Polyphenylene sulfide paper-based sensor modified by Eu-MOF for efficient detection of Fe~(3+)

摘要

The growth of metal organic framework (MOF) nanocrystal material onto the flexible non-woven fabric is an advanced strategy to expand its practical applications. In this study, a novel polyphenylene sulfide (PPS) paperbased sensor (Eu-MOF@ALD-PPS) was designed and successfully fabricated for efficient sensing of Fe3+. The PPS non-woven fabric was first modified by atomic layer deposition (ALD) technology, and then the Eu-MOF nanocrystals can formally grow on it via hydrothermal approaches. It exhibited excellent solvent resistant (water, methanol, ethanol, DMF and acetone) and thermal stability (120 degrees C). In addition, the obtained EuMOF@ALD-PPS showed high selectivity and sensitivity in response to Fe3+ among many metal ions (Na+, K+, Zn2+, Ni+, Mg2+, Ag+, Ba2+, Ga2+, Cu2+, Gd2+, Co2+ and Fe3+). The sensing mechanism investigation revealed that the weak interactions of Fe3+ with oxygen atoms of hydroxyl and carboxylic acids protruding into the pores of MOFs quenched the luminescence of PPS paper-based sensor effectively. This study provides a promising method to fabricate flexible sensor for detection of Fe3+.