Self-assembled bimetallic plasmonic nanocavity substrate for supersensitive SERS

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology 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。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optics and Laser Technology 物理-光学

CiteScore

8.50

自引率

10.00%

发文量

1060

审稿时长

3.4 months

期刊介绍： Optics & Laser Technology aims to provide a vehicle for the publication of a broad range of high quality research and review papers in those fields of scientific and engineering research appertaining to the development and application of the technology of optics and lasers. Papers describing original work in these areas are submitted to rigorous refereeing prior to acceptance for publication. The scope of Optics & Laser Technology encompasses, but is not restricted to, the following areas: •development in all types of lasers •developments in optoelectronic devices and photonics •developments in new photonics and optical concepts •developments in conventional optics, optical instruments and components •techniques of optical metrology, including interferometry and optical fibre sensors •LIDAR and other non-contact optical measurement techniques, including optical methods in heat and fluid flow •applications of lasers to materials processing, optical NDT display (including holography) and optical communication •research and development in the field of laser safety including studies of hazards resulting from the applications of lasers (laser safety, hazards of laser fume) •developments in optical computing and optical information processing •developments in new optical materials •developments in new optical characterization methods and techniques •developments in quantum optics •developments in light assisted micro and nanofabrication methods and techniques •developments in nanophotonics and biophotonics •developments in imaging processing and systems