In order to improve the analytical performance of surface-enhanced laser-induced breakdown spectroscopy (SENLIBS) on the elemental analysis of liquid samples, a 20 μm cylindric rod periodic micro-structure with 20 μm rod diameter, 15 μm rod height and 40 μm periodic length was successfully duplicated on the surface of a nickel substrate using electroplating method. The presence of periodic micro-structure on nickel surface changes the interaction of the laser and substrate; thus, plasma with higher temperature and higher electron density can be generated. The atomic emissions of both analytes and substrates' elements can be significantly enhanced in SENLIBS analysis if compared with that of using a flat substrate without any micro-structures. Mn, Pb, and Cr in aqueous solution samples were quantitatively analyzed by SENLIBS using these surface micro-structured nickel substrates. The detection limit of Mn, Pb, and Cr reached to 107.9 ng/mL, 76.0 ng/mL and 70.5 ng/mL under current experimental condition, respectively. In comparison with that obtained in similar analysis using flat nickel substrates, 4.2–5.1 folds improvement factors on the analytical sensitivity were achieved. This approach demonstrates a cost-effective and convenient method for the substrate preparation and provides a more sensitive elemental analysis of liquid samples by SENLIBS.

中文翻译：

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镍衬底表面周期性微观结构的复制及其在表面增强激光诱导击穿光谱中的应用


为了提高表面增强激光诱导击穿光谱 （SENLIBS） 对液体样品元素分析的分析性能，采用电镀方法在镍衬底表面成功复制了棒径为 20 μm、杆高为 15 μm、周期长度为 40 μm 的 20 μm 圆柱形棒周期性微结构。镍表面周期性微观结构的存在改变了激光器与衬底的相互作用;因此，可以产生具有更高温度和更高电子密度的等离子体。与使用没有任何微结构的平面基板相比，在 SENLIBS 分析中，分析物和衬底元素的原子发射都可以显着增强。使用这些表面微结构镍衬底，通过 SENLIBS 定量分析水溶液样品中的 Mn、Pb 和 Cr。在当前实验条件下，Mn、Pb 和 Cr 的检出限分别达到 107.9 ng/mL、76.0 ng/mL 和 70.5 ng/mL。与使用扁平镍衬底的类似分析相比，分析灵敏度提高了 4.2-5.1 倍。这种方法展示了一种经济高效且方便的底物制备方法，并通过 SENLIBS 对液体样品进行了更灵敏的元素分析。