Metal-organic frameworks(MOFs)have been extensively used for gas sorption,storage and separation owing to ultra-high porosity,exceptional thermal stability,and wide structural diversity.However,when it comes to ultra-low concentration gas detec-tion,technical bottlenecks of MOFs appear due to the poor adsorption capacity at ppm-/ppb-level 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 CO2 detec-tion.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 CO2 sensors,including low detection limit,high sensitivity(0.18％/pppm),excellent reversibility(variation within 2％),and high selectivity(against C2H5OH,CH3OH,N2).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.

Hong Zhou;Zhihao Ren;Cheng Xu;Liangge Xu;Chengkuo Lee

Department of Electrical and Computer Engineering,National University of Singapore,Singapore 117583,Singapore;Center for Intelligent Sensors and MEMS(CISM),National University of Singapore,Singapore 117608,Singapore;NUS Suzhou Research Institute(NUSRI),Suzhou 215123,People's Republic of China

纳微快报（英文）

[1]Hong Zhou;Zhihao Ren;Cheng Xu;Liangge Xu;Chengkuo Lee-.MOF/Polymer-Integrated Multi-Hotspot Mid-Infrared Nanoantennas for Sensitive Detection of CO2 Gas)[J].纳微快报（英文）,2022(12):352-372

Hotspot,Nanoantennas,pppm

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