The rapid and selective identification of heavy metal ions is crucial for environmental water safety. In this study, a novel surface-enhanced Raman scattering (SERS)-active catcher was designed for Cu(II) detection using a hydrophobic hydroxyoxime-mediated plasmonic silver membrane (HOX@Ag-PVDF). Uniformly dispersed Ag nanoparticles (ca. 80 nm) and hydroxyoxime molecules were synchronously decorated on the skeleton of the polyvinylidene fluoride membrane via an in situ interfacial assembly strategy. HOX@Ag-PVDF shows excellent SERS activity (EF = 2.5 × 10⁷), high reproducibility (~8% RSD), and long-term stability (50 days) for detecting 4-nitrothiophenol (4-NTP). Moreover, HOX@Ag-PVDF can serve as a new platform for rapid and dry-free SERS detection of Cu(II) owing to its strong affinity and surface hydrophobicity. Cu(II) ions can be rapidly captured in 5 s and selectively recognized by SERS signals without interference from other metal ions. HOX@Ag-PVDF exhibits linear SERS response signals at low concentrations ranging from 10⁻⁶ to 10⁻¹⁰ mol/L Cu(II) (R² = 0.9893) with a low detection limit (LOD) of 52.0 pmol/L. This hydrophobic plasmonic membrane, with its simple sampling and rapid SERS response characteristics, provides ultrasensitive recognition and heavy metal detection for practical applications.

重金属离子的快速选择性鉴定对于环境水安全至关重要。在这项研究中，设计了一种新型表面增强拉曼散射 (SERS) 活性捕集器，用于使用疏水性羟肟介导的等离子体银膜 (HOX@Ag-PVDF) 检测 Cu(II)。均匀分散的银纳米颗粒（约 80 nm）和羟基肟分子通过原位界面组装策略同步装饰在聚偏二氟乙烯膜的骨架上。HOX@Ag-PVDF 表现出优异的 SERS 活性 (EF = 2.5 × 10 ⁷)、高重现性 (~8% RSD) 和长期稳定性 (50 天) 用于检测 4-硝基苯硫酚 (4-NTP)。此外，HOX@Ag-PVDF 具有很强的亲和力和表面疏水性，可以作为快速、无干燥 SERS 检测 Cu(II) 的新平台。Cu(II) 离子可在 5 s 内快速捕获并被 SERS 信号选择性识别，而不受其他金属离子的干扰。^{HOX@Ag-PVDF 在 10 -6}至 10 ^-10 mol/L Cu(II) (R ² = 0.9893) 的低浓度范围内表现出线性 SERS 响应信号，检测限 (LOD) 为 52.0 pmol/L。这种疏水等离子膜具有简单的采样和快速的 SERS 响应特性，为实际应用提供了超灵敏的识别和重金属检测。