Superparamagnetic Luminescent MOF@Fe3O4/SiO2 Composite Particles for Signal Augmentation by Magnetic Harvesting as Potential Water Detectors

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• 作者：Tobias Wehner ; Karl Mandel ; Michael Schneider ; Gerhard Sextl ; Klaus Müller-Buschbaum
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：March 2, 2016
• 年：2016
• 卷：8
• 期：8
• 页码：5445-5452
• 全文大小：570K
• ISSN：1944-8252

文摘

Herein, we present the generation of a novel complex particle system consisting of superparamagnetic Fe₃O₄/SiO₂ composite microparticle cores, coated with luminescent metal–organic frameworks (MOFs) of the constitution _∞²[Ln₂Cl₆(bipy)₃]·2bipy (bipy = 4,4′-bipyridine) that was achieved by intriguing reaction conditions including mechanochemistry. The novel composites combine the properties of both constituents: superparamagnetism and luminescence. The magnetic properties can be exploited to magnetically collect the particles from dispersions in fluids and, by gathering them at one spot, to augment the luminescence originating from the MOF modification on the particles. The luminescence can be influenced by chemical compounds, e.g., by quenching observed for low concentrations of water. Thus, the new composite systems present an innovative concept of property combination that can be potentially used for the detection of water traces in organic solvents as a magnetically augmentable, luminescent water detector.