研究目的
To investigate the influence of gold nanolayer coating on the continuous-wave laser ablation of a pure aluminum surface, focusing on the formation of uniform micro/nanostructures and their structural and optical features, with potential applications as selective solar absorbers.
研究成果
The research demonstrated that gold nanolayer coating effectively controls heat distribution and enables the formation of uniform micro/nanostructures on aluminum surfaces using low-power continuous-wave CO2 laser irradiation. Optimal results were achieved with a 40 nm gold coating, yielding high absorption (0.98), low emission (0.13), and a high ξ factor (7.53), making it suitable for selective solar absorbers. The method is innovative, fast, eco-friendly, and cost-effective for surface modification.
研究不足
The study was conducted in laboratory atmosphere, which may affect results compared to controlled environments. The use of a specific laser power and wavelength limits generalizability. The gold coating thicknesses were limited to 15, 30, and 40 nm, and the method may not be scalable for large surfaces. Potential areas for optimization include exploring other coating materials or laser parameters.
1：Experimental Design and Method Selection:
The study used a continuous-wave CO2 laser to irradiate pure aluminum samples coated with gold nanolayers of varying thicknesses (15, 30, 40 nm) to form micro/nanostructures. The laser was operated at 130 W power with a wavelength of 10.6 μm and a beam diameter of about 10 μm when focused. A magnetron sputtering method was used for gold coating, and a black carbon layer was applied via gas flame to enhance laser absorption. Irradiations were conducted in air for 3 minutes at multiple points on the sample surface.
2：6 μm and a beam diameter of about 10 μm when focused. A magnetron sputtering method was used for gold coating, and a black carbon layer was applied via gas flame to enhance laser absorption. Irradiations were conducted in air for 3 minutes at multiple points on the sample surface.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Commercial pure aluminum plates (Al-1050) were cut into 12×12×4 mm pieces, mechanically polished with 1500 grit SiC sandpaper, and cleaned with acetone and ethanol in ultrasonic baths. Gold coatings of 99.99% purity were applied with controlled thicknesses.
3：99% purity were applied with controlled thicknesses.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included a CO2 laser, magnetron sputter coater (Cool Sputter Coater, SCD 005, BAL-TEC), SEM and EDS (Philips-XL30), XRD (Asenware-AW-XDM300), modular spectrophotometer (Avantes with Avaspec 3648 spectrometer and Avalight DHS light source), FTIR (Jasco model 680 PLUS), ultrasonic baths, and materials such as acetone, ethanol, SiC sandpaper, and gold and carbon coatings.
4：Experimental Procedures and Operational Workflow:
Samples were prepared by polishing, cleaning, coating with gold via sputtering, applying black carbon layer, irradiating with laser, cooling, and re-cleaning before characterization. Characterization involved SEM and EDS for morphology and composition, XRD for structural analysis, spectrophotometry for optical absorption/reflection, and FTIR for infrared properties.
5：Data Analysis Methods:
Data from spectrophotometry and FTIR were analyzed using Ava soft 8 software and MATLAB for calculating absorption, emission coefficients, and ξ factor. XRD patterns were analyzed for peak shifts and intensities.
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