Preparation and characterization of metal–organic frameworks and their composite Eu2O3@[Zn2(bdc)2dabco] (ZBDh) via pulsed laser ablation in a flowing liquid

Abstract

This work reports the compounds [Zn₂(bdc)₂dabco] (ZBDh) and [Zn₂(bdc)₂dabco] (ZBDt) and their composite Eu₂O₃@[Zn₂(bdc)₂dabco] (ZBDh) synthesized by pulsed laser ablation in flowing liquid. At an appropriate reactant concentration, phase ZDBh transforms into phase ZDBt by an increase of the irradiation time from 4 to 40 min. The results show that the Eu₂O₃ nanoparticles with an average size of 3.17 nm are uniformly distributed throughout the crystal and the BET specific surface area of the composite Eu₂O₃@[Zn₂(bdc)₂dabco] (ZBDh) is 1621 m² g⁻¹, which is larger than that of compound [Zn₂(bdc)₂dabco] (ZBDh). Moreover, the composite Eu₂O₃@[Zn₂(bdc)₂dabco] (ZBDh) can emit very intense characteristic fluorescence at 613 nm of the Eu³⁺ ion under ultraviolet radiation and can be used for detecting methanol molecules in fluorescence sensing because its fluorescence intensity at 613 nm is sensitive to the content of methanol in solvent.