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首页> 外文期刊>Applied Surface Science >Superhydrophobic nanostructured copper substrate as sensitive SERS platform prepared by femtosecond laser pulses
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Superhydrophobic nanostructured copper substrate as sensitive SERS platform prepared by femtosecond laser pulses

机译：飞秒激光脉冲制备的超疏水纳米结构铜基底作为敏感的SERS平台

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摘要

The superhydrophobic surface is considered as an ideal alternative surface-enhanced Raman scattering (SERS) substrate for ultra-trace detection, due to its unique concentration capability for a highly diluted solution. However, the combination of superhydrophobic properties and plasmonic nanostructures which serve as SERS "hot spots" still remain a challenge. Here, we develop a simple top-down method to fabricate nanostructured superhydrophobic SERS (S-SERS) substrates by femtosecond laser pulses directly on copper (Cu) without additionally Au/Ag coating. The Cu nanostructures not only allow the surface to exhibit superhydrophobic property to concentrate the analyte, but also contribute to the field enhancement. Furthermore, in order to further enhance the Raman signal, Ag nanoparticles with certain consentrations were injected into the droplet before evaporation, by which a concentrated mixture of analyte and Ag nanoparticles can be formed after evaporation. The synergistic effects of Cu nanostructures and Ag nanoparticles make the S-SERS substrate a highly efficient SERS platform with a low detection limit of 10(-13) M, a good recyclability and a long service time of up to 2.5 months under ambient conditions, exhibiting an obvious improvement compared to those silver coating methods.
机译：超疏水表面被认为是用于超痕量检测的理想替代表面增强拉曼散射（SERS）底物，因为它具有高度稀释溶液的独特浓缩能力。然而，作为SERS“热点”的超疏水性能和等离子体纳米结构的结合仍然是一个挑战。在这里，我们开发了一种简单的自上而下的方法，可以通过飞秒激光脉冲直接在铜（Cu）上制造纳米结构的超疏水SERS（S-SERS）基板，而无需额外的Au / Ag涂层。 Cu纳米结构不仅允许表面表现出超疏水性质以浓缩分析物，而且有助于增强场强。此外，为了进一步增强拉曼信号，在蒸发之前将具有一定许可度的Ag纳米颗粒注入液滴中，由此可以在蒸发之后形成分析物和Ag纳米颗粒的浓缩混合物。铜纳米结构和银纳米颗粒的协同作用使S-SERS基底成为高效的SERS平台，在环境条件下的检出限低至10（-13）M，良好的可回收性和长达2.5个月的使用寿命，与那些镀银方法相比，具有明显的改进。

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