Optical Response Tailoring via Morphosynthesis of Ag@Au Nanoparticles
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 obta...
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MDPI AG
2025-07-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/15/14/1125 |
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| author | David Oswaldo Romero-Quitl Siva Kumar Krishnan Martha Alicia Palomino-Ovando Orlando Hernández-Cristobal José Concepción Torres-Guzmán Jesús Eduardo Lugo Miller Toledo-Solano |
| author_facet | David Oswaldo Romero-Quitl Siva Kumar Krishnan Martha Alicia Palomino-Ovando Orlando Hernández-Cristobal José Concepción Torres-Guzmán Jesús Eduardo Lugo Miller Toledo-Solano |
| author_sort | David Oswaldo Romero-Quitl |
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| description | 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. |
| format | Article |
| id | doaj-art-3b1d584d030640d1b9db65d102b64d4e |
| institution | DOAJ |
| issn | 2079-4991 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj-art-3b1d584d030640d1b9db65d102b64d4e2025-08-20T03:07:55ZengMDPI AGNanomaterials2079-49912025-07-011514112510.3390/nano15141125Optical Response Tailoring via Morphosynthesis of Ag@Au NanoparticlesDavid Oswaldo Romero-Quitl0Siva Kumar Krishnan1Martha Alicia Palomino-Ovando2Orlando Hernández-Cristobal3José Concepción Torres-Guzmán4Jesús Eduardo Lugo5Miller Toledo-Solano6Facultad de Ciencias Físico-Matemáticas, Benemérita Universidad Autónoma de Puebla, Av. San Claudio y Av. 18 Sur, Col. San Manuel, Ciudad Universitaria, Puebla Pue 72570, MexicoSECIHTI-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, MexicoFacultad de Ciencias Físico-Matemáticas, Benemérita Universidad Autónoma de Puebla, Av. San Claudio y Av. 18 Sur, Col. San Manuel, Ciudad Universitaria, Puebla Pue 72570, MexicoEscuela Nacional de Estudios Superiores, Universidad Nacional Autónoma de México, Antigua Carretera a Pátzcuaro 8701, Colonia San José de la Huerta, Morelia 58089, Michoacán, MexicoInstituto de Física “Ing. Luis Rivera Terrazas”, Benemérita Universidad Autónoma de Puebla, P.O. Box J-48, Puebla Pue 72570, MexicoFacultad de Ciencias Físico-Matemáticas, Benemérita Universidad Autónoma de Puebla, Av. San Claudio y Av. 18 Sur, Col. San Manuel, Ciudad Universitaria, Puebla Pue 72570, MexicoFacultad de Ciencias Físico-Matemáticas, Benemérita Universidad Autónoma de Puebla, Av. San Claudio y Av. 18 Sur, Col. San Manuel, Ciudad Universitaria, Puebla Pue 72570, MexicoWe 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.https://www.mdpi.com/2079-4991/15/14/1125gold@silver nanoparticlesseed-mediated chemical reductionMaxwell–Garnett theorymultilayer optical modeloptical properties |
| spellingShingle | David Oswaldo Romero-Quitl Siva Kumar Krishnan Martha Alicia Palomino-Ovando Orlando Hernández-Cristobal José Concepción Torres-Guzmán Jesús Eduardo Lugo Miller Toledo-Solano Optical Response Tailoring via Morphosynthesis of Ag@Au Nanoparticles Nanomaterials gold@silver nanoparticles seed-mediated chemical reduction Maxwell–Garnett theory multilayer optical model optical properties |
| title | Optical Response Tailoring via Morphosynthesis of Ag@Au Nanoparticles |
| title_full | Optical Response Tailoring via Morphosynthesis of Ag@Au Nanoparticles |
| title_fullStr | Optical Response Tailoring via Morphosynthesis of Ag@Au Nanoparticles |
| title_full_unstemmed | Optical Response Tailoring via Morphosynthesis of Ag@Au Nanoparticles |
| title_short | Optical Response Tailoring via Morphosynthesis of Ag@Au Nanoparticles |
| title_sort | optical response tailoring via morphosynthesis of ag au nanoparticles |
| topic | gold@silver nanoparticles seed-mediated chemical reduction Maxwell–Garnett theory multilayer optical model optical properties |
| url | https://www.mdpi.com/2079-4991/15/14/1125 |
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