Self-assembled bimetallic plasmonic nanocavity substrate for supersensitive SERS

IF 5.4 3区材料科学 Q2 CHEMISTRY, PHYSICAL

ACS Applied Energy Materials Pub Date : 2024-09-21 DOI:10.1016/j.optlastec.2024.111827

Ling Liu, Tian Gao, Qingpeng Zhao, Zikang Xue, Yizhi Wu

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Abstract

Surface-enhanced Raman scattering (SERS) using noble metal complexes in nanomaterials has been extensively explored in many fields. Here, a novel bimetallic nanocavity SERS substrate of closely spaced Ag@Au core–shell nanoparticles combined with smooth gold films called metal particle-on-film nanocavity were prepared by physical deposition and chemical self-assemble.The limit of detection for rhodamine 6G (R6G) on the SERS substrate has been extended to an impressively low concentration of 10⁻¹⁰ M, with commendable sensitivity and uniformity, corresponding to an analytical enhancement factor of 2 × 10⁷. In addition, the bimetallic nanocavity SERS substrates combine the beneficial plasmon properties of Au and Ag. The Raman intensity of R6G on this bimetallic nanocavity substrate is more than 20 times that of only Ag nanoparticles. Our results of finite-different time-domain (FDTD) simulation and experiment show that such a nanocavity substrate supports strong plasmonic resonance which results in excellent SERS activity, high spatial homogeneity and chemical stability. This work provides an effective SERS substrate for imaging and detection in the chemical and biological fields.

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用于超灵敏 SERS 的自组装双金属质子纳米腔基底

利用纳米材料中的贵金属复合物进行表面增强拉曼散射（SERS）已在许多领域得到广泛探索。在这里，通过物理沉积和化学自组装，制备了一种新型的双金属纳米腔 SERS 基底，它由紧密间隔的 Ag@Au 核壳纳米粒子与光滑的金膜结合而成，被称为膜上金属颗粒纳米腔。此外，双金属纳米腔 SERS 基底结合了金和银的有益等离子体特性。在这种双金属纳米腔基底上，R6G 的拉曼强度是只有银纳米粒子的 20 多倍。我们的有限差分时域（FDTD）模拟和实验结果表明，这种纳米空腔基底支持强等离子体共振，因而具有出色的 SERS 活性、高空间均匀性和化学稳定性。这项工作为化学和生物领域的成像和检测提供了一种有效的 SERS 基底。

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来源期刊

ACS Applied Energy Materials Materials Science-Materials Chemistry

CiteScore

10.30

自引率

6.20%

发文量

1368

期刊介绍： ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.