This work reports on the fabrication and deployment of a select metal–organic framework (MOF) thin film as an advanced chemical capacitive sensor for the sensing/detection of ammonia (NH₃) at room temperature. Namely, the MOF thin film sensing layer consists of a rare-earth (RE) MOF (RE-fcu-MOF) deposited on a capacitive interdigitated electrode (IDE). Purposely, the chemically stable naphthalene-based RE-fcu-MOF (NDC-Y-fcu-MOF) was elected and prepared/arranged as a thin film on a prefunctionalized capacitive IDE via the solvothermal growth method. Unlike earlier realizations, the fabricated MOF-based sensor showed a notable detection sensitivity for NH₃ at concentrations down to 1 ppm, with a detection limit appraised to be around 100 ppb (at room temperature) even in the presence of humidity and/or CO₂. Distinctly, the NDC-Y-fcu-MOF based sensor exhibited the required stability to NH₃, in contrast to other reported MOFs, and a remarkable detection selectivity toward NH₃ vs CH₄, NO₂, H₂, and C₇H₈. The NDC-Y-fcu-MOF based sensor exhibited excellent performance for sensing ammonia for simulated breathing system in the presence of the mixture of carbon dioxide and/or humidity (water vapor), with no major alteration in the detection signal.

中文翻译：

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用于氨气敏感检测的MOF：将fcu-MOF薄膜部署为有效的化学电容传感器

这项工作报告了一种选择的金属-有机框架（MOF）薄膜的制造和部署，该薄膜是一种用于在室温下感测/检测氨（NH ₃）的高级化学电容传感器。即，MOF薄膜感测层由沉积在电容式叉指电极（IDE）上的稀土（RE）MOF（RE- fcu -MOF ）组成。故意地，选择了化学稳定的萘基RE- fcu -MOF （NDC-Y - fcu - MOF），并通过溶剂热生长方法在预功能化的电容式IDE上制备/安排为薄膜。与早期的实现不同，基于MOF的传感器对NH ₃表现出显着的检测灵敏度在低至1 ppm的浓度下，即使在存在湿气和/或CO ₂的情况下，检测限也被认为约为100 ppb（在室温下）。显然，与其他已报道的MOF相比，基于NDC-Y- fcu - MOF的传感器对NH ₃表现出所需的稳定性，并且对NH _3相对于CH ₄，NO ₂，H ₂和C ₇ H _8的检测选择性显着。。在NDC-Y- FCU-基于MOF的传感器在存在二氧化碳和/或湿度（水蒸气）的混合物的情况下，具有出色的感测模拟呼吸系统氨气的性能，并且检测信号没有重大变化。