电容感应
材料科学
薄膜
检出限
制作
氨
电极
选择性
化学工程
光电子学
图层(电子)
纳米技术
分析化学(期刊)
化学
色谱法
有机化学
电气工程
催化作用
物理化学
病理
替代医学
工程类
医学
作者
Ayalew H. Assen,Omar Yassine,Osama Shekhah,Mohamed Eddaoudi,Khaled N. Salama
出处
期刊:ACS Sensors
[American Chemical Society]
日期:2017-08-28
卷期号:2 (9): 1294-1301
被引量:210
标识
DOI:10.1021/acssensors.7b00304
摘要
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.
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