Metal-organic framework-derived oxygen-rich vacancies and porous TiO2 nanotablets for hydrogen detection with high response at room temperature

Abstract

In this work, porous TiO2 nanotablets with rich oxygen vacancies were synthesized by thermal decomposition of MIL-125, and their hydrogen gas sensing performance has been investigated for the first time. In comparison with TiO2 microparticles prepared by the traditional sol-gel method, the metal-organic framework-derived porous TiO2 nanotablets have a larger specific surface area and oxygen vacancies, which can significantly boost hydrogen at room temperature. Furthermore, the gas-sensing mechanism of the MOFs-derived TiO2 nanotablets is well unraveled by experimental results and density functional theory (DFT) calculations. This study would provide a new perspective on TiO2-based nanomaterials for hydrogen detecting at room temperature.