Synthesis and self-assembly of metal-organic frameworks [thesis]

Chenlong Cui
Metal-organic frameworks (MOFs), also known as porous coordination polymer(PCPs), are organic-inorganic compounds which are self-assembled from metal ions/clusters with organic ligands attaining permanent pores, ultrahigh surface area and infinite structure tailorability. These unique properties have rendered MOFs as great candidates in gas adsorption and separation, catalysis, sensing, drug delivery, etc. Structural control over both the molecular level and particle level is believed to be an
more » ... believed to be an efficient way for both creating new properties and enhancing the current performance of MOFs. To further developing the properties of MOFs, MOFs particles were modified through various techniques to achieve the goal above. Techniques, including self-assembly, were applied to make structure based new or enhanced properties of MOFs. For the first part of this thesis, a route for the synthesis of monodispersed MOFs particles was developed and the MOFs particles were further assembled to large area 2D/3D-ordered structures. A photonic sensor based on self-assembled MOF particles was fabricated. Control over size and shape of MOFs particles is important in the synthesis of MOFs. However, synthesis of monodispersed MOFs particles is still not well understood. At the same time, monodispersed particles are excellent building blocks for superstructures in bottom-up routes. This lack of monodispersed MOFs particles has hindered research on self-assembled MOF superstructures, preventing researchers from developing and studying possible, novel properties of MOFs. Herein, we chose acetic acid as the modulator for the synthesis of monodispersed MOFs. These monodispersed MOFs particles were further self-assembled into 2D/3D superstructures. Also, a photonic sensor was fabricated based on the superstructure using the Langmuir-Blodgett method. The sensor responds to various hazard gas vapors, allowing people to differentiate between the vapors simply by sight. Furthermore, as a representative method of a bottom-up strategy, self-assembly has few requirements for equipment and time, making the entire process of fabrication more convenient and low-cost.
doi:10.32657/10356/69838 fatcat:54r3j7c2sza5xavcivfg5y5se4