Abstract
A potassium dititanate film nano produced in situ with high photocatalytic activity was prepared by sol-gel method using Ti(n-OC4H9)4 and CH3COOK as precursors at lower temperature. The process of crystal growth of potassium dititanate film was investigated by TG-DSC, XRD, Raman spectrum and atomic force microscopy (AFM). The photoelectrochemical response of the film was determined by electrochemical method. It is shown that the starting reaction temperature is 259°C. K2Ti2O5 nuclei are formed in the solid-state reaction stage at 414°C. The uniform compact and transparent. K2Ti2O5 nanofilm is obtained in the crystallization stage at 414 °C~600 °C. The surfaces of K2Ti2O5 particles of films are very smooth, and the crystal growth is in a preferred orientation along a crystal face of K2Ti2O5. The K2Ti2O5 film can efficiently decompose the alkylsiloxane monolayers under UV irradiation in air, the photo-catalytic activity of K2Ti2O5 film is higher than that of TiO2 film prepared by solgel method, and K2Ti2O5 film has strong photo-excitation and photo-response.
Original language | English |
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Pages (from-to) | 707-712 |
Number of pages | 6 |
Journal | Cailiao Kexue yu Gongyi/Material Science and Technology |
Volume | 17 |
Issue number | 5 |
State | Published - Oct 2009 |
Keywords
- Atomic force microscopy
- Crystal growth
- Potassium dititanate film
- Sol-gel