Coating of Conducting and Insulating Threads with Porous MOF Particles through Langmuir-Blodgett Technique

Abstract

The Langmuir-Blodgett (LB) method is a well-known deposition technique for the fabrication of ordered monolayer and multilayer thin films of nanomaterials onto different substrates that plays a critical role in the development of functional devices for various applications. This paper describes detailed studies about the best coating configuration for nanoparticles of a porous metal-organic framework (MOF) onto both insulating or conductive threads and nylon fiber. We design and fabricate customized polymethylmethacrylate sheets (PMMA) holders to deposit MOF layers onto the threads or fiber using the LB technique. Two different orientations, namely, horizontal and vertical, are used to deposit MIL-96(Al) monolayer films onto five different types of threads and nylon fiber. These studies show that LB film formation strongly depends on deposition orientation and the type of threads or fiber. Among all the samples tested, cotton thread and nylon fiber with vertical deposition show more homogenous monolayer coverage. In the case of conductive threads, the MOF particles tend to aggregate between the conductive thread’s fibers instead of forming a continuous monolayer coating. Our results show a significant contribution in terms of MOF monolayer deposition onto single fiber and threads that will contribute to the fabrication of single fiber or thread-based devices in the future.

Recent progress on MOF-based optical sensors for VOC sensing

“…86 The choice of MOF candidates that can be adopted via this approach are with less limitations, even including high-valence metal based MOFs such as MIL-101(Cr), MIL-96(Al) and UiO-66. [88][89][90][91][92] The quality of the resulting lms highly depends on the homogeneity of the MOF suspension, where the choice of the dispersant and surfactant can be crucial. 89,90 In this strategy, the MOF suspensions are deposited onto at substrates, aer which solvent evaporates leading to uniform and polycrystalline lms.…”

“…In a recent study, Rauf et al reported a homogenous coating of MIL-96(Al) monolayer thin films onto conductive and insulating polymer threads, evidencing the applicability of this approach to a wide choice of substrates. 91 The deposited films possess the hierarchical microporosity from the MOF and additional meso- to macro-porosity from assembled MOF particles. 40 Moreover, the film thickness is often controllable by tuning the particle size of deployed MOFs, the concentration and viscosity of the MOF suspension, as well as deposition parameters ( e.g.…”

Hybrid Porous Nanomaterials for Energy and Environment

“…In this study, by Rauf et al, customized polymethylmethacrylate sheets (PMMA) holders to deposit MOF layers onto the threads or fiber using the LB technique were designed and fabricated. The results demonstrate a significant contribution in terms of MOF monolayer deposition onto single fiber and threads that will contribute to the fabrication of single fiber or thread-based devices in the future [ 1 ].…”