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In this paper, a dual-ligand design strategy is demonstrated to modulate the performance of the electronically conductive metal-organic frameworks (EC-MOFs) thin film with a spray layer-by-layer assembly method. The thin film not only can be precisely prepared in nanometer scale (20-70 nm), but also shows the pin-hole-free smooth surface. The high quality nano-film of 2,3,6,7,10,11-hexaiminotriphenylene (HITP) doped Cu-HHTP enables the precise modulation of the chemiresistive sensitivity and selectivity. Selectivity improvement over 220% were realized for benzene vs. NH3, as well as enhanced response and recovery properties. In addition, the selectivity of the EC-MOF thin film sensors toward other gases (e.g. triethylamine, methane, ethylbenzene, hydrogen, butanone, and acetone) vs. NH3 at room temperature is also discussed.
This research was supported by the National Natural Science Foundation of China (Nos. 21801243, 21822109, 21975254, 21773245, 21850410462, and 21805276), the Key Research Program of Frontier Science, CAS (No. QYZDB-SSW-SLH023), China Postdoctoral Science Foundation (Nos. 2018M642576 and 2018M642578), International Partnership Program of CAS (No. 121835KYSB201800), the Natural Science Foundation of Fujian Province (No. 2019J01129), and the Youth Innovation Promotion Association CAS.