4.8 Article

Fast Dynamic Synthesis of MIL-68(In) Thin Films in High Optical Quality for Optical Cavity Sensing

期刊

ACS NANO
卷 17, 期 6, 页码 6121-6130

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsnano.3c01558

关键词

Metal-Organic Frameworks; Thin Film Deposition; Optical Quality SURMOF; Resonating Cavity; MOF Gas Sensor

向作者/读者索取更多资源

The fabrication of metal-organic framework (MOF) thin films is essential for integrating these materials into electronic and optical devices. However, the limited structural variety of MOF thin films prepared through layer-by-layer deposition has been a challenge. In this study, a fast method for the preparation of MIL SURMOF on Au-surfaces was developed, allowing for the deposition of adjustable thickness thin films within 60 minutes. The resulting MIL-68(In) thin films showed high optical quality and mechanical properties, making them suitable for use as optical read-out sensors.
Fabrication of metal-organic framework (MOF) thin films rigidly anchored on suitable substrates is a crucial prerequisite for the integration of these porous hybrid materials into electronic and optical devices. Thus, far, the structural variety for MOF thin films available through layer-by-layer deposition was limited, as the preparation of those surface-anchored metal- organic frameworks (SURMOFs) has several requirements: mild conditions, low temperatures, day-long reaction times, and nonaggressive solvents. We herein present a fast method for the preparation of the MIL SURMOF on Au-surfaces under rather harsh conditions: Using a dynamic layer-by-layer synthesis for MIL-68(In), thin films of adjustable thickness between 50 and 2000 nm could be deposited within only 60 min. The MIL-68(In) thin film growth was monitored in situ using a quartz crystal microbalance. In-plane X-ray diffraction revealed oriented MIL-68(In) growth with the pore-channels of this interesting MOF aligned parallel to the support. Scanning electron microscopy data demonstrated an extraordinarily low roughness of the MIL-68(In) thin films. Mechanical properties and lateral homogeneity of the layer were probed through nanoindentation. These thin films showed extremely high optical quality. By applying a poly(methyl methacrylate) layer and further depositing an Au-mirror to the top, a MOF optical cavity was fabricated that can be used as a Fabry-Perot interferometer. The MIL-68(In)-based cavity showed a series of sharp resonances in the ultraviolet-visible regime. Changes in the refractive index of MIL-68(In) caused by exposure to volatile compounds led to pronounced position shifts of the resonances. Thus, these cavities are well suited to be used as optical read-out sensors.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.8
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据