结合多种发光MOF和超顺磁性微粒的复合材料，用于按比例检测水,Journal of Materials Chemistry C

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结合多种发光MOF和超顺磁性微粒的复合材料，用于按比例检测水
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2017-08-30 00:00:00 , DOI: 10.1039/c7tc03312e
T. Wehner _{1,

2,

3,

4} , M. T. Seuffert _{1,

2,

3,

4} , J. R. Sorg _{1,

2,

3,

4} , M. Schneider _{4,

5,

6,

7} , K. Mandel _{4,

5,

6,

7} , G. Sextl _{4,

5,

6,

7,

8} , K. Müller-Buschbaum _{1,

2,

3,

4}

Affiliation

已经开发出适用于比率传感应用和收获方案的智能光学复合材料。杂化材料由以Fe ₃ O ₄ / SiO ₂为核的核/壳颗粒和作为壳的不同含发光镧系元素的金属-有机骨架（MOF）组成。磁性使得能够经由外部磁场收集微粒，并因此增强了发光信号的信号增强。因此，MOF发光用作感测的读出信号，该信号可能会受到不同化合物的影响，例如用低浓度的水淬灭。MOF的组合包含不同的发光中心，并且对水的敏感性不同，因此可以将其用作比率传感器。我们已经利用的MOF ³_∞ [欧盟₂（BDC）₃ ]·2H ₂ O·2DMF（BDC ^2- =苯二羧酸酯）和²_∞ [LN ₂氯₆（联吡啶）₃ ]·2bipy（LN =铕，铽; bipy = 4,4'-bipyridine）使微粒功能化，从而产生与Fe ₃ O ₄ / SiO一起颜色可调的发黄光混合MOF复合体系₂芯。与水的相互作用使两个发光中心的发光均等地降低，这使得能够通过分析Tb³⁺和Eu³⁺发光带的比率来定量确定水含量。通过复合物的超顺磁性的可能收获来支持该过程。总共获得了0.3％（20μg）的检出限的高灵敏度，与Karl-Fischer滴定法相同，但也适用于“即时”分析。

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Composite materials combining multiple luminescent MOFs and superparamagnetic microparticles for ratiometric water detection

Smart optical composite materials suitable for ratiometric sensing applications and harvesting options have been developed. The hybrid materials consist of core/shell particles with Fe₃O₄/SiO₂ as the core and different luminescent lanthanide-containing metal–organic frameworks (MOFs) as the shell. The magnetic properties enable collection of microparticles via an external magnetic field and, thus, a strong signal augmentation of the luminescence signal. Thereby, MOF luminescence functions as a read-out signal of the sensing that can be influenced by different chemical compounds, e.g. by quenching with low concentrations of water. The combination of MOFs, which contain different luminescence centers combined with a different sensitivity towards water, results in a system that can be exploited as a ratiometric sensor. We have utilized the MOFs ³_∞[Eu₂(BDC)₃]·2H₂O·2DMF (BDC²⁻ = benzene dicarboxylate) and ²_∞[Ln₂Cl₆(bipy)₃]·2bipy (Ln = Eu, Tb; bipy = 4,4′-bipyridine) for functionalization of the microparticles, resulting in a color-tuned yellow-emitting mixed-MOF composite system together with a Fe₃O₄/SiO₂ core. Interaction with water decreases the luminescence unequally for both luminescence centers, which enables a quantitative determination of the water content by analysis of the ratio of the Tb³⁺ and Eu³⁺ luminescence bands. This process is supported by possible harvesting via superparamagnetism of the composite. Altogether, high sensitivity with a detection limit of 0.3% (20 μg) is achieved, equal to Karl-Fischer titration but also suitable for an “on-the-fly” analysis.

更新日期：2017-09-13

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