Metal-organic framework functionalized polymer coating for fiber optical methane sensors
Metal-organic framework functionalized polymer coating for fiber optical methane sensors
复制标题
DOI：
10.1016/j.snb.2020.128627
复制
发表时间：
2020-12-01
影响因子：
8.4
通讯作者：
Chen, Kevin P.
中科院分区：
文献类型：
--
作者：
Cao, Rongtao;Ding, Hangjun;Chen, Kevin P.
功能聚合物涂层与光纤的集成是一种有趣的方法，以开发低成本的点和分布式光纤传感器的大规模应用。本文介绍了通过应用聚合物/纳米晶金属有机框架（MOFs）复合材料作为甲烷传感器监测天然气基础设施的单模和多模光纤的气敏涂层的发展。具有优化的光学和机械性能的基于PDMS的有机硅聚合物被开发作为众所周知的金属有机框架ZIF-8的主体材料。ZIF-8纳米晶体在PDMS聚合物内的整合改变了材料的物理性质，并导致所得膜的CH 4溶解度和渗透性的增强。通过调节ZIF-8/聚合物重量比优化ZIF-8官能化聚合物的折射率、粘度和机械性能，并随后用作纤维涂层。涂覆有MOF官能化聚合物的多模和单模光纤在暴露于N-2载气中的各种浓度的CH 4时显示出传输功率的成比例变化。通过光纤的传输功率的变化是由于在CH 4吸附时聚合物包层折射率的变化引起的与传感器涂层的倏逝波相互作用的变化的结果。使用多模光纤和D形单模光纤实现了氮气中1%的甲烷检测限。总的来说，我们的论文提出了一种低成本的方法来执行点和分布式传感CH 4通过功能聚合物材料集成在光纤传感器平台上的创新方法。
Functional polymer coating integrated with optical fiber is an intriguing approach to develop low-cost point and distributed fiber sensors for large-scale applications. This paper presents the development of gas-sensitive coatings for both single-mode and multi-mode optical fibers through the application of polymer/nanocrystalline metal-organic frameworks (MOFs) composites as methane sensors for monitoring natural gas infrastructure. Silicone polymers based on PDMS with optimized optical and mechanical properties were developed as host materials for the well-known metal organic framework ZIF-8. Integration of ZIF-8 nanocrystals within the PDMS polymer modified the physical properties of the material and led to an enhancement of the CH4 solubility and permeability of the resulting film. The refractive indices, viscosities, and mechanical properties of the ZIF-8 functionalized polymers were optimized by adjusting the ZIF-8/polymer weight ratio and subsequently used as the fiber coating. Both multi-mode and single-mode optical fibers coated with the MOF-functionalized polymers showed scaled changes in transmitted power upon exposure to various concentration of CH4 in a N-2 carrier gas. The variations in transmitted power through the fiber were the result of changes in evanescent wave interactions with the sensor coating due to shifts in the polymer cladding refractive index upon CH4 sorption. A methane detection limit of 1 % in nitrogen was achieved using both multimode fiber and D-shaped single mode fibers. Overall, our paper presents a low-cost approach to perform point and distributed sensing for CH4 through an innovative method of functional polymer material integration on optical fiber sensor platforms.