Stable aggregated silver nanoparticle in water with strong and wavelength-tunable localized surface plasmon resonance for liquid-state SERS substrates

IF 5.2 2区化学 Q2 CHEMISTRY, PHYSICAL Journal of Molecular Liquids Pub Date : 2025-04-15 Epub Date: 2025-02-08 DOI:10.1016/j.molliq.2025.127113

Rongjing Hu , Chenyi Zeng , Jingwen Zhang , Jinhua Xu , Cheng Pan , Zhenyu Lin , Fengfu Fu , Yongqiang Dong

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Abstract

A simple method is developed for the direct synthesis of aggregated silver nanoparticles (a-AgNPs), which show strong and wavelength-tunable localized surface plasmon resonance (LSPR). Three a-AgNPs (532-a-AgNPs, 633-a-AgNPs and 787-a-AgNPs) exhibiting the maximum LSPR wavelength coinciding well with those of lasers commonly used in SERS detection (532, 633 and 785 nm) are obtained. Thus, the three a-AgNPs possess abundant plasmonic hotspots under the irradiation of corresponding laser. Moreover, the three a-AgNPs show robust stability in water, and can be developed into liquid substrates directly for SERS determination. All the three substrates (532-sub, 633-sub, and 787-sub) show excellent SERS activity to 4-mercaptobenzoic acid (4-MBA) due to the synergistic effect of strong electromagnetic enhancement (EM) and chemical enhancement (CM) effects. The obtained 787-sub is further applied for the determination of thiram in juices. The low detection limit of 10 ppb and outstanding recoveries of 91.75–109.92 % suggest substantially the reliability and practicality of the developed SERS substrates in food safety detection.

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液体SERS衬底中具有强波长可调局部表面等离子体共振的水中稳定聚集银纳米粒子

提出了一种直接合成聚合银纳米粒子（A - agnps）的简单方法，该方法具有强的、波长可调的局域表面等离子体共振（LSPR）。得到了3种a-AgNPs (532-a-AgNPs、633-a-AgNPs和787-a-AgNPs)，它们的最大LSPR波长与SERS检测常用激光器（532、633和785 nm）的最大LSPR波长吻合良好。因此，在相应的激光照射下，三种a-AgNPs具有丰富的等离子体热点。此外，这三种a-AgNPs在水中表现出强大的稳定性，可以直接制成液体底物用于SERS检测。这3种底物（532-sub、633-sub和787-sub）对4-巯基苯甲酸（4-MBA）表现出优异的SERS活性，这是由于强电磁增强（EM）和化学增强（CM）效应的协同作用。所得的787-sub进一步应用于果汁中硫的测定。低检出限为10 ppb，高回收率为91.75 ~ 109.92%，表明所开发的SERS底物在食品安全检测中的可靠性和实用性。

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来源期刊

Journal of Molecular Liquids 化学-物理：原子、分子和化学物理

CiteScore

10.30

自引率

16.70%

发文量

2597

审稿时长

78 days

期刊介绍： The journal includes papers in the following areas: – Simple organic liquids and mixtures – Ionic liquids – Surfactant solutions (including micelles and vesicles) and liquid interfaces – Colloidal solutions and nanoparticles – Thermotropic and lyotropic liquid crystals – Ferrofluids – Water, aqueous solutions and other hydrogen-bonded liquids – Lubricants, polymer solutions and melts – Molten metals and salts – Phase transitions and critical phenomena in liquids and confined fluids – Self assembly in complex liquids.– Biomolecules in solution The emphasis is on the molecular (or microscopic) understanding of particular liquids or liquid systems, especially concerning structure, dynamics and intermolecular forces. The experimental techniques used may include: – Conventional spectroscopy (mid-IR and far-IR, Raman, NMR, etc.) – Non-linear optics and time resolved spectroscopy (psec, fsec, asec, ISRS, etc.) – Light scattering (Rayleigh, Brillouin, PCS, etc.) – Dielectric relaxation – X-ray and neutron scattering and diffraction. Experimental studies, computer simulations (MD or MC) and analytical theory will be considered for publication; papers just reporting experimental results that do not contribute to the understanding of the fundamentals of molecular and ionic liquids will not be accepted. Only papers of a non-routine nature and advancing the field will be considered for publication.