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Metal–Organic Framework Thin Film Coated Optical Fiber Sensors: A Novel Waveguide-Based Chemical Sensing Platform
ACS Sensors ( IF 8.2 ) Pub Date : 2018-01-18 00:00:00 , DOI: 10.1021/acssensors.7b00808 Ki-Joong Kim 1, 2 , Ping Lu 1, 2 , Jeffrey T. Culp 1, 2 , Paul R. Ohodnicki 1, 3
ACS Sensors ( IF 8.2 ) Pub Date : 2018-01-18 00:00:00 , DOI: 10.1021/acssensors.7b00808 Ki-Joong Kim 1, 2 , Ping Lu 1, 2 , Jeffrey T. Culp 1, 2 , Paul R. Ohodnicki 1, 3
Affiliation
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Integration of optical fiber with sensitive thin films offers great potential for the realization of novel chemical sensing platforms. In this study, we present a simple design strategy and high performance of nanoporous metal–organic framework (MOF) based optical gas sensors, which enables detection of a wide range of concentrations of small molecules based upon extremely small differences in refractive indices as a function of analyte adsorption within the MOF framework. Thin and compact MOF films can be uniformly formed and tightly bound on the surface of etched optical fiber through a simple solution method which is critical for manufacturability of MOF-based sensor devices. The resulting sensors show high sensitivity/selectivity to CO2 gas relative to other small gases (H2, N2, O2, and CO) with rapid (<tens of seconds) response time and excellent reversibility, which can be well correlated to the physisorption of gases into a nanoporous MOF. We propose a refractive index based sensing mechanism for the MOF-integrated optical fiber platform which results in an amplification of inherent optical absorption present within the MOF-based sensing layer with increasing values of effective refractive index associated with adsorption of gases.
中文翻译：
金属有机框架薄膜涂覆的光纤传感器：基于波导的新型化学传感平台
光纤与敏感薄膜的集成为实现新型化学传感平台提供了巨大的潜力。在这项研究中，我们提出了一种基于纳米孔金属-有机框架（MOF）的光学气体传感器的简单设计策略和高性能，该技术能够根据折射率的极小差异来检测各种浓度的小分子。 MOF框架内分析物的吸附情况。可以通过简单的解决方法将薄而紧凑的MOF薄膜均匀地形成并紧紧束缚在蚀刻光纤的表面上，这对于基于MOF的传感器设备的可制造性至关重要。将得到的传感器显示出高灵敏度/选择性CO 2相对于其他小气体的气体（H 2，N2，O 2和CO）具有快速（<几十秒）的响应时间和出色的可逆性，这可以与气体在纳米多孔MOF中的物理吸附密切相关。我们为MOF集成光纤平台提出了一种基于折射率的传感机制，该机制会导致基于MOF的传感层内存在的固有光吸收随与气体吸附相关的有效折射率值的增加而增大。
更新日期：2018-01-18
中文翻译：
金属有机框架薄膜涂覆的光纤传感器：基于波导的新型化学传感平台
光纤与敏感薄膜的集成为实现新型化学传感平台提供了巨大的潜力。在这项研究中，我们提出了一种基于纳米孔金属-有机框架（MOF）的光学气体传感器的简单设计策略和高性能，该技术能够根据折射率的极小差异来检测各种浓度的小分子。 MOF框架内分析物的吸附情况。可以通过简单的解决方法将薄而紧凑的MOF薄膜均匀地形成并紧紧束缚在蚀刻光纤的表面上，这对于基于MOF的传感器设备的可制造性至关重要。将得到的传感器显示出高灵敏度/选择性CO 2相对于其他小气体的气体（H 2，N2，O 2和CO）具有快速（<几十秒）的响应时间和出色的可逆性，这可以与气体在纳米多孔MOF中的物理吸附密切相关。我们为MOF集成光纤平台提出了一种基于折射率的传感机制，该机制会导致基于MOF的传感层内存在的固有光吸收随与气体吸附相关的有效折射率值的增加而增大。
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