟（InO）和氟化偶极改性还原氧化石墨烯（rGO），我们制备了高性能室温HCHO传感器（InO@ATQ-rGO）。在可见光照射下对 HCHO 具有优异的传感特性，包括 3 ppb 的超低 pLOD 和高耐湿性。通过控制实验和密度泛函理论计算表明，氟化偶极子的引入不仅充当了提高复合材料耐湿性能的“雨伞”，而且充当了加速电子传输的“桥梁”，提高了复合材料的灵敏度。材料。通过使用带湿度控制系统的3 m测试室的原位模拟实验以及对模拟肺病患者呼气的检测，验证了所获得的传感器的显着实用性和可靠性。这项工作提供了同时实现室温甲醛传感材料的高耐湿性和低pLOD的有效策略。