Coutino-Gonzalez Eduardo, Baekelant Wouter, Dieu Bjorn, Roeffaers Maarten B J, Hofkens Johan
Division of Molecular Imaging and Photonics, Department of Chemistry, KU Leuven.
Centre for Surface Chemistry and Catalysis, Department of Microbial and Molecular Systems, KU Leuven.
J Vis Exp. 2016 Nov 15(117):54674. doi: 10.3791/54674.
Small silver clusters confined inside zeolite matrices have recently emerged as a novel type of highly luminescent materials. Their emission has high external quantum efficiencies (EQE) and spans the whole visible spectrum. It has been recently reported that the UV excited luminescence of partially Li-exchanged sodium Linde type A zeolites [LTA(Na)] containing luminescent silver clusters can be controlled by adjusting the water content of the zeolite. These samples showed a dynamic change in their emission color from blue to green and yellow upon an increase of the hydration level of the zeolite, showing the great potential that these materials can have as luminescence-based humidity sensors at the macro and micro scale. Here, we describe the detailed procedure to fabricate a humidity sensor prototype using silver-exchanged zeolite composites. The sensor is produced by suspending the luminescent Ag-zeolites in an aqueous solution of polyethylenimine (PEI) to subsequently deposit a film of the material onto a quartz plate. The coated plate is subjected to several hydration/dehydration cycles to show the functionality of the sensing film.
最近，限制在沸石基质内的小银簇已成为一种新型的高发光材料。它们的发射具有高的外量子效率（EQE），并覆盖整个可见光谱。最近有报道称，含有发光银簇的部分锂交换钠A型沸石[LTA(Na)]的紫外激发发光可以通过调节沸石的含水量来控制。随着沸石水合水平的增加，这些样品的发射颜色从蓝色动态变化为绿色和黄色，显示出这些材料作为宏观和微观尺度上基于发光的湿度传感器的巨大潜力。在此，我们描述了使用银交换沸石复合材料制造湿度传感器原型的详细过程。该传感器是通过将发光的Ag沸石悬浮在聚乙烯亚胺（PEI）水溶液中，随后将该材料的薄膜沉积到石英板上制成的。对涂覆的板进行几个水合/脱水循环以展示传感膜的功能。
