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Magnetic–plasmonic Ni@Au core–shell nanoparticle arrays and their SERS properties
RSC Advances ( IF 3.9 ) Pub Date : 2020-1-14 , DOI: 10.1039/c9ra10354f
Lu Wang 1, 2 , Zuobin Wang 1, 2 , Li Li 1, 2 , Jingran Zhang 1 , Jinyun Liu 3 , Jing Hu 1 , Xiaomin Wu 1 , Zhankun Weng 1, 2 , Xueying Chu 4 , Jinhua Li 4 , Zhongliang Qiao 5
Affiliation  

In this paper, large-area magnetic–plasmonic Ni@Au core–shell nanoparticle arrays (NPAs) with tunable compositions were successfully fabricated by a 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 to be higher than that of nickel-only nanoparticles with the same diameter. Using Rhodamine 6G (R6G) as a Raman reporter molecule, the surface enhanced Raman scattering (SERS) property of the Ni@Au core–shell NPAs with a grain size distribution of 48 ± 42 nm and a short-distance order of about 200 nm was examined. A SERS enhancement factor of 2.5 × 106 was realized on the Ni50@Au50 NPA substrate, which was 9 times higher than that for Au nanoparticles with the same size distribution. This was due to the enhanced local surface plasmon resonance (LSPR) between the ferromagnetic Ni cores and the surface polariton of the 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.

中文翻译:

磁性等离子体Ni@Au核壳纳米粒子阵列及其SERS特性

在本文中,通过直接激光干涉烧蚀(DLIA)结合热去湿方法成功制备了成分可调的大面积磁等离子体Ni@Au核壳纳米粒子阵列(NPA)。对Ni@Au核壳NPA的磁性能进行了分析,发现Ni 80 @Au 20纳米粒子的饱和磁化强度( M s )高于相同直径的纯镍纳米粒子。使用罗丹明6G(R6G)作为拉曼报告分子,观察了晶粒尺寸分布为48±42 nm、短程有序约为200 nm的Ni@Au核壳NPA的表面增强拉曼散射(SERS)特性被检查了。在Ni 50 @Au 50 NPA基底上实现了2.5×10 6的SERS增强因子,比相同尺寸分布的Au纳米粒子高9倍。这是由于每个纳米颗粒的铁磁镍核和金壳的表面极化子之间的局域表面等离子体共振(LSPR)增强。具有不同成分的 Ni@Au 核壳 NPA 的制造提供了一种新途径,可以为化学和诊断应用定制纳米结构薄膜的光学和磁性特性。
更新日期:2020-01-14
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