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The method leverages the near-field power improvement (over 1500-fold) of multiresonant SEIRA technique and the outstanding gas selectivity and affinity of MOFs. It's experimentally demonstrated that the MOF-SEIRA system achieves simultaneous on-chip sensing of CO2 and CH4 with fast reaction time ( less then 60 s), large accuracy (CO2 1.1%, CH4 0.4%), tiny footprint (100 × 100 µm2), and exemplary linearity in broad concentration range (0-2.5 × 104 ppm). Furthermore, the superb scalability to identify eve