研究目的
Investigating the control of spectral light absorption in femtosecond laser-treated metals for applications in solar-thermal devices.
研究成果
The study successfully used the plasmon hybridisation model to control the absorption spectral range of fs-laser-treated metals, creating selective solar light absorbers and broadband light absorbers. W was identified as the best candidate for high-temperature selective solar absorption due to its high melting point and mechanical strength. The study demonstrated that fs-laser-treated surfaces can be used as high-temperature selective solar absorbers, significantly improving the efficiency of solar thermoelectric generation devices.
研究不足
The study notes that the ability to design and engineer properties is very limited as they originate from random structures with random sizes, geometries, and densities. Additionally, the durability of fs-laser-treated surfaces at high temperatures in ambient environments is questionable without protective coatings.
1：Experimental Design and Method Selection:
The study used the plasmon hybridisation model to guide the fabrication of fs-laser-treated light absorbers. The methodology involved controlling the size and density of randomly distributed nanostructures by adjusting fs-laser processing parameters.
2：Sample Selection and Data Sources:
Bulk circular disks of W, Al, Cu, and stainless steel with 99.99% purity were used as target materials. The samples were mounted on a computerised XYZ precision stage and translated at different speeds for broadband and selective absorbers.
3：99% purity were used as target materials. The samples were mounted on a computerised XYZ precision stage and translated at different speeds for broadband and selective absorbers.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: A Ti: sapphire fs-laser amplifier was used for laser fabrication. The laser was focused by a lens with a focal length of 20 cm. Physical vapour deposition of TiO2 was performed using an electron beam evaporator.
4：Experimental Procedures and Operational Workflow:
The laser processing parameters were adjusted to create selective solar absorbers and broadband absorbers. The samples were annealed at 500 °C for ten minutes to test their stability at high temperatures.
5：Data Analysis Methods:
The spectral reflectance/scattering was measured using an ultraviolet-visible spectrophotometer and Fourier transform infrared spectroscopy. The surface morphology was analyzed by SEM, and EDS was performed to study the presence of oxides and nitrides.
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