Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen 76344, Germany.
Tata Institute of Fundamental Research, Gopanpally, Hyderabad, Telangana 500046, India.
ACS Appl Mater Interfaces. 2023 Apr 19;15(15):19665-19671. doi: 10.1021/acsami.3c00860. Epub 2023 Mar 16.
Easy-to-integrate, remote read-out thermometers with fast response are of huge interest in numerous application fields. In the context of optical read-out devices, sensors based on the emission of lanthanides (Eu(III), Tb(III)) are particularly promising. Here, by using a layer-by-layer (LbL) approach in the liquid-phase epitaxy process, a series of continuous, low-thickness lanthanide-MIL-103 SURMOFs were fabricated to yield highly sensitive thermometers with optical readout. These Ln-SURMOFs exhibit remarkable temperature-sensing photoluminescence behavior, which can be read out using the naked eye. High transmittance is realized as well by precisely controlling the film thickness and the quality of these Ln-SURMOF thermometers. Moreover, we demonstrate that the thermal sensitivity can be improved in the temperature regime above 120 K, by controlling the energy transfer between Tb(III) and Eu(III). This performance is achieved by employing a sophisticated supramolecular architecture, namely MOF-on-MOF heteroepitaxy.
在众多应用领域中，易于集成、快速响应的远程读取温度计具有巨大的应用价值。在光学读取设备方面，基于镧系元素（Eu(III)、Tb(III)）发射的传感器具有广阔的应用前景。在此，通过在液相外延过程中使用层层（LbL）方法，制备了一系列连续的、低厚度的镧系元素-MIL-103 SURMOF，以获得具有光学读取功能的高灵敏度温度计。这些 Ln-SURMOF 表现出显著的温度感应光致发光行为，可通过肉眼读取。通过精确控制薄膜厚度和 Ln-SURMOF 温度计的质量，实现了高透光率。此外，我们还证明通过控制 Tb(III)和 Eu(III)之间的能量转移，可以在 120 K 以上的温度范围内提高热灵敏度。这种性能是通过采用复杂的超分子架构，即 MOF-on-MOF 异质外延来实现的。
