Fabrication of plasmonic Au-Ag alloy nanostars for ultrasensitive SERS detection

IF 4.3 2区化学 Q1 SPECTROSCOPY

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy Pub Date : 2025-04-12 DOI:10.1016/j.saa.2025.126208

Wen Liu , Jun Dong , Yuchong Ren , Wanting Zhou , Qingyan Han , Chengyun Zhang , Kaili Ren , Yongkai Wang , Wei Gao , Jianxia Qi

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Abstract

In this paper, Au-Ag alloy nanostar (Au-Ag NSt) substrates were prepared by liquid-liquid three-phase self-assembly method, and the influence of preparation conditions on their Raman activity of the substrate was explored. By adjusting the gold-silver ratios of alloy seeds and the concentration of AgNO₃ in the growth solution, it was found that the LSPR peak can be adjusted. Under the conditions of Au₁-Ag₃ nanoparticles as seeds and 200 μL AgNO₃ solution (2 mM) as epitaxial growth solution, the prepared Au₁-Ag₃ NSt substrate exhibits excellent SERS activity. The substrate can detect R6G and CV probe molecules with detection limits as low as 10⁻¹¹ M and 10⁻¹⁰ M, respectively. Experiments have confirmed that the substrate has the characteristics of high sensitivity, good uniformity and strong stability. In addition, the substrate can detect APM molecules far below the safety standard, which further proves that the structure has excellent practical application potential as a SERS substrate.

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用于超灵敏SERS检测的等离子体Au-Ag合金纳米星的制备

本文采用液-液三相自组装法制备了金-银合金纳米星（Au-Ag NSt）基底，并探讨了制备条件对基底拉曼活性的影响。通过调节合金种子的金银比例和生长液中 AgNO3 的浓度，发现可以调节 LSPR 峰值。在以 Au1-Ag3 纳米粒子为种子、200 μL AgNO3 溶液（2 mM）为外延生长液的条件下，制备的 Au1-Ag3 NSt 基底表现出优异的 SERS 活性。该基底可探测 R6G 和 CV 探针分子，探测限分别低至 10-11 M 和 10-10 M。实验证实，该基底具有灵敏度高、均匀性好和稳定性强等特点。此外，该基底还能检测到远低于安全标准的 APM 分子，这进一步证明了该结构作为 SERS 基底具有很好的实际应用潜力。

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

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 物理-光谱学

CiteScore

8.40

自引率

11.40%

发文量

1364

审稿时长

40 days

期刊介绍： Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy (SAA) is an interdisciplinary journal which spans from basic to applied aspects of optical spectroscopy in chemistry, medicine, biology, and materials science. The journal publishes original scientific papers that feature high-quality spectroscopic data and analysis. From the broad range of optical spectroscopies, the emphasis is on electronic, vibrational or rotational spectra of molecules, rather than on spectroscopy based on magnetic moments. Criteria for publication in SAA are novelty, uniqueness, and outstanding quality. Routine applications of spectroscopic techniques and computational methods are not appropriate. Topics of particular interest of Spectrochimica Acta Part A include, but are not limited to: Spectroscopy and dynamics of bioanalytical, biomedical, environmental, and atmospheric sciences, Novel experimental techniques or instrumentation for molecular spectroscopy, Novel theoretical and computational methods, Novel applications in photochemistry and photobiology, Novel interpretational approaches as well as advances in data analysis based on electronic or vibrational spectroscopy.