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Vapochromic behavior of MOF for selective sensing of ethanol
1School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331, China.
Abstract:
A MOF material, Co3[Co(CN)6]2 nanoparticles has been prepared for the effective detection of ethanol in vapor phase. When exposed to ethanol vapor, the material was changed from pink to purple, which is easily observed by naked eyes directly. We propose that the ethanol response is due to ethanol molecules entering the pores of the solid, where they alter the coordination geometry, leading to conversion of their Co centers from octahedral to tetrahedral coordination. Significantly, the change is reversible, which make the material reusable without subjecting to dynamic vacuum or slightly warming.
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