Microplastics (MPs) pollution has become a focal point of global concern, as the widespread distribution of MPs in the environment poses a potential threat to ecosystems and human health. Despite surface-enhanced Raman scattering (SERS) being one of the most promising detection techniques, the “coffee ring effect” of MPs and their unique size scale make effective contact with SERS substrates challenging. Here, we propose a novel strategy for MPs detection by constructing a plasmonic metasurface at the liquid-liquid interface (LLI). The fluidic properties of LLI provide more flexibility for the uniform dispersion of MPs and the assembly of plasmonic arrays. MPs are captured and assembled on an atomic-level metasurface in a core-shell structure (AuNPs@MPs), providing abundant “hot spots” and additional volume-enhanced Raman effects. This results in enhanced electromagnetic field around MPs and increased enhancement factors, demonstrating high SERS sensitivity and uniformity. This sensing platform provides a new approach for trace detection of MPs and has been validated in practical matrix.

中文翻译：

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用于痕量微塑料检测的液-液界面等离子体阵列


微塑料（MPs）污染已成为全球关注的焦点，因为MPs在环境中的广泛分布对生态系统和人类健康构成潜在威胁。尽管表面增强拉曼散射 (SERS) 是最有前途的检测技术之一，但 MP 的“咖啡环效应”及其独特的尺寸尺度使得与 SERS 基底的有效接触具有挑战性。在这里，我们提出了一种通过在液-液界面（LLI）处构建等离子体超表面来检测MP的新策略。 LLI 的流体特性为 MP 的均匀分散和等离子体阵列的组装提供了更大的灵活性。 MPs 在核壳结构 (AuNPs@MPs) 的原子级超表面上被捕获和组装，提供丰富的“热点”和额外的体积增强拉曼效应。这导致 MP 周围的电磁场增强并增加增强因子，从而表现出高 SERS 灵敏度和均匀性。该传感平台为MP的痕量检测提供了一种新方法，并已在实际矩阵中得到验证。