研究目的
To investigate the feasibility of modifying the absorption properties of TiO2 by irradiating TiO2 nanoparticles with femtosecond laser filament in both an ambient air and a solution environment.
研究成果
The study demonstrates that femtosecond laser filamentation can effectively engineer black TiO2 with enhanced absorption across a broad spectral range, from visible to infrared and even microwave. The absorption enhancement is attributed to filament-induced disorder and dopant impurity in the surface layer of crystalline TiO2. This technique offers a promising approach for applications in optoelectronics and photochemistry.
研究不足
The study does not explore the long-term stability of the engineered black TiO2 under operational conditions. Additionally, the scalability of the femtosecond laser filamentation technique for large-scale production is not addressed.
1：Experimental Design and Method Selection:
The study utilized femtosecond laser filamentation to modify the surface properties of TiO2 nanoparticles. The laser pulses were propagated in the filamentation region in air to achieve black TiO
2：Sample Selection and Data Sources:
Anatase TiO2 nanoparticles with sizes of 70-100 nm were used. The samples were processed in both solution and air environments.
3：List of Experimental Equipment and Materials:
A commercial Ti: Sapphire laser system (Spectra-Physics, Spitfire ACE) was used to produce femtosecond laser pulses. Other equipment included a spectrophotometer (UV-3600, Shimadzu Company), a Raman spectrometer (LabRAM HR Evolution by Horriba Scientific), and an energy dispersive spectrometer (EDS, EDAX AMETEK).
4：Experimental Procedures and Operational Workflow:
The TiO2 nanoparticles were irradiated with femtosecond laser filament in solution and air conditions. The optical, structural, and elemental properties of the processed samples were then characterized.
5：Data Analysis Methods:
The optical properties were analyzed using UV-visible-NIR reflection spectra and microwave reflection loss values. Structural changes were examined using Raman and XRD spectra, and elemental composition was analyzed using EDS.
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