Wang Qiuyun, Liu Yitong, Jiang Luyun, Chen Anmin, Han Jianhui, Jin Mingxing
Institute of Atomic and Molecular Physics, Jilin University, Changchun, 130012, China.
State Key Laboratory of Laser Propulsion & Application, Department of Aerospace Science and Technology, Space Engineering University, Beijing, 101416, China.
Anal Chim Acta. 2023 Feb 8;1241:340802. doi: 10.1016/j.aca.2023.340802. Epub 2023 Jan 4.
This study used a femtosecond laser to ablate a Cu sample, forming a micro/nanostructural layer on the surface. And the effect of this structural layer on nanosecond laser-induced breakdown spectroscopy (LIBS) was discussed. Firstly, the effect of the micro/nanostructural layer on the intensity of laser-induced Cu plasma spectra was investigated. The micro/nanostructure could significantly enhance the spectral intensity of the Cu plasma by 82.5 times at 13.3 mJ laser energy. Secondly, the Cu plasma temperature and electron density were calculated. The micro/nanostructures could significantly increase Cu plasma temperature and electron density. Finally, the effect of micro/nanostructure surface on the spectral intensities of Pb and Cr elements in water was investigated for LIBS analysis. It was found that the detection limit of Pb and Cr trace metal elements in water was 1.85 ng/mL and 0.51 ng/mL at a lower laser energy (13.3 mJ), which was significantly better than other LIBS methods reported so far. The results show that the micro/nanostructure enhanced LIBS is a more sensitive method for detecting trace metal elements in the water.
本研究使用飞秒激光烧蚀铜样品，在其表面形成微纳结构层，并讨论了该结构层对纳秒激光诱导击穿光谱（LIBS）的影响。首先，研究了微纳结构层对激光诱导铜等离子体光谱强度的影响。在激光能量为13.3 mJ时，微纳结构可使铜等离子体的光谱强度显著增强82.5倍。其次，计算了铜等离子体的温度和电子密度。微纳结构可显著提高铜等离子体的温度和电子密度。最后，研究了微纳结构表面对水中铅和铬元素光谱强度的影响，用于LIBS分析。发现在较低激光能量（13.3 mJ）下，水中铅和铬痕量金属元素的检测限分别为1.85 ng/mL和0.51 ng/mL，这明显优于目前报道的其他LIBS方法。结果表明，微纳结构增强LIBS是一种检测水中痕量金属元素更灵敏的方法。
