Wei Jianan, Yi Zhihao, Yang Liu, Zhang Ling, Yang Junchao, Qin Molin, Cao Shuya
State Key Laboratory of NBC Protection for Civilian, Beijing, China.
Anal Methods. 2024 Jul 25;16(29):4901-4916. doi: 10.1039/d4ay00764f.
A photonic crystal (PC) is an optical microstructure with an adjustable dielectric constant. The PC sensor was deemed a powerful tool for gas molecule detection due to its excellent sensitivity, stability, online use and tailorable optical performance. The detection signals are generated by monitoring the changes of the photonic band gap when the sensing behavior occurs. Recently, many efforts have been devoted to improving the PC sensor's detection performance and reducing technical costs by selecting and refining functional materials. In this case, metal-organic frameworks (MOFs) with a large specific surface, tunable structural properties and polymers with unique swelling properties have attracted increasingly attention. In this review, a systematic review of PC gas sensors based on MOFs and polymers was carried out for the first time. Firstly, the optical properties and gas sensing mechanism of PCs were briefly summarized. Secondly, a detailed discussion of the structural properties and rapid preparation methods of distributed Bragg reflectors (DBRs), opals and inverse opals (IOPCs) was presented. Thirdly, the recent advances in MOF, polymer and MOF/polymer-based PC sensors over the past few years were summarized. It should be noted that the sensitivity and selectivity enhancement strategy by appropriate material species selection, organic ligand functionalization, metal-ion doping, diverse functional material arrays, and multi-component compounding were analyzed in detail. Finally, prospects on PC gas sensors are given in terms of preparation methods, material functionalization and future applications.
光子晶体（PC）是一种具有可调介电常数的光学微结构。由于其优异的灵敏度、稳定性、在线使用性和可定制的光学性能，PC传感器被认为是气体分子检测的有力工具。检测信号是通过监测传感行为发生时光子带隙的变化而产生的。近年来，人们致力于通过选择和优化功能材料来提高PC传感器的检测性能并降低技术成本。在这种情况下，具有大比表面积、可调结构特性的金属有机框架（MOF）和具有独特溶胀特性的聚合物越来越受到关注。在本综述中，首次对基于MOF和聚合物的PC气体传感器进行了系统综述。首先，简要总结了光子晶体的光学性质和气敏机理。其次，详细讨论了分布式布拉格反射器（DBR）、蛋白石和反蛋白石（IOPC）的结构特性和快速制备方法。第三，总结了近年来MOF、聚合物和基于MOF/聚合物的PC传感器的研究进展。需要注意的是，详细分析了通过选择合适的材料种类、有机配体功能化、金属离子掺杂、多样的功能材料阵列和多组分复合来提高灵敏度和选择性的策略。最后，从制备方法、材料功能化和未来应用等方面对PC气体传感器进行了展望。
