A luminescent metal-organic framework film fabricated on porous Al 2 O 3 substrate for sensitive detecting ammonia

• DOI: 10.1016/j.micromeso.2017.06.053
• Publication Date: 2017-07-01T11:32:11Z
• Authors: Jun Zhang; Dan Yue; Tifeng Xia; Yuanjing Cui; Yu Yang; Guodong Qian
• Keywords: 01 natural sciences; 7. Clean energy; 0104 chemical sciences

Abstract A novel metal-organic framework film MIL-124 film was prepared on porous α-Al2O3 ceramic plate by in situ synthesizing. After introducing Eu3+ ions to the free -COOH sites of the MIL-124 ligand channels, a luminescent MOF film MIL-124@Eu3+ was obtained. Based on the chemical reaction between NH3 and the -COOH, the formation of -COONH4 which was demonstrated by FT-IR spectrum, affected the energy transfer between Eu3+ ions and ligand, quenching the characteristic emission of MIL-124@Eu3+ film. The limit of detection to ammonia was calculated as 26.2 ppm in ambient air. The XRD results demonstrated the long-term stability of this ammonia sensor. The excellent performance and economical synthesizing strategy of the MIL-124@Eu3+ film exhibited potential application of this sensor for detecting ammonia gas.