The impact of Activation on the Performance of Optical Oxygen Sensing with the Luminescent Metal-Organic Framework MOF-76(Eu)

被引：1
作者：
Kasper, Thomas [1 ]
Burkhart, Julian [1 ]
Mueller-Buschbaum, Klaus [1 ,2 ]
机构：
[1] Justus Liebig Univ, Inst Inorgan & Analyt Chem, Heinrich Buff Ring 17, D-35392 Giessen, Germany
[2] Justus Liebig Univ, Ctr Mat Res LAMA, Heinrich Buff Ring 16, D-35392 Giessen, Germany
来源：
CHEMPHOTOCHEM | 2024年 / 8卷 / 08期
关键词：
oxygen sensing; metal-organic frameworks; luminescence; optical sensing; activation; COORDINATION POLYMERS; GAS SENSOR; BLUE; O-2; XRD;
D O I：
10.1002/cptc.202300329
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The influence of activation as key parameter for oxygen sensing by luminescent metal-organic frameworks has been investigated and quantified for the archetype MOF-76(Eu). Activation at different conditions (regarding temperature and solvent-exchange for distinct vacuum pressure and heating time), shows an influence on the overall quenching, response time and cyclability due to different pore accessibility and surface area and therefore on the overall performance of the sensor. The optical sensing process is based on luminescence quenching, analyzed from high vacuum (10-7 bar) to ambient pressure by dosing oxygen from 0.01 bar to 1 bar. Strong influence of the different activation parameters is observed, as MOF-76(Eu) activated at 50 degrees C shows limited quenching of the luminescence intensity within 30 min, while methanol-exchange and subsequent activation at 250 degrees C leads to a quenching rate of 98.6 %. In addition, the sensor response occurs more than 1000 times faster within 0.2 s. These results correlate well with physisorption data, which reveal a significant change in porosity and surface area according to the degree of activation. For a better understanding of the involved processes, adsorption isotherms were recorded, surface areas determined and correlated to the photophysical parameters, including Stern-Volmer kinetics and cycling experiments for the differently activated MOF sensors. Investigation on the influence of different activation parameters for the performance of MOF-76(Eu) for luminescent oxygen sensing showed that activation is essential to utilize the full potential of optical sensing regarding both, sensitivity by degree of quenching as well as response time of the sensor. image
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页数：12
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