MOF/Polymer-Integrated Multi-Hotspot Mid-Infrared Nanoantennas for Sensitive Detection of CO_(2) Gas  

作　　者：Hong Zhou Zhihao Ren Cheng Xu Liangge Xu Chengkuo Lee 

机构地区：[1]Department of Electrical and Computer Engineering,National University of Singapore,Singapore 117583,Singapore [2]Center for Intelligent Sensors and MEMS(CISM),National University of Singapore,Singapore 117608,Singapore [3]NUS Suzhou Research Institute(NUSRI),Suzhou 215123,People’s Republic of China

出　　处：《Nano-Micro Letters》2022年第12期352-372,共21页纳微快报（英文版）

基　　金：This work is supported by the RIE Advanced Manufacturing and Engineering(AME)Programmatic Grant Project(Grant A18A5b0056,WBS:A-0005117-02-00);the Advanced Research and Technology Innovation Centre(ARTIC)Project(WBS:A-0005947-20-00);the Ministry of Education(MOE)of Singapore Tier 1 Project(WBS:A-0005138-01-00).

摘　　要：Metal-organic frameworks(MOFs)have been extensively used for gas sorption,storage and separation owing to ultrahigh porosity,exceptional thermal stability,and wide structural diversity.However,when it comes to ultra-low concentration gas detection,technical bottlenecks of MOFs appear due to the poor adsorption capacity at ppm-/ppblevel concentration and the limited sensitivity for signal transduction.Here,we present hybrid MOF-polymer physi-chemisorption mechanisms integrated with infrared(IR)nanoantennas for highly selective and ultrasensitive CO_(2) detection.To improve the adsorption capacity for trace amounts of gas molecules,MOFs are decorated with amino groups to introduce the chemisorption while maintaining the structural integrity for physisorption.Additionally,leveraging all major optimization methods,a multi-hotspot strategy is proposed to improve the sensitivity of nanoantennas by enhancing the near field and engineering the radiative and absorptive loss.As a benefit,we demonstrate the competitive advantages of our strategy against the state-of-the-art miniaturized IR CO_(2) sensors,including low detection limit,high sensitivity(0.18%/ppm),excellent reversibility(variation within 2%),and high selectivity(against C_(2)H_(5)OH,CH_(3)OH,N_(2)).This work provides valuable insights into the integration of advanced porous materials and nanophotonic devices,which can be further adopted in ultra-low concentration gas monitoring in industry and environmental applications.

关 键 词：Metal-organic framework Gas detection Mid-infrared nanoantennas Multi-hotspot Loss engineering 

分 类 号：O647.3[理学—物理化学] TN820[理学—化学]