Zhou Hong, Hui Xindan, Li Dongxiao, Hu Donglin, Chen Xin, He Xianming, Gao Lingxiao, Huang He, Lee Chengkuo, Mu Xiaojing
Key Laboratory of Optoelectronic Technology & Systems Ministry of Education, and International R & D Center of Micro-Nano Systems and New Materials Technology Chongqing University Chongqing 400044 P. R. China.
Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou 215123 P. R. China.
Adv Sci (Weinh). 2020 Sep 18;7(20):2001173. doi: 10.1002/advs.202001173. eCollection 2020 Oct.
Simultaneous on-chip sensing of multiple greenhouse gases in a complex gas environment is highly desirable in industry, agriculture, and meteorology, but remains challenging due to their ultralow concentrations and mutual interference. Porous microstructure and extremely high surface areas in metal-organic frameworks (MOFs) provide both excellent adsorption selectivity and high gases affinity for multigas sensing. Herein, it is described that integrating MOFs into a multiresonant surface-enhanced infrared absorption (SEIRA) platform can overcome the shortcomings of poor selectivity in multigas sensing and enable simultaneous on-chip sensing of greenhouse gases with ultralow concentrations. The strategy leverages the near-field intensity enhancement (over 1500-fold) of multiresonant SEIRA technique and the outstanding gas selectivity and affinity of MOFs. It is experimentally demonstrated that the MOF-SEIRA platform achieves simultaneous on-chip sensing of CO and CH with fast response time (<60 s), high accuracy (CO: 1.1%, CH: 0.4%), small footprint (100 × 100 µm), and excellent linearity in wide concentration range (0-2.5 × 10 ppm). Additionally, the excellent scalability to detect more gases is explored. This work opens up exciting possibilities for the implementation of all-in-one, real-time, and on-chip multigas detection as well as provides a valuable toolkit for greenhouse gas sensing applications.
在工业、农业和气象领域，非常希望能够在复杂气体环境中同时对多种温室气体进行片上传感，但由于它们的超低浓度和相互干扰，这仍然具有挑战性。金属有机框架（MOF）中的多孔微结构和极高的表面积为多气体传感提供了出色的吸附选择性和高气体亲和力。在此描述了将MOF集成到多谐振表面增强红外吸收（SEIRA）平台中可以克服多气体传感中选择性差的缺点，并能够对超低浓度的温室气体进行同时片上传感。该策略利用了多谐振SEIRA技术的近场强度增强（超过1500倍）以及MOF出色的气体选择性和亲和力。实验证明，MOF-SEIRA平台实现了对CO和CH的同时片上传感，具有快速响应时间（<60秒）、高精度（CO：1.1%，CH：0.4%）、小尺寸（100×100微米）以及在宽浓度范围（0-2.5×10 ppm）内的出色线性度。此外，还探索了检测更多气体的出色可扩展性。这项工作为实现一体化、实时和片上多气体检测开辟了令人兴奋的可能性，并为温室气体传感应用提供了有价值的工具包。
