Wei Zhuofan, Shan Xiaomu, Shi Jian, Xu Yuanze, Wang Sen, Jiang Shouzhen
Collaborative Innovation Center of Light Manipulations and Applicationsin, School of Physics and Electronics , Universities of Shandong, Shandong Normal University, Jinan, 250014, China.
Shandong Normal University, Jinan, 250014, China.
Mikrochim Acta. 2025 Jun 4;192(7):400. doi: 10.1007/s00604-025-07268-w.
A surface-enhanced Raman scattering (SERS) composite substrate based on the synergy between Au@ZIF-8 nanoparticles (NPs) and multilayer Au/AlO thin films (MLFs) was designed to achieve electromagnetic field enhancement by coupling localized surface plasmon resonance (LSPR) with bulk plasmon polariton (BPP). Surface plasmon polaritons (SPPs) in MLFs can couple to form BPP, which significantly enhance the localized electric field intensity within the Au@ZIF-8 (zeolitic imidazolate framework-8) nanogaps. Moreover, the electric field amplification increases progressively with the number of film layers. Within the Au@ZIF-8 core-shell structure, the ZIF-8 serves as a shell to control particle spacing (thereby preventing agglomeration) and concentrate probe molecules within electromagnetic field hotspots. The experimental results demonstrate detection limits of 8.6 × 10 M for rhodamine 6G (R6G) and 1.5 × 10 M for Crystal Violet (CV), representing a significant improvement compared with conventional SERS substrates. This study provides new insights into the synergistic mechanisms of SPP with LSPR, and demonstrates the potential applications of composite Raman substrates in ultrasensitive molecular detection.
设计了一种基于金@沸石咪唑酯骨架-8（ZIF-8）纳米颗粒（NPs）与多层金/氧化铝薄膜（MLFs）协同作用的表面增强拉曼散射（SERS）复合基底，通过将局域表面等离子体共振（LSPR）与体等离子体激元（BPP）耦合来实现电磁场增强。MLFs中的表面等离子体激元（SPPs）可以耦合形成BPP，这显著增强了金@ZIF-8（沸石咪唑酯骨架-8）纳米间隙内的局域电场强度。此外，电场放大倍数随着薄膜层数的增加而逐渐增大。在金@ZIF-8核壳结构中，ZIF-8作为壳层来控制颗粒间距（从而防止团聚）并将探针分子聚集在电磁场热点区域内。实验结果表明，罗丹明6G（R6G）的检测限为8.6×10⁻⁸ M，结晶紫（CV）的检测限为1.5×10⁻⁸ M，与传统SERS基底相比有显著提高。本研究为SPP与LSPR的协同机制提供了新的见解，并证明了复合拉曼基底在超灵敏分子检测中的潜在应用。
