Photoelectric properties of composite materials based on ultrathin porphyrin-based 2D lanthanide MOF nanosheets grown on TiO2 nanowire arrays through epitaxial growth

Ultrathin Two-dimensional (2D) metal-organic framework (MOF) nanosheets have attracted the attention of researchers because of large specific surface area, and TiO2 nanowire arrays based on semiconductor materials can utilize solar energy and have broad application prospects in the energy and environmental fields. In this paper, needle-shaped TiO2 (n type) nanowire arrays are synthesized through the optimization and control of reaction conditions, and stable TiO2 nanowire arrays are obtained with a diameter of about 10-20 nm and a length of about 4-5 μm. In addition, through the improvement of solvothermal synthesis, 2D ultrathin Eu-TCPP MOF nanosheets (p type) are synthesized, with a thickness of 1.25 nm and ultrathin nanosheets with an area of more than 20 μm2. Through the compounding of the two materials, a new composite material (TiO2@Eu-TCPP nanowire arrays) was obtained, and the Photoelectric properties are 140 times higher than the original two materials, response time is within 2s, due to the semiconductor p-n heterojunction effect.