Utilizing pillararenes as capping agents to stabilize copper nanoparticles for cost-effective and high-performance SERS application

IF 4.6 2区化学 Q1 SPECTROSCOPY Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy Pub Date : 2025-02-17 DOI:10.1016/j.saa.2025.125919

Yuanjie Teng , Yi Zhong , Pei Xu , Jie Li , Zaifa Pan , Tianyu Hu , Haibing Ji , Xingchen Zhang , Yantao Lou

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Abstract

Gold, silver, and copper nanoparticles (CuNPs) exhibit strong localized surface plasmon resonance (LSPR) effects at specific sizes, which can amplify the Raman signals of adsorbed molecules. However, despite the cost-effectiveness of CuNPs, their applications in surface-enhanced Raman spectroscopy (SERS) are limited due to their susceptibility to surface oxidation and particle aggregation. In this study, three distinct capping agents—pillararenes, polyvinylpyrrolidone, and sodium citrate—were employed to enhance particle dispersion, improve stability, and protect the CuNPs from oxidation and degradation. The synthesized CuNPs were thoroughly characterized using UV–Vis absorption spectroscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy and Raman spectroscopy. Results revealed that CuNPs capped with pillararenes demonstrated superior SERS enhancement effects when using 4-aminothiophenol as the probe molecule, achieving an enhancement factor of 3.7 × 10⁵. Furthermore, pillararene-capped CuNPs exhibited a broader linear range in SERS quantitative detection applications. This proposed method offers a versatile and cost-effective SERS substrate compared to commercial gold and silver nanocolloids, positioning it as a promising candidate for a wide range of SERS applications.

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利用柱状芳烯作为封盖剂稳定铜纳米颗粒，实现经济高效的SERS应用

金、银和铜纳米粒子（CuNPs）在特定尺寸下表现出强烈的局部表面等离子体共振（LSPR）效应，可以放大吸附分子的拉曼信号。然而，尽管CuNPs具有成本效益，但由于其对表面氧化和颗粒聚集的敏感性，其在表面增强拉曼光谱（SERS）中的应用受到限制。在这项研究中，三种不同的封盖剂——柱芳烃、聚乙烯吡咯烷酮和柠檬酸钠——被用来增强颗粒的分散性，提高稳定性，并保护CuNPs免受氧化和降解。利用紫外-可见吸收光谱、透射电子显微镜、能量色散x射线光谱和拉曼光谱对合成的CuNPs进行了表征。结果表明，以4-氨基噻吩为探针分子，柱芳烃封帽的CuNPs具有较好的SERS增强效果，增强因子为3.7 × 105。此外，柱芳纶封顶的CuNPs在SERS定量检测中表现出更宽的线性范围。与商业金和银纳米胶体相比，该方法提供了一种多功能且具有成本效益的SERS衬底，将其定位为广泛SERS应用的有前途的候选物。

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阿拉丁

ethanol

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4-ATP

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hydrazine hydrate

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PVP

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sodium citrate

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CuSO4·5H2O

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.