Metal-organic framework portable chemical sensor
Metal-organic framework portable chemical sensor
复制标题
DOI：
10.1016/j.snb.2020.128608
复制
发表时间：
2020-10-15
影响因子：
8.4
通讯作者：
Huang, Jie
中科院分区：
文献类型：
--
作者：
Zhu, Chen;Gerald, Rex E., II;Huang, Jie
将金属有机骨架材料的化学吸附特性与新型开口空心同轴电缆谐振器的介电灵敏度相结合，提出并实验验证了一种具有高化学选择性和高灵敏度的便携式气体传感器器件（OE-HCCR-MOF）。该器件的工作原理是基于主体MOF层的介电性质响应于客体分子的类型和浓度的变化而变化。MOF层的介电性质的变化修改微波谐振器的相位匹配条件，引起装置的谐振频率的偏移。通过监测共振频移，可以实时监测和准确定量客体分子的吸附。在概念验证演示中，将200 μ m的MOF（HKUST-1）层放置在OE-HCCR中，以开发原型OEHCCR-MOF传感器。这种新型传感器对二氧化碳浓度的变化具有很高的灵敏度，并具有良好的可逆性。还研究了原型传感器与甲烷相比对二氧化碳的化学选择性。
Combining the chemical-specific adsorption properties of metal-organic framework (MOF) materials with the dielectric sensitivity of a novel open-ended hollow coaxial cable resonator (OE-HCCR), a mechanically-robust and portable gas sensor device (OE-HCCR-MOF) with high chemical selectivity and sensitivity is proposed and experimentally demonstrated. The operating principle of the device is based on changes in the dielectric property of the host MOF layer in response to variations in the types and concentrations of guest molecules. The changes in the dielectric property of the MOF layer modify the phase-matching condition of the microwave resonator, causing shifts in the resonance frequency of the device. By monitoring the resonance frequency shift, the adsorptions of guest molecules can be monitored in real-time and accurately quantified. In proof-of-concept demonstrations, a 200-mu m layer of MOF (HKUST-1) was placed within an OE-HCCR to develop a prototype OEHCCR-MOF sensor. The novel sensor showed high sensitivity to variations in the concentrations of carbon dioxide with good reversibility. The chemical selectivity of the prototype sensor for carbon dioxide compared to methane was also investigated.