Lanthanide functionalized MOFs thin films as effective luminescent materials and chemical sensor for ammonia
In this work, a series of transparent luminescent MOFs thin films are designed and prepared by assembling the lanthanide functionalized UiO-67 (Ln(TTA/TAA)@UMOF, Ln = Eu, Tb, Er, Nd, TTA = 2-thenoyltrifluoroacetone, TAA = 1,1,1-trifluoropentane-2,4-dione) on the organosilane linker (L) modified Al2O3 (A) using lanthanide ions as the bridge. Notably, the Ln(TTA/TAA)@UMOF is synthesized by introducing lanthanide ions and TTA/TAA into the framework of UMOF via a facial and non-destructive post-synthesis modification(PSM) strategy. Because there are multiple antennas including L, the ligand of UMOF, β-diketone (TTA/TAA) transferring energy to lanthanide ions, these thin films exhibit excellent luminescent properties. Interestedly, the Eu@UMOF-Eu-LA film can selectively recognize ammonia without the interference of other indoor polluted gases. Further investigation reveals the Eu@UMOF-Eu-LA film sensor has superior performances including quick response, outstanding selectivity and high sensitivity (LOD = 9 ppm) towards ammonia. These results illustrate the Eu@UMOF-Eu-LA film has enormous potential to detect ammonia practically.