High-performance photodetectors and enhanced photocatalysts of two-dimensional TiO2nanosheets under UV light excitation
- 17 March 2016
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Nanoscale
- Vol. 8 (15), 8170-8177
- https://doi.org/10.1039/c5nr09248e
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.Keywords
Funding Information
- National Natural Science Foundation of China (51371093)
This publication has 38 references indexed in Scilit:
- A self-powered UV photodetector based on TiO2 nanorod arraysNanoscale Research Letters, 2013
- Hetero-nanostructured film of titania nanosheets and lysozyme: Fabrication and synergistic antibacterial propertiesSurface and Coatings Technology, 2012
- Synthesis and electrochemical properties of a porous titania fabricated from exfoliated nanosheetsJournal of Power Sources, 2011
- First-principles study of zinc oxide honeycomb structuresPhysical Review B, 2009
- Enhanced Photoactivity of Oxygen-Deficient Anatase TiO2 Sheets with Dominant {001} FacetsThe Journal of Physical Chemistry C, 2009
- The Role of Interstitial Sites in the Ti 3d Defect State in the Band Gap of TitaniaScience, 2008
- Anatase TiO2 single crystals with a large percentage of reactive facetsNature, 2008
- Effects of pH on the microstructures and photocatalytic activity of mesoporous nanocrystalline titania powders prepared via hydrothermal methodJournal of Molecular Catalysis A: Chemical, 2006
- Titania Nanostructured Films Derived from a Titania Nanosheet/Polycation Multilayer Assembly via Heat Treatment and UV IrradiationChemistry of Materials, 2002
- Photooxidative N-demethylation of methylene blue in aqueous TiO2 dispersions under UV irradiationJournal of Photochemistry and Photobiology A: Chemistry, 2001