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通过银@金纳米粒子的形态合成来定制光学响应

Optical Response Tailoring via Morphosynthesis of Ag@Au Nanoparticles.

作者信息

Romero-Quitl David Oswaldo, Krishnan Siva Kumar, Palomino-Ovando Martha Alicia, Hernández-Cristobal Orlando, Torres-Guzmán José Concepción, Lugo Jesús Eduardo, Toledo-Solano Miller

机构信息

Facultad de Ciencias Físico-Matemáticas, Benemérita Universidad Autónoma de Puebla, Av. San Claudio y Av. 18 Sur, Col. San Manuel, Ciudad Universitaria, Puebla Pue 72570, Mexico.

SECIHTI-Instituto de Física "Ing. Luis Rivera Terrazas", Benemérita Universidad Autónoma de Puebla, Av. San Claudio y Blvd. 18 Sur, Col. San Manuel, Ciudad Universitaria, Puebla 72570, Mexico.

出版信息

Nanomaterials (Basel). 2025 Jul 19;15(14):1125. doi: 10.3390/nano15141125.

DOI:10.3390/nano15141125
PMID:40711244
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12299739/
Abstract

We present a simple method for customizing the optical characteristics of gold-core, silver-shell (Au@Ag) nanoparticles through controlled morphosynthesis via a seed-mediated chemical reduction approach. By systematically adjusting the concentration of cetyltrimethylammonium chloride (CTAC), we obtained precise control over both the thickness of the Ag shell and the particle shape, transitioning from spherical nanoparticles to distinctly defined nanocubes. Bright field and high-angle annular dark-field scanning transmission electron microscopy (BF-STEM and HAADF-STEM), and energy-dispersive X-ray spectroscopy (EDS) were employed to validate the structural and compositional changes. To link morphology with optical behavior, we utilized the Mie and Maxwell-Garnett theoretical models to simulate the dielectric response of the core-shell nanostructures, showing trends that align with experimental UV-visible absorption spectra. This research presents an easy and adjustable method for modifying the plasmonic properties of Ag@Au nanoparticles by varying their shape and shell, offering opportunities for advanced applications in sensing, photonics, and nanophotonics.

摘要

我们提出了一种简单的方法，通过种子介导的化学还原方法进行可控形态合成，来定制金核银壳（Au@Ag）纳米粒子的光学特性。通过系统地调节十六烷基三甲基氯化铵（CTAC）的浓度，我们实现了对银壳厚度和颗粒形状的精确控制，从球形纳米粒子转变为形状明确的纳米立方体。利用明场和高角度环形暗场扫描透射电子显微镜（BF-STEM和HAADF-STEM）以及能量色散X射线光谱（EDS）来验证结构和成分的变化。为了将形态与光学行为联系起来，我们利用米氏理论和麦克斯韦-加尼特理论模型来模拟核壳纳米结构的介电响应，结果显示出与实验紫外可见吸收光谱一致的趋势。本研究提出了一种通过改变形状和壳层来修饰Ag@Au纳米粒子等离子体特性的简便且可调节的方法，为传感、光子学和纳米光子学等先进应用提供了机会。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d92/12299739/c966ca4edfc6/nanomaterials-15-01125-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d92/12299739/45b8340023af/nanomaterials-15-01125-g0A1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d92/12299739/73506640cb43/nanomaterials-15-01125-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d92/12299739/88f268cc48d4/nanomaterials-15-01125-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d92/12299739/8973e6222b83/nanomaterials-15-01125-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d92/12299739/35cba51ea594/nanomaterials-15-01125-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d92/12299739/c966ca4edfc6/nanomaterials-15-01125-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d92/12299739/45b8340023af/nanomaterials-15-01125-g0A1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d92/12299739/73506640cb43/nanomaterials-15-01125-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d92/12299739/88f268cc48d4/nanomaterials-15-01125-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d92/12299739/8973e6222b83/nanomaterials-15-01125-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d92/12299739/35cba51ea594/nanomaterials-15-01125-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d92/12299739/c966ca4edfc6/nanomaterials-15-01125-g005.jpg

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本文引用的文献

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