Development of Wide Bandgap One-dimensional MOF/TiO2 Photonic Crystal and Its Gas-sensing Properties

Abstract

Metal-organic framework (MOFs) materials are a type of coordination polymer that have seen significant breakthroughs in material science over the past decade. Because of their high specific surface area and porosity, they are widely used for gas adsorption, storage, and separation. Additionally, their structural tunability allows for a wide variety of MOFs, with more remarkable properties yet to be discovered as research continues. When MOFs are applied in photonic crystals, adjustments to their structure enable them to act as specific gas-sensitive materials, causing shifts in the photonic crystal's forbidden band after gas adsorption. This generates distinguishable signals for effective sensing. In conventional single-metal MOFs, doping with another metal to prepare photonic crystals increases defect size while reducing symmetry and simplicity, leading to more pronounced forbidden bands and improved sensing. Therefore, in this thesis, we aim to partially replace the chromium in MIL-101 with magnesium and then self-assemble it with titanium dioxide to prepare photonic crystals. This approach aims to leverage the exceptional properties of MOFs, resulting in photonic crystals with improved gas-specific recognition and sensitivity, further enhancing their gas-sensing capabilities.