Gas transport regulation in a MO/MOF interface for enhanced selective gas detection

• Published in: Journal of materials chemistry. A, Materials for energy and sustainability Vol. 7; no. 31; pp. 18397 - 1843
• Main Authors: Yao, Ming-Shui, Cao, Lin-An, Tang, Yong-Xiang, Wang, Guan-E, Liu, Rui-Heng, Kumar, P. Naresh, Wu, Guo-Dong, Deng, Wei-Hua, Hong, Wen-Jing, Xu, Gang
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 2019
• Subjects: Acetone; Benzene; chemistry; coordination polymers; Detection; Gas transport; Metal oxides; Metal-organic frameworks; Nanotechnology; Nanowires; Organic chemistry; Oxides; Pore size; Porosity; Protein transport; Selectivity; Sheaths; traffic
• ISSN: 2050-7488; 2050-7496; 2050-7496
• DOI: 10.1039/c9ta05226g

The important application of metal oxides (MOs) as a chemiresistive sensing material can be severely hampered by their poor selectivity towards analyte molecules that possess a similar sensing activity. In this work, a new metal oxide@metalorganic framework (MO@MOF) coresheath nanowire array material was prepared. Using a post-synthetic modification of the pore size in the MOF sheath, the channel traffic of the analyte molecules with a similar sensing activity but different kinetic diameter was successfully modulated, which profoundly enhanced the selectivity of the MOs. As a result, the materials obtained showed the highest selective response to acetone in the presence of benzene in all the reported materials. The channel traffic of gas molecules with a similar sensing activity was modulated in MO@MOF chemiresistors by modification of the pores of the MOF sheath.