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异常NH₃检测通过Cu(cyhdc) MOF传感器由于H₂O共吸收

Leo J Small¹, Stephen J Percival¹, Matthew J Hurlock¹

¹Sandia National Laboratories, Albuquerque, New Mexico 87185, United States.

ACS applied materials & interfaces

|October 8, 2025

概括

一个新的金属有机框架 (MOF) 传感器通过利用水共吸收来增强有毒氨的检测. 这种基于MOF的传感器对微量氨有显著的电反应,特别是在高湿度下.

科学领域:

材料科学材料科学材料科学
化学传感器化学传感器
环境监测环境监测

背景情况:

金属有机框架 (MOF) 在电阻传感器中越来越多地用于检测有毒气体.
检测微量氨 (NH3) 是具有挑战性的,因为它的低电响应.
MOF选择可以通过与水等大气气体的共吸收来增强电反应.

研究的目的:

展示一种基于MOF的传感器,用于增强对环境有毒氨气 (NH3) 的检测.
研究水共同吸收在增强传感器对NH3.3的电反应中的作用.
描述MOF的结构完整性和吸附机制.

主要方法:

基于Cu ((cyhdc) MOF的电阻传感器的制造和测试.
在不同的温度下,将传感器暴露在不同度的NH3和相对湿度 (RH) 中.
使用热重力测量分析 (TGA),X射线光电子光谱学 (XPS),里埃变换红外光谱学 (FT-IR) 和微观结构分析进行了表征.

主要成果:

(cyhdc) 传感器在暴露于5ppmNH3时显示出显著的阻抗变化,特别是在≥30%的RH时.
传感器响应随RH增加,在92%RH时达到3170×放大,这是MOF直接电传感器报告的最高值.
在没有水的情况下没有观察到对NH3的反应,并且在吸附过程中保持了结构完整性.

结论:

在Cu上NH3和H2O的共同吸收 (cyhdc) MOF显著提高了电气检测能力.
这种增强的反应归因于NH3和H2O共吸收所带来的表面电容增加.
这项研究表明,通过使用MOF传感器和协同吸收效应,实现微量有毒气体的电气检测的可行策略.

关键词:

氨是一种氨.有竞争力的气体吸附.气体传感器是一个气体传感器.阻抗光谱法阻抗光谱法金属-有机的框架.选择性的选择性

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