Spectral intensity and stability of surface-enhanced laser-induced breakdown spectroscopy of metallic microstructure
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摘要: 在金属铝表面用飞秒激光分别刻蚀了四种形状的微结构，对比分析了周期不同的矩形、圆形、三角形和六边形微结构对沉积在其表面Cr元素水溶液的表面增强激光诱导击穿光谱（LIBS）光谱强度和稳定性的影响。研究结果表明微结构的周期越小，光谱增强效果越显著，其中矩形微结构在相同周期下表现出最优光谱增强效果，相比于未处理的金属铝，其光谱强度增强了4倍左右。此外，六边形微结构的光谱稳定性最佳，具有良好的可重复性。研究结果为今后采用表面增强LIBS法检测水溶液中的重金属元素提供了一种可行的基底制备方法。Abstract: To enhance the performance of laser-induced breakdown spectroscopy (LIBS) for the analysis of element Cr in solutions, a surface-enhanced LIBS technique combining metallic microstructures is proposed. Initially, using femtosecond laser surface texturing technology, various shapes and cycles of microstructures including rectangles, circles, triangles, and hexagons were etched on the surface of metallic aluminum. Through comparative analysis, the effects of different microstructures on the surface-enhanced LIBS spectral intensity and stability of Cr-element aqueous solutions deposited on them were investigated. The results indicate that smaller microstructure cycles result in more significant spectral enhancement, with rectangular microstructures demonstrating the optimal spectral enhancement at the same period, increasing the spectral intensity by approximately four times compared to untreated metallic aluminum. Furthermore, hexagonal microstructures exhibit the best spectral stability and repeatability. These findings provide a viable method for substrate preparation for applying surface-enhanced LIBS techniques to the detection of heavy metal elements in aqueous solutions.
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图 4 铝表面的光学显微三维图
Figure 4. Optical microscopic three-dimensional images of aluminum surface
图 5 金属(铝)表面Cr元素LIBS光谱强度随微结构形状和周期的变化规律
Figure 5. Variation pattern of Cr element LIBS spectral intensity on the metal (aluminum) surface with different microstructure shapes and cycles
图 6 四种微结构铝表面下LIBS光谱的RSD随微结构周期的变化规律(铝)
Figure 6. Variation trend of RSD of LIBS spectra under the surface of aluminum with four different microstructures as a function of microstructure cycle (Al)
图 7 相同周期不同微结构形状铝表面干燥Cr元素的LIBS光谱强度图
Figure 7. LIBS spectral intensity of Cr elements on the surface of aluminum with different microstructural shapes but the same cycle under dry conditions
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