研究目的
To investigate the preparation conditions and properties of black TiO2, focusing on its photocatalytic activities under vacuum and ambient temperature environment.
研究成果
Black TiO2 prepared by laser sputtering deposition in vacuum exhibited high light absorption from UV to near-infrared but showed poor photocatalytic performance due to excess oxygen vacancies. The study highlights the importance of controlling oxygen vacancies for improving photocatalytic efficiency.
研究不足
The presence of excess oxygen defects in black TiO2 resulted in a higher recombination rate of photo electron-hole pairs, leading to poor photocatalytic performance. The study emphasizes the need for controllability and quantification of oxygen vacancies.
1：Experimental Design and Method Selection:
The study utilized the infrared nano-second laser sputtering deposition method under vacuum to prepare black TiO
2：Sample Selection and Data Sources:
Anatase TiO2 powder was pressed into a target material and subjected to laser ablation in a vacuum chamber.
3：List of Experimental Equipment and Materials:
Equipment included a pelletizer, vacuum pump, Nd:YAG pulse laser, and various characterization tools like XRD, FE-SEM, FE-TEM, XPS, etc.
4：Experimental Procedures and Operational Workflow:
The TiO2 target was irradiated by laser in a vacuum, and the products were deposited on a quartz glass substrate.
5：Data Analysis Methods:
The samples were characterized using XRD, FE-SEM, FE-TEM, XPS, UV-VIS-NIR spectrometer, and photocatalytic degradation tests.
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X-ray diffraction
D8 Advanced
Bruker
Used to characterize the phase composition of the samples.
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field emission scanning electron microscope
4800S
Hitachi
Used to study the surface morphology of the samples.
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field emission transmission electron microscope
JEM-2100F
JEOL
Applied for a high-resolution morphology analysis of the samples.
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electron spin resonance
FA-200
Jeol
Used to obtain ESR spectra at room temperature.
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UV-VIS-NIR spectrometer
U-4100
Hitachi
Used to measure the optical absorption of the samples.
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pelletizer
FW-5A
Botian Shengda Science and Technology Development Co. Ltd
Used to press TiO2 powder into a circular target material.
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vacuum pump
TRP-36
Beiyi woosung vacuum technology Co. LTD
Used to generate vacuum inside the experimental chamber.
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Nd:YAG pulse laser
Beamtech Nimma 900
Used for laser ablation sputtering of the TiO2 target material.
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X-ray photoelectron spectroscopy
PHL1600ESCA
Ulvac-Phi
Used to measure the element valence and variation of the sample valence bands.
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steady-state spectrofluorometric
Jobin Yvon Fluorolog3
Used to measure the luminous performance of the samples.
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Fourier transform infrared spectrometer
Nicolet is10
Used to characterize the functional group on the sample surface.
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electrochemical working station
Gamry Reference 1000
Used to measure the Mott-Schottky curves, and for the quantitative analysis of free carrier changes in the samples.
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