Layer-by-layer assembled dual-ligand conductive MOF nano-films with modulated chemiresistive sensitivity and selectivity

• Published in: Nano research Vol. 14; no. 2; pp. 438 - 443
• Main Authors: Wu, Ai-Qian, Wang, Wen-Qing, Zhan, Hong-Bin, Cao, Lin-An, Ye, Xiao-Liang, Zheng, Jia-Jia, Kumar, Pendyala Naresh, Chiranjeevulu, Kashi, Deng, Wei-Hua, Wang, Guan-E, Yao, Ming-Shui, Xu, Gang
• Format: Journal Article
• Language: English
• Published: Beijing Tsinghua University Press 01.02.2021
• Subjects: Acetone; Ammonia; Atomic/Molecular Structure and Spectra; Benzene; Biomedicine; Biotechnology; Chemistry and Materials Science; Condensed Matter Physics; Copper; Ethylbenzene; Gases; Ligands; Materials Science; Metal-organic frameworks; Nanotechnology; Research Article; Room temperature; Selectivity; Sensitivity; Thin films; Triethylamine; dual-ligand; electronic conductivity; gas sensors; metal-organic frameworks; thin films
• ISSN: 1998-0124; 1998-0000
• DOI: 10.1007/s12274-020-2823-8

In this paper, a dual-ligand design strategy is demonstrated to modulate the performance of the electronically conductive metalorganic 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. NH 3 , 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. NH 3 at room temperature is also discussed.