Stress-induced Chemical Detection Using Flexible Metal-Organic Frameworks
Stress-induced Chemical Detection Using Flexible Metal-Organic Frameworks
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DOI：
10.1021/ja805235k
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发表时间：
2008-11-05
影响因子：
15
通讯作者：
Hesketh, Peter J.
中科院分区：
文献类型：
--
作者：
Allendorf, Mark D.;Houk, Ronald J. T.;Hesketh, Peter J.
在这项工作中，我们展示了应力诱导的化学检测的概念，使用金属有机框架（MOFs）通过集成薄膜的MOF HKUST-1与微悬臂梁表面。结果表明，分子吸附的能量，这会导致在MOF晶体结构的轻微扭曲，可以转换为机械能，以创建一个高度响应，可逆的，和选择性的传感器。该传感器响应水，甲醇和乙醇蒸气，但不产生任何响应的O-2的N-2。通过内置的压敏电阻测量的信号的幅度与浓度相关，并且可以拟合到朗缪尔等温线。此外，我们表明，水化状态的MOF层可以用来赋予选择性CO2。最后，我们报告的第一次使用表面增强拉曼光谱来表征的MOF膜的结构。我们的结论是，这些纳米多孔材料的合成多功能性举行。
In this work we demonstrate the concept of stress-induced chemical detection using metal-organic frameworks (MOFs) by integrating a thin film of the MOF HKUST-1 with a microcantilever surface. The results show that the energy of molecular adsorption, ehich causes slight distortions in the MOF crystal structure, can be converted to mechanical energy to create a highly responsive, reversible, and selective sensor. This sensor responds to water, methanol, and ethanol vapors, but yields no response to either N-2 of O-2. The magnitude of the signal, which is measured by a built-in piezoresistor, is correlated with the concentration and can be fitted to a Langmuir isotherm. Furthemore, we show that the hydration state of the MOF layer can be used to impart selectivity to CO2. Finally, we report the first use of surface-enhanced Raman spectroscopy to characterize the structure of a MOF film. We conclude that the synthetic versatility of these nanoporous materials holds.