Ultrasmall Metal–Organic Framework Zn-MOF-74 Nanodots: Size-Controlled Synthesis and Application for Highly Selective Colorimetric Sensing of Iron(III) in Aqueous Solution

摘要: Here, a novel colorimetric sensing platform for highly selective detection of Fe3+ in aqueous solutions was developed based on zero-dimensional Zn-MOF-74 [Zn2(DOBDC), DOBDC = 2,5-dihydroxyterephthalic acid] nanodots. The first ultrasmall nanodots with the average size within 10 nm were successfully synthesized by manipulating initial conditions diluted material system. It found that ultrasamll MOF had interaction and showed specific blue change solution. dispersive nature solution high surface-to-volume ratio help MOF-74 closely interact targeted ions low limit 1.04 μM fast response seconds. Finally, we demonstrate mechanism is due to framework disruption formation Fe-DOBDC salt complex color. report nanoscale colo...