Magnetic-plasmonic Ni@Au core-shell nanoparticle arrays and their SERS properties

Lu Wang, Zuobin Wang, Li Li, Jingran Zhang, Jinyun Liu, Jing Hu, Xiaomin Wu, Zhankun Weng, Xueying Chu, Jinhua Li, Zhongliang Qiao
2019 · doi:10.3762/bxiv.2019.120.v1
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Magnetic-plasmonic Ni@Au core-shell nanoparticle arrays fabricated by laser ablation and dewetting showed enhanced SERS properties due to improved local surface plasmon resonance.

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The paper studied fabrication and properties of large-area magnetic-plasmonic Ni@Au core–shell nanoparticle arrays created by direct laser interference ablation combined with thermal dewetting, with tunable Ni/Au composition. Magnetic characterization showed that Ni80@Au20 nanoparticles had higher saturation magnetization than nickel-only nanoparticles of the same diameter, and SERS testing using rhodamine 6G found an enhancement factor of 2.5×106 for Ni50@Au50 arrays, which was reported as 9-fold higher than Au nanoparticles with the same size distribution. The authors attributed the SERS performance to enhanced local surface plasmon resonance interactions between ferromagnetic Ni cores and polariton modes of Au shells. This paper is a preprint and not peer-reviewed, and it does not explicitly discuss endometriosis or adenomyosis; it was included in the corpus via a keyword match in the upstream search index.

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Abstract

In this paper, large-area magnetic-plasmonic Ni@Au core–shell nanoparticle arrays (NPAs) with tunable compositions were successfully fabricated by direct laser interference ablation (DLIA) incorporated with thermal dewetting method. The magnetic properties of the Ni@Au core–shell NPAs were analyzed and the saturation magnetization (M s ) of the Ni 80 @Au 20 nanoparticles was found higher than that of nickel-only nanoparticles with the same diameter. The surface enhanced Raman scattering (SERS) property of the Ni@Au core–shell NPAs was then examined using the Rhodamine 6G (R6G) as a Raman reporter molecule and a SERS enhancement factor of 2.5×10 6 was achieved on the Ni 50 @Au 50 NPA substrate, which was of 9 times higher than that for Au nanoparticles with the same size distribution. It was due to the enhanced local surface plasmon resonance (LSPR) between the ferromagnetic Ni cores and the surface polariton of Au shells of each nanoparticle. The fabrication of the Ni@Au core–shell NPAs with different compositions offers a new avenue to tailor the optical and magnetic properties of the nanostructured films for chemical and diagnostic applications.
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Materials

chemistry Medicinal and pharmaceutical chemistry Nano- and molecular-scale electronics Nano-biomaterials and bioscience Nanomagnetics Nanomaterials, thin films and nanointerfaces Nanomedicine Nanometrology and nanomechanics Nano-optics Nanopatterning, self-assembly and nanofabrication Nanostructures for energy and sensing applications Natural products chemistry Organo main group chemistry Other nanotechnology (unclassified) Other organic chemistry (unclassified) Photochemistry and photovoltaics Physical organic chemistry Supramolecular chemistry In this paper, large-area magnetic-plasmonic Ni@Au core–shell nanoparticle arrays (NPAs) with tunable compositions were successfully fabricated by direct laser interference ablation (DLIA) incorporated with thermal dewetting method. The magnetic properties of the Ni@Au core–shell NPAs were analyzed and the saturation magnetization (Ms) of the Ni80@Au20 nanoparticles was found higher than that of nickel-only nanoparticles with the same diameter. The surface enhanced Raman scattering (SERS) property of the Ni@Au core–shell NPAs was then examined using the Rhodamine 6G (R6G) as a Raman reporter molecule and a SERS enhancement factor of 2.5×106 was achieved on the Ni50@Au50 NPA substrate, which was of 9 times higher than that for Au nanoparticles with the same size distribution. It was due to the enhanced local surface plasmon resonance (LSPR) between the ferromagnetic Ni cores and the surface polariton of Au shells of each nanoparticle. The fabrication of the Ni@Au core–shell NPAs with different compositions offers a new avenue to tailor the optical and magnetic properties of the nanostructured films for chemical and diagnostic applications.

Keywords

surface enhanced Raman scattering; magnetic-plasmonic nanoparticles; core-shell nanoparticles; ferromagnetic nanoparticles. | Format: DOCX | Size: 3.3 MB | Download | When a peer-reviewed version of this preprint is available, this information will be updated in the information box above. If no peer-reviewed version is available, please cite this preprint using the following information: Wang, L.; Wang, Z.; Li, L.; Zhang, J.; Liu, J.; Hu, J.; Wu, X.; Weng, Z.; Chu, X.; Li, J.; Qiao, Z. Beilstein Arch. 2019, 2019120. doi:10.3762/bxiv.2019.120.v1 Citation data can be downloaded as file using the "Download" button or used for copy/paste from the text window below. Citation data in RIS format can be imported by all major citation management software, including EndNote, ProCite, RefWorks, and Zotero. © 2019 Wang et al.; licensee Beilstein-Institut. This is an Open Access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0). Please note that the reuse, redistribution and reproduction in particular requires that the authors and source are credited. The license is subject to the Beilstein Archives terms and conditions: (https://www.beilstein-archives.org/xiv/terms)

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