Abstract An assessment of the feasibility of using modified surface enhanced Raman scattering substrates (Ag nanoparticles on indium‑tin-oxide glass) for quantitative nanoparticle-enhanced laser induced breakdown spectroscopy (NELIBS) was carried out. Substrates were prepared with different surface coverage from various nanoparticle sizes, and their laser ablation behaviour was tested in detail. It was found that use of those combinations are most beneficial in terms of the signal enhancement factor, which provide the shortest interparticle distances. With the application of 266 nm laser wavelength, long (ms-range) gate width, and optimized laser pulse energy, the best NELIBS signal enhancement was found to be about a factor of three. By using liquid sample deposition by spraying, which was found to provide an even distribution of liquid samples on the substrate surface, successful calibration for Mn, Zn and Cr was performed. The NELIBS signal repeatability from five repeated measurements was found to be comparable to that of LIBS (5–10% RSD). These observations indicate that the NELIBS signal enhancement approach can be used in quantitative analytical applications for liquid samples, if i) the substrate fabrication procedure has good repeatability, ii) surface coverage and nanoparticle size is tightly controlled, iii) a homogenous liquid sample deposition is achieved.

中文翻译：

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使用改性表面增强拉曼散射基底对液体样品进行纳米粒子增强 LIBS 光谱

摘要 对使用改性表面增强拉曼散射衬底（氧化铟锡玻璃上的银纳米粒子）进行定量纳米粒子增强激光诱导击穿光谱 (NELIBS) 的可行性进行了评估。用不同的纳米颗粒尺寸制备了具有不同表面覆盖率的基材，并详细测试了它们的激光烧蚀行为。发现使用这些组合在信号增强因子方面是最有益的，这提供了最短的粒子间距离。通过应用 266 nm 激光波长、长（ms 范围）栅极宽度和优化的激光脉冲能量，发现最佳 NELIBS 信号增强约为 3 倍。通过使用喷雾沉积液体样品，发现液体样品在基材表面上分布均匀，因此成功校准了 Mn、Zn 和 Cr。发现来自五次重复测量的 NELIBS 信号重复性与 LIBS 的信号重复性相当（5-10% RSD）。这些观察结果表明 NELIBS 信号增强方法可用于液体样品的定量分析应用，如果 i) 基板制造过程具有良好的可重复性，ii) 表面覆盖率和纳米颗粒尺寸受到严格控制，iii) 均匀的液体样品沉积是达到了。