title: High-performance photodetectors and enhanced photocatalysts of two-dimensional TiO2 nanosheets under UV light excitation.
abstract: Due to the large surface area-to-volume ratio and rapid electron transfer, two-dimensional (2D) TiO2 nanosheets with ultrathin thicknesses are synthesized by using a bottom-up strategy and these self-assembled nanosheet (NS)-based photocatalysts and photodetectors were explored for the first time. The influence of calcination temperature on microstructures and photocatalytic activity of TiO2 nanosheets were discovered and presented. The as-obtained TiO2 nanosheets were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) analysis, Fourier transform infrared (FTIR) spectroscopy, UV-vis spectrophotometry, and X-ray photoelectron spectroscopy (XPS). The following heat treatment process induced phase evolution from rutile to anatase. The TiO2 nanosheets calcined at 500 °C exhibited the best activity for photo-degradation of organic dyes under UV light irradiation. The obtained photodetector exhibits excellent performance with a high photocurrent to dark current ratio and fast response and recovery times. Additionally, we demonstrated that the device may have potential applications in the future low-power optoelectronics system.
authors.affiliation: Key Lab for Magnetism and Magnetic Materials of Ministry of Education, School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China. gaomz@lzu.edu.cn.
authors.forename: Jiao
authors.initials: J
authors.lastname: Yang
authors.affiliation: Key Lab for Magnetism and Magnetic Materials of Ministry of Education, School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China. gaomz@lzu.edu.cn.
authors.forename: Yi-Lin
authors.initials: YL
authors.lastname: Jiang
authors.affiliation: Key Lab for Magnetism and Magnetic Materials of Ministry of Education, School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China. gaomz@lzu.edu.cn.
authors.forename: Lin-Jie
authors.initials: LJ
authors.lastname: Li
authors.affiliation: Key Lab for Magnetism and Magnetic Materials of Ministry of Education, School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China. gaomz@lzu.edu.cn.
authors.forename: Elisée
authors.initials: E
authors.lastname: Muhire
authors.affiliation: Key Lab for Magnetism and Magnetic Materials of Ministry of Education, School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China. gaomz@lzu.edu.cn.
authors.forename: Mei-Zhen
authors.initials: MZ
authors.lastname: Gao